| V-4387 | High | Anonymous FTP accounts must not have a functional shell. | If an anonymous FTP account has been configured to use a functional shell, attackers could gain access to the shell if the account is compromised. |
| V-4249 | High | The system boot loader must require authentication. | If the system's boot loader does not require authentication, users with console access to the system may be able to alter the system boot configuration or boot the system into single user or... |
| V-4248 | High | For systems capable of using GRUB, the system must be configured with GRUB as the default boot loader unless another boot loader has been authorized, justified, and documented using site-defined procedures. | GRUB is a versatile boot loader used by several platforms that can provide authentication for access to the system or boot loader. |
| V-847 | High | The TFTP daemon must operate in "secure mode" which provides access only to a single directory on the host file system. | Secure mode limits TFTP requests to a specific directory. If TFTP is not running in secure mode, it may be able to write to any file or directory and may seriously impair system integrity,... |
| V-848 | High | The TFTP daemon must have mode 0755 or less permissive. | If TFTP runs with the setuid or setgid bit set, it may be able to write to any file or directory and may seriously impair system integrity, confidentiality, and availability. |
| V-922 | High | All shell files must have mode 0755 or less permissive. | Shells with world/group write permissions give the ability to maliciously modify the shell to obtain unauthorized access. |
| V-770 | High | The system must not have accounts configured with blank or null passwords. | If an account is configured for password authentication but does not have an assigned password, it may be possible to log into the account without authentication. If the root user is configured... |
| V-4342 | High | The x86 CTRL-ALT-DELETE key sequence must be disabled. | Undesirable reboots can occur if the CTRL-ALT-DELETE key sequence is not disabled. Such reboots may cause a loss of data or loss of access to critical information. |
| V-4295 | High | The SSH daemon must be configured to only use the SSHv2 protocol. | SSHv1 is not a DoD-approved protocol and has many well-known vulnerability exploits. Exploits of the SSH daemon could provide immediate root access to the system. |
| V-4268 | High | The system must not have special privilege accounts, such as shutdown and halt. | If special privilege accounts are compromised, the accounts could provide privileges to execute malicious commands on a system. |
| V-24386 | High | The telnet daemon must not be running. | The telnet daemon provides a typically unencrypted remote access service which does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user... |
| V-11940 | High | The operating system must be a supported release. | An operating system release is considered "supported" if the vendor continues to provide security patches for the product. With an unsupported release, it will not be possible to resolve security... |
| V-11988 | High | There must be no .rhosts, .shosts, hosts.equiv, or shosts.equiv files on the system. | The .rhosts, .shosts, hosts.equiv, and shosts.equiv files are used to configure host-based authentication for individual users or the system. Host-based authentication is not sufficient for... |
| V-4689 | High | The SMTP service must be an up-to-date version. | The SMTP service version on the system must be current to avoid exposing vulnerabilities present in unpatched versions. |
| V-4688 | High | The rexec daemon must not be running. | The rexecd process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-4687 | High | The rsh daemon must not be running. | The rshd process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-819 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.
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| V-818 | Medium | The audit system must be configured to audit login, logout, and session initiation. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-815 | Medium | The audit system must be configured to audit files and programs deleted by the user. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-814 | Medium | The audit system must be configured to audit failed attempts to access files and programs. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-813 | Medium | System audit logs must have mode 0640 or less permissive. | If a user can write to the audit logs, audit trails can be modified or destroyed and system intrusion may not be detected. System audit logs are those files generated from the audit system and do... |
| V-812 | Medium | System audit logs must be owned by root. | Failure to give ownership of system audit log files to root provides the designated owner and unauthorized users with the potential to access sensitive information. |
| V-763 | Medium | The Department of Defense (DoD) login banner must be displayed immediately prior to, or as part of, console login prompts. | Failure to display the logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized access to system resources. |
| V-12039 | Medium | The /etc/securetty file must be owned by root. | The securetty file contains the list of terminals permitting direct root logins. It must be protected from unauthorized modification. |
| V-22471 | Medium | The SSH public host key files must have mode 0644 or less permissive. | If a public host key file is modified by an unauthorized user, the SSH service may be compromised. |
| V-22470 | Medium | The SSH daemon must restrict login ability to specific users and/or groups. | Restricting SSH logins to a limited group of users, such as system administrators, prevents password-guessing and other SSH attacks from reaching system accounts and other accounts not authorized... |
| V-12030 | Medium | The system's access control program must be configured to grant or deny system access to specific hosts. | If the system's access control program is not configured with appropriate rules for allowing and denying access to system network resources, services may be accessible to unauthorized hosts. |
| V-22573 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS key file must have mode 0600 or less permissive. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized... |
| V-22571 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS key file must be owned by root. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22574 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS key file must not have an extended ACL. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-4385 | Medium | The system must not use .forward files. | The .forward file allows users to automatically forward mail to another system. Use of .forward files could allow the unauthorized forwarding of mail and could potentially create mail loops which... |
| V-978 | Medium | Crontab files must have mode 0600 or less permissive, and files in cron script directories must have mode 0700 or less permissive. | To protect the integrity of scheduled system jobs and prevent malicious modification to these jobs, crontab files must be secured. |
| V-979 | Medium | Cron and crontab directories must have mode 0755 or less permissive. | To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. |
| V-22375 | Medium | The audit system must alert the SA when the audit storage volume approaches its capacity. | An accurate and current audit trail is essential for maintaining a record of system activity. If the system fails, the SA must be notified and must take prompt action to correct the... |
| V-22505 | Medium | The /etc/news/passwd.nntp file must not have an extended ACL. | Extended ACLs may provide excessive permissions on the /etc/news/passwd.nntp file, which may permit unauthorized access or modification to the NNTP configuration. |
| V-22504 | Medium | The /etc/news/nnrp.access file must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the nnrp.access file may allow unauthorized modification which... |
| V-22503 | Medium | The /etc/news/hosts.nntp.nolimit file must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the hosts.nntp.nolimit file may allow unauthorized modification... |
| V-22502 | Medium | The /etc/news/incoming.conf file must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the "incoming.conf" file may allow unauthorized modification... |
| V-22501 | Medium | Samba must be configured to not allow guest access to shares. | Guest access to shares permits anonymous access and is not permitted. |
| V-22500 | Medium | Samba must be configured to use encrypted passwords. | Samba must be configured to protect authenticators. If Samba passwords are not encrypted for storage, plain-text user passwords may be read by those with access to the Samba password file. |
| V-928 | Medium | The Network File System (NFS) export configuration file must be owned by root. | Failure to give ownership of the NFS export configuration file to root provides the designated owner and possible unauthorized users with the potential to change system configuration which could... |
| V-23732 | Medium | The FTPS/FTP service on the system must be configured with the Department of Defense (DoD) login banner. | Failure to display the logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized access to system resources.
Note: SFTP and FTPS are encrypted... |
| V-22595 | Medium | The access.conf file must not have an extended ACL. | If the access permissions are more permissive than 0640, system security could be compromised. |
| V-22596 | Medium | The /etc/sysctl.conf file must not have an extended ACL. | The sysctl.conf file specifies the values for kernel parameters to be set on boot. These settings can affect the system's security. |
| V-29238 | Medium | The audit system must be configured to audit failed attempts to access files and programs. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29239 | Medium | The audit system must be configured to audit failed attempts to access files and programs. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29236 | Medium | The audit system must be configured to audit failed attempts to access files and programs. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29237 | Medium | The audit system must be configured to audit failed attempts to access files and programs. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-921 | Medium | All shell files must be owned by root or bin. | If shell files are owned by users other than root or bin, they could be modified by intruders or malicious users to perform unauthorized actions. |
| V-4336 | Medium | The /etc/sysctl.conf file must have mode 0600 or less permissive. | The sysctl.conf file specifies the values for kernel parameters to be set on boot. These settings can affect the system's security. |
| V-4335 | Medium | The /etc/sysctl.conf file must be group-owned by root. | The sysctl.conf file specifies the values for kernel parameters to be set on boot. These settings can affect the system's security. |
| V-4334 | Medium | The /etc/sysctl.conf file must be owned by root. | The sysctl.conf file specifies the values for kernel parameters to be set on boot. These settings can affect the system's security. |
| V-29281 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules - delete_module. | Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be used... |
| V-29284 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules - /sbin/insmod. | Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be used... |
| V-29286 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules -/sbin/modprobe. | Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be used... |
| V-29289 | Medium | Files in cron script directories must have mode 0700 or less permissive. | To protect the integrity of scheduled system jobs and prevent malicious modification to these jobs, crontab files must be secured. |
| V-29288 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules - /sbin/rmmod | Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be used... |
| V-22309 | Medium | The root account's home directory must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the unix permissions of the files. |
| V-22303 | Medium | The system must use a FIPS 140-2 approved cryptographic hashing algorithm for generating account password hashes. | Systems must employ cryptographic hashes for passwords using the SHA-2 family of algorithms or FIPS 140-2 approved successors. The use of unapproved algorithms may result in weak password hashes... |
| V-22302 | Medium | The system must enforce compliance of the entire password during authentification. | Some common password hashing schemes only process the first eight characters of a user's password, which reduces the effective strength of the password. |
| V-22305 | Medium | The system must require passwords contain at least one lowercase alphabetic character. | To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of complex passwords reduces the ability of attackers to successfully obtain... |
| V-22304 | Medium | The password hashes stored on the system must have been generated using a FIPS 140-2 approved cryptographic hashing algorithm. | Systems must employ cryptographic hashes for passwords using the SHA-2 family of algorithms or FIPS 140-2 approved successors. The use of unapproved algorithms may result in weak password hashes... |
| V-22307 | Medium | The system must prevent the use of dictionary words for passwords. | An easily guessable password provides an open door to any external or internal malicious intruder. Many computer compromises occur as the result of account name and password guessing. This is... |
| V-22306 | Medium | The system must require at least eight characters be changed between the old and new passwords during a password change. | To ensure password changes are effective in their goals, the system must ensure that old and new passwords have significant differences. Without significant changes, new passwords may be easily... |
| V-766 | Medium | The system must disable accounts after three consecutive unsuccessful login attempts. | Disabling accounts after a limited number of unsuccessful login attempts improves protection against password guessing attacks. |
| V-840 | Medium | The ftpusers file must exist. | The ftpusers file contains a list of accounts not allowed to use FTP to transfer files. If this file does not exist, then unauthorized accounts can utilize FTP. |
| V-811 | Medium | Auditing must be implemented. | Without auditing, individual system accesses cannot be tracked and malicious activity cannot be detected and traced back to an individual account. |
| V-842 | Medium | The ftpusers file must be owned by root. | If the file ftpusers is not owned by root, an unauthorized user may modify the file to allow unauthorized accounts to use FTP. |
| V-843 | Medium | The ftpusers file must have mode 0640 or less permissive. | Excessive permissions on the ftpusers file could permit unauthorized modification. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized users... |
| V-1059 | Medium | The smbpasswd file must have mode 0600 or less permissive. | If the smbpasswd file has a mode more permissive than 0600, the smbpasswd file may be maliciously accessed or modified, potentially resulting in the compromise of Samba accounts. |
| V-924 | Medium | Device files and directories must only be writable by users with a system account or as configured by the vendor. | System device files in writable directories could be modified, removed, or used by an unprivileged user to control system hardware. |
| V-1021 | Medium | The X server must have the correct options enabled. | Without the correct options enabled, the Xwindows system would be less secure and there would be no screen timeout. |
| V-1058 | Medium | The smbpasswd file must be group-owned by root. | If the smbpasswd file is not group-owned by root, the smbpasswd file may be maliciously accessed or modified, potentially resulting in the compromise of Samba accounts. |
| V-12040 | Medium | The /etc/securetty file must have mode 0600 or less permissive. | The securetty file contains the list of terminals permitting direct root logins. It must be protected from unauthorized modification. |
| V-22546 | Medium | The system must not have Teredo enabled. | Teredo is an IPv6 transition mechanism involving tunneling IPv6 packets encapsulated in IPv4 packets. Unauthorized tunneling may circumvent network security. |
| V-22472 | Medium | The SSH private host key files must have mode 0600 or less permissive. | If an unauthorized user obtains the private SSH host key file, the host could be impersonated. |
| V-22549 | Medium | The DHCP client must not send dynamic DNS updates. | Dynamic DNS updates transmit unencrypted information about a system including its name and address and should not be used unless needed. |
| V-1055 | Medium | The /etc/security/access.conf file must have mode 0640 or less permissive. | If the access permissions are more permissive than 0640, system security could be compromised. |
| V-22428 | Medium | The services file must not have an extended ACL. | The services file is critical to the proper operation of network services and must be protected from unauthorized modification. If the services file has an extended ACL, it may be possible for... |
| V-22429 | Medium | The portmap or rpcbind service must not be running unless needed. | The portmap and rpcbind services increase the attack surface of the system and should only be used when needed. The portmap or rpcbind services are used by a variety of services using Remote... |
| V-22398 | Medium | The at.deny file must be group-owned by root, bin, sys, or cron. | If the group owner of the at.deny file is not set to root, bin, sys, or cron, unauthorized users could be allowed to view or edit sensitive information contained within the file. Unauthorized... |
| V-22397 | Medium | The at.allow file must be group-owned by root, bin, sys, or cron. | If the group owner of the at.allow file is not set to root, bin, sys, or cron, unauthorized users could be allowed to view or edit the list of users permitted to run "at" jobs. Unauthorized... |
| V-22396 | Medium | The "at" directory must be group-owned by root, bin, sys, or cron. | If the group of the "at" directory is not root, bin, sys, or cron, unauthorized users could be allowed to view or edit files containing sensitive information within the directory. |
| V-1054 | Medium | The /etc/access.conf file must have a privileged group owner. | Depending on the access restrictions of the /etc/access.conf file, if the group owner were not a privileged group, it could endanger system security. |
| V-22394 | Medium | The cron.deny file must be group-owned by root, bin, or sys. | Cron daemon control files restrict the scheduling of automated tasks and must be protected. Unauthorized modification of the cron.deny file could result in Denial of Service to authorized cron... |
| V-22427 | Medium | The services file must be group-owned by root, bin, sys, or system. | Failure to give ownership of system configuration files to root or a system group provides the designated owner and unauthorized users with the potential to change the system configuration... |
| V-22392 | Medium | The at.deny file must have mode 0600 or less permissive. | The "at" daemon control files restrict access to scheduled job manipulation and must be protected. Unauthorized modification of the at.deny file could result in Denial of Service to authorized... |
| V-22426 | Medium | The xinetd.d directory must not have an extended ACL. | The Internet service daemon configuration files must be protected as malicious modification could cause Denial of Service or increase the attack surface of the system. |
| V-22390 | Medium | The at.allow file must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Unauthorized modification of the at.allow file could result in Denial of Service to... |
| V-22423 | Medium | The inetd.conf file, xinetd.conf file, and the xinetd.d directory must be group-owned by root, bin, sys, or system. | Failure to give ownership of sensitive files or utilities to system groups may provide unauthorized users with the potential to access sensitive information or change the system configuration... |
| V-22395 | Medium | The "at" directory must not have an extended ACL. | If the "at" directory has an extended ACL, unauthorized users could be allowed to view or to edit files containing sensitive information within the "at" directory. Unauthorized modifications... |
| V-11999 | Medium | The system must implement non-executable program stacks. | A common type of exploit is the stack buffer overflow. An application receives, from an attacker, more data than it is prepared for and stores this information on its stack, writing beyond the... |
| V-22572 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS key file must be group-owned by root, bin, or sys. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22391 | Medium | The cron.allow file must be group-owned by root, bin, sys, or cron. | If the group of the cron.allow is not set to root, bin, sys, or cron, the possibility exists for an unauthorized user to view or edit the list of users permitted to use cron. Unauthorized... |
| V-29272 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-11995 | Medium | Default system accounts (with the exception of root) must not be listed in the cron.allow file or must be included in the cron.deny file, if cron.allow does not exist. | To centralize the management of privileged account crontabs, of the default system accounts, only root may have a crontab. |
| V-29274 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29275 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29279 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-22491 | Medium | The system must not have IP forwarding for IPv6 enabled, unless the system is an IPv6 router. | If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices. |
| V-22492 | Medium | The Network File System (NFS) export configuration file must be group-owned by root, bin, sys, or system. | Failure to give group-ownership of the NFS export configuration file to root or a system group provides the designated group-owner and possible unauthorized users with the potential to change... |
| V-22497 | Medium | The /etc/smb.conf file must not have an extended ACL. | Excessive permissions could endanger the security of the Samba configuration file and, ultimately, the system and network. |
| V-22496 | Medium | All Network File System (NFS) exported system files and system directories must be group-owned by root, bin, sys, or system. | Failure to give group-ownership of sensitive files or directories to root provides the members of the owning group with the potential to access sensitive information or change system configuration... |
| V-22499 | Medium | Samba must be configured to use an authentication mechanism other than "share." | Samba share authentication does not provide for individual user identification and must not be used. |
| V-22498 | Medium | The /etc/smbpasswd file must not have an extended ACL. | If the permissions of the "smbpasswd" file are too permissive, it may be maliciously accessed or modified, potentially resulting in the compromise of Samba accounts. |
| V-4276 | Medium | The /etc/news/passwd.nntp file (or equivalent) must have mode 0600 or less permissive. | File permissions more permissive than 0600 for "/etc/news/passwd.nntp" may allow access to privileged information by system intruders or malicious users. |
| V-4275 | Medium | The /etc/news/readers.conf (or equivalent) must have mode 0600 or less permissive. | Excessive permissions on the readers.conf file may allow unauthorized modification which could lead to Denial of Service to authorized users or provide access to unauthorized users. |
| V-4278 | Medium | The files in /etc/news must be group-owned by root or news. | If critical system files do not have a privileged group-owner, system integrity could be compromised. |
| V-4370 | Medium | The traceroute command must be group-owned by sys, bin, root, or system. | If the group owner of the traceroute command has not been set to a system group, unauthorized users could have access to the command and use it to gain information regarding a network's topology... |
| V-22335 | Medium | The /etc/group file must be owned by root. | The /etc/group file is critical to system security and must be owned by a privileged user. The group file contains a list of system groups and associated information. |
| V-4090 | Medium | All system start-up files must be group-owned by root, sys, bin, other, or system. | If system start-up files do not have a group owner of root or a system group, the files may be modified by malicious users or intruders. |
| V-22444 | Medium | The ftpusers file must be group-owned by root, bin, sys, or system. | If the ftpusers file is not group-owned by root or a system group, an unauthorized user may modify the file to allow unauthorized accounts to use FTP. |
| V-22445 | Medium | The ftpusers file must not have an extended ACL. | Excessive permissions on the ftpusers file could permit unauthorized modification. Unauthorized modification could result in Denial of Service to authorized FTP users or permit unauthorized users... |
| V-808 | Medium | The system and user default umask must be 077. | The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a 4-digit... |
| V-778 | Medium | The system must prevent the root account from directly logging in except from the system console. | Limiting the root account direct logins to only system consoles protects the root account from direct unauthorized access from a non-console device. |
| V-800 | Medium | The /etc/shadow (or equivalent) file must have mode 0400. | The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which... |
| V-777 | Medium | The root account must not have world-writable directories in its executable search path. | If the root search path contains a world-writable directory, malicious software could be placed in the path by intruders and/or malicious users and inadvertently run by root with all of root's... |
| V-775 | Medium | The root account's home directory (other than /) must have mode 0700. | Permissions greater than 0700 could allow unauthorized users access to the root home directory. |
| V-773 | Medium | The root account must be the only account having a UID of 0. | If an account has a UID of 0, it has root authority. Multiple accounts with a UID of 0 afford more opportunity for potential intruders to guess a password for a privileged account.
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| V-22461 | Medium | The SSH client must be configured to only use FIPS 140-2 approved ciphers. | DoD information systems are required to use FIPS 140-2 approved ciphers. SSHv2 ciphers meeting this requirement are 3DES and AES. |
| V-22462 | Medium | The SSH client must be configured to not use Cipher-Block Chaining (CBC)-based ciphers. | The (CBC) mode of encryption as implemented in the SSHv2 protocol is vulnerable to chosen-plaintext attacks and must not be used.
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| V-22463 | Medium | The SSH client must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms. | DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. |
| V-981 | Medium | Cron and crontab directories must be group-owned by root, sys, bin or cron. | To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. Failure to give group-ownership of cron or crontab... |
| V-980 | Medium | Cron and crontab directories must be owned by root or bin. | Incorrect ownership of the cron or crontab directories could permit unauthorized users the ability to alter cron jobs and run automated jobs as privileged users. Failure to give ownership of cron... |
| V-983 | Medium | The cronlog file must have mode 0600 or less permissive. | Cron logs contain reports of scheduled system activities and must be protected from unauthorized access or manipulation.
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| V-982 | Medium | Cron logging must be implemented. | Cron logging can be used to trace the successful or unsuccessful execution of cron jobs. It can also be used to spot intrusions into the use of the cron facility by unauthorized and malicious users.
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| V-985 | Medium | The at.deny file must not be empty if it exists. | On some systems, if there is no at.allow file and there is an empty at.deny file, then the system assumes everyone has permission to use the "at" facility. This could create an insecure setting... |
| V-984 | Medium | Access to the "at" utility must be controlled via the at.allow and/or at.deny file(s). | The "at" facility selectively allows users to execute jobs at deferred times. It is usually used for one-time jobs. The at.allow file selectively allows access to the "at" facility. If there is... |
| V-987 | Medium | The at.allow file must have mode 0600 or less permissive. | Permissions more permissive than 0600 (read, write and execute for the owner) may allow unauthorized or malicious access to the at.allow and/or at.deny files. |
| V-22294 | Medium | The time synchronization configuration file (such as /etc/ntp.conf) must be owned by root. | A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. If an illicit time source is used for... |
| V-4394 | Medium | The /etc/syslog.conf file must be group-owned by root, bin, sys, or system. | If the group owner of /etc/syslog.conf is not root, bin, or sys, unauthorized users could be permitted to view, edit, or delete important system messages handled by the syslog facility. |
| V-4393 | Medium | The /etc/syslog.conf file must be owned by root. | If the /etc/syslog.conf file is not owned by root, unauthorized users could be allowed to view, edit, or delete important system messages handled by the syslog facility. |
| V-974 | Medium | Access to the cron utility must be controlled using the cron.allow and/or cron.deny file(s). | The cron facility allows users to execute recurring jobs on a regular and unattended basis. The cron.allow file designates accounts allowed to enter and execute jobs using the cron facility. If... |
| V-975 | Medium | The cron.allow file must have mode 0600 or less permissive. | A readable and/or writable cron.allow file by users other than root could allow potential intruders and malicious users to use the file contents to help discern information, such as who is allowed... |
| V-22349 | Medium | The /etc/gshadow file must not contain any group password hashes. | Group passwords are typically shared and should not be used. |
| V-22348 | Medium | The /etc/group file must not contain any group password hashes. | Group passwords are typically shared and should not be used. Additionally, if password hashes are readable by non-administrators, the passwords are subject to attack through lookup tables or... |
| V-22344 | Medium | The /etc/gshadow file must not have an extended ACL. | The /etc/gshadow file is critical to system security and must be protected from unauthorized modification. The /etc/gshadow file contains a list of system groups and hashes for group passwords. |
| V-22347 | Medium | The /etc/passwd file must not contain password hashes. | If password hashes are readable by non-administrators, the passwords are subject to attack through lookup tables or cryptographic weaknesses in the hashes. |
| V-22341 | Medium | The /etc/gshadow file must be owned by root. | The /etc/gshadow file is critical to system security and must be owned by a privileged user. The /etc/gshadow file contains a list of system groups and hashes for group passwords. |
| V-22340 | Medium | The /etc/shadow file must not have an extended ACL. | The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which... |
| V-22343 | Medium | The /etc/gshadow file must have mode 0400. | The /etc/gshadow file is critical to system security and must be protected from unauthorized modification. The /etc/gshadow file contains a list of system groups and hashes for group passwords. |
| V-22342 | Medium | The /etc/gshadow file must be group-owned by root. | The /etc/gshadow file is critical to system security and must be protected from unauthorized modification. The /etc/gshadow file contains a list of system groups and hashes for group passwords. |
| V-22514 | Medium | The Datagram Congestion Control Protocol (DCCP) must be disabled unless required. | The DCCP is a proposed transport layer protocol. This protocol is not yet widely used. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local... |
| V-22511 | Medium | The Stream Control Transmission Protocol (SCTP) must be disabled unless required. | The Stream Control Transmission Protocol (SCTP) is an Internet Engineering Task Force (IETF)-standardized transport layer protocol. This protocol is not yet widely used. Binding this protocol to... |
| V-12005 | Medium | Inetd and xinetd must be disabled or removed if no network services utilizing them are enabled. | Unnecessary services should be disabled to decrease the attack surface of the system. |
| V-12004 | Medium | The system must log informational authentication data. | Monitoring and recording successful and unsuccessful logins assists in tracking unauthorized access to the system. |
| V-12006 | Medium | The SMTP service HELP command must not be enabled. | The HELP command should be disabled to mask version information. The version of the SMTP service software could be used by attackers to target vulnerabilities present in specific software versions. |
| V-12002 | Medium | The system must not forward IPv4 source-routed packets. | Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security... |
| V-4084 | Medium | The system must prohibit the reuse of passwords within five iterations. | If a user, or root, used the same password continuously or was allowed to change it back shortly after being forced to change it to something else, it would provide a potential intruder with the... |
| V-4430 | Medium | The cron.deny file must be owned by root, bin, or sys. | Cron daemon control files restrict the scheduling of automated tasks and must be protected.
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| V-58537 | Medium | The SSH daemon must not allow host-based authentication. | SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. |
| V-941 | Medium | The system's access control program must log each system access attempt. | If access attempts are not logged, then multiple attempts to log on to the system by an unauthorized user may go undetected. |
| V-940 | Medium | The system must use an access control program. | Access control programs (such as TCP_WRAPPERS) provide the ability to enhance system security posture. |
| V-22702 | Medium | System audit logs must be group-owned by root, bin, sys, or system. | Sensitive system and user information could provide a malicious user with enough information to penetrate further into the system. |
| V-823 | Medium | The services file must be owned by root or bin. | Failure to give ownership of sensitive files or utilities to root or bin provides the designated owner and unauthorized users with the potential to access sensitive information or change the... |
| V-831 | Medium | The alias file must be owned by root. | If the alias file is not owned by root, an unauthorized user may modify the file adding aliases to run malicious code or redirect e-mail. |
| V-793 | Medium | Library files must have mode 0755 or less permissive. | Unauthorized access could destroy the integrity of the library files. |
| V-834 | Medium | Files executed through a mail aliases file must have mode 0755 or less permissive. | If a file executed through a mail aliases file has permissions greater than 0755, it can be modified by an unauthorized user and may contain malicious code or instructions potentially compromising... |
| V-931 | Medium | All Network File System (NFS) exported system files and system directories must be owned by root. | Failure to give ownership of sensitive files or directories to root provides the designated owner and possible unauthorized users with the potential to access sensitive information or change... |
| V-932 | Medium | The Network File System (NFS) anonymous UID and GID must be configured to values without permissions. | When an NFS server is configured to deny remote root access, a selected UID and GID are used to handle requests from the remote root user. The UID and GID should be chosen from the system to... |
| V-933 | Medium | The Network File System (NFS) server must be configured to restrict file system access to local hosts. | The NFS access option limits user access to the specified level. This assists in protecting exported file systems. If access is not restricted, unauthorized hosts may be able to access the... |
| V-935 | Medium | The Network File System (NFS) server must not allow remote root access. | If the NFS server allows root access to local file systems from remote hosts, this access could be used to compromise the system. |
| V-936 | Medium | The "nosuid" option must be enabled on all Network File System (NFS) client mounts. | Enabling the nosuid mount option prevents the system from granting owner or group-owner privileges to programs with the suid or sgid bit set. If the system does not restrict this access, users... |
| V-788 | Medium | All skeleton files (typically those in /etc/skel) must have mode 0644 or less permissive. | If the skeleton files are not protected, unauthorized personnel could change user startup parameters and possibly jeopardize user files.
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| V-22550 | Medium | The system must ignore IPv6 ICMP redirect messages. | ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An... |
| V-824 | Medium | The services file must have mode 0644 or less permissive. | The services file is critical to the proper operation of network services and must be protected from unauthorized modification. Unauthorized modification could result in the failure of network services. |
| V-22557 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS connection must require the server provide a certificate with a valid trust path to a trusted CA. | The NSS LDAP service provides user mappings which are a vital component of system security. Communication between an LDAP server and a host using LDAP for NSS require authentication. |
| V-22558 | Medium | If the system is using LDAP for authentication or account information, the system must verify the LDAP server's certificate has not been revoked. | LDAP can be used to provide user authentication and account information, which are vital to system security. Communication between an LDAP server and a host using LDAP requires authentication. |
| V-22559 | Medium | If the system is using LDAP for authentication or account information the /etc/ldap.conf (or equivalent) file must have mode 0644 or less permissive. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-11972 | Medium | The system must require passwords contain at least one numeric character. | To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of complex passwords reduces the ability of attackers to successfully obtain... |
| V-11973 | Medium | The system must require passwords contain at least one special character. | To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of complex passwords reduces the ability of attackers to successfully obtain... |
| V-11975 | Medium | The system must require passwords contain no more than three consecutive repeating characters. | To enforce the use of complex passwords, the number of consecutive repeating characters is limited. Passwords with excessive repeated characters may be more vulnerable to password-guessing attacks. |
| V-11976 | Medium | User passwords must be changed at least every 60 days. | Limiting the lifespan of authenticators limits the period of time an unauthorized user has access to the system while using compromised credentials and reduces the period of time available for... |
| V-22419 | Medium | The system must be configured to use TCP syncookies when experiencing a TCP SYN flood. | A TCP SYN flood attack can cause Denial of Service by filling a system's TCP connection table with connections in the SYN_RCVD state. Syncookies are a mechanism used to only track a connection... |
| V-22411 | Medium | The system must not respond to Internet Control Message Protocol (ICMP) timestamp requests sent to a broadcast address. | The processing of (ICMP) timestamp requests increases the attack surface of the system. Responding to broadcast ICMP timestamp requests facilitates network mapping and provides a vector for... |
| V-22410 | Medium | The system must not respond to Internet Control Message Protocol v4 (ICMPv4) echoes sent to a broadcast address. | Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
| V-22327 | Medium | The /etc/nsswitch.conf file must be owned by root. | The nsswitch.conf file (or equivalent) configures the source of a variety of system security information including account, group, and host lookups. Malicious changes could prevent the system... |
| V-22414 | Medium | The system must not accept source-routed IPv4 packets. | Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security... |
| V-22417 | Medium | The system must not send IPv4 Internet Control Message Protocol (ICMP) redirects. | ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table possibly... |
| V-22416 | Medium | The system must ignore IPv4 Internet Control Message Protocol (ICMP) redirect messages. | ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An... |
| V-22314 | Medium | All system command files must not have extended ACLs. | Restricting permissions will protect system command files from unauthorized modification. System command files include files present in directories used by the operating system for storing... |
| V-22315 | Medium | System log files must not have extended ACLs, except as needed to support authorized software. | If the system log files are not protected, unauthorized users could change the logged data, eliminating its forensic value. Authorized software may be given log file access through the use of... |
| V-22313 | Medium | All network services daemon files must not have extended ACLs. | Restricting permission on daemons will protect them from unauthorized modification and possible system compromise. |
| V-22310 | Medium | The root account's library search path must be the system default and must contain only absolute paths. | The library search path environment variable(s) contain a list of directories for the dynamic linker to search to find libraries. If this path includes the current working directory or other... |
| V-22311 | Medium | The root account's list of preloaded libraries must be empty. | The library preload list environment variable contains a list of libraries for the dynamic linker to load before loading the libraries required by the binary. If this list contains paths to... |
| V-22318 | Medium | NIS/NIS+/yp command files must not have extended ACLs. | NIS/NIS+/yp files are part of the system's identification and authentication processes and are critical to system security. ACLs on these files could result in unauthorized modification, which... |
| V-22319 | Medium | The /etc/resolv.conf file must be owned by root. | The resolv.conf (or equivalent) file configures the system's DNS resolver. DNS is used to resolve host names to IP addresses. If DNS configuration is modified maliciously, host name resolution... |
| V-27283 | Medium | The graphical desktop environment must set the idle timeout to no more than 15 minutes. | If graphical desktop sessions do not lock the session after 15 minutes of inactivity, requiring re-authentication to resume operations, the system or individual data could be compromised by an... |
| V-27284 | Medium | Graphical desktop environments provided by the system must have automatic lock enabled. | If graphical desktop sessions do not lock the session after 15 minutes of inactivity, requiring re-authentication to resume operations, the system or individual data could be compromised by an... |
| V-22438 | Medium | The aliases file must be group-owned by root, sys, bin, or system. | If the alias file is not group-owned by root or a system group, an unauthorized user may modify the file adding aliases to run malicious code or redirect e-mail. |
| V-29249 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29248 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-22436 | Medium | The hosts.lpd (or equivalent) file must not have an extended ACL. | Excessive permissions on the hosts.lpd (or equivalent) file may permit unauthorized modification. Unauthorized modifications could disrupt access to local printers from authorized remote hosts or... |
| V-29245 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29244 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29247 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29246 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29241 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29240 | Medium | The audit system must be configured to audit file deletions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29243 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29242 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-22488 | Medium | The SSH daemon must not allow compression or must only allow compression after successful authentication. | If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection,... |
| V-22489 | Medium | The SSH daemon must be configured with the Department of Defense (DoD) logon banner. | Failure to display the DoD logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized access to system resources.
The SSH service must be configured to... |
| V-22486 | Medium | The SSH daemon must use privilege separation. | SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section. |
| V-22487 | Medium | The SSH daemon must not allow rhosts RSA authentication. | If SSH permits rhosts RSA authentication, a user may be able to log in based on the keys of the host originating the request and not any user-specific authentication. |
| V-22485 | Medium | The SSH daemon must perform strict mode checking of home directory configuration files. | If other users have access to modify user-specific SSH configuration files, they may be able to log into the system as another user. |
| V-12023 | Medium | IP forwarding for IPv4 must not be enabled, unless the system is a router. | If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices. |
| V-4371 | Medium | The traceroute file must have mode 0700 or less permissive. | If the mode of the traceroute executable is more permissive than 0700, malicious code could be inserted by an attacker and triggered whenever the traceroute command is executed by authorized... |
| V-22323 | Medium | The /etc/hosts file must be owned by root. | The /etc/hosts file (or equivalent) configures local host name to IP address mappings that typically take precedence over DNS resolution. If this file is maliciously modified, it could cause the... |
| V-22563 | Medium | If the system is using LDAP for authentication or account information, the TLS certificate authority file and/or directory (as appropriate) must be owned by root. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-4089 | Medium | All system start-up files must be owned by root. | System start-up files not owned by root could lead to system compromise by allowing malicious users or applications to modify them for unauthorized purposes. This could lead to system and network... |
| V-867 | Medium | The Network Information System (NIS) protocol must not be used. | Due to numerous security vulnerabilities existing within NIS, it must not be used. Possible alternative directory services are NIS+ and LDAP. |
| V-4083 | Medium | Graphical desktop environments provided by the system must automatically lock after 15 minutes of inactivity and the system must require users to re-authenticate to unlock the environment.
Applications requiring continuous, real-time screen display (i.e., network management products) require the following and need to be documented with the IAO.
-The logon session does not have administrator rights.
-The display station (i.e., keyboard, monitor, etc.) is located in a controlled access area. | If graphical desktop sessions do not lock the session after 15 minutes of inactivity, requiring re-authentication to resume operations, the system or individual data could be compromised by an... |
| V-22321 | Medium | The /etc/resolv.conf file must have mode 0644 or less permissive. | The resolv.conf (or equivalent) file configures the system's DNS resolver. DNS is used to resolve host names to IP addresses. If DNS configuration is modified maliciously, host name resolution... |
| V-1029 | Medium | The /etc/smbpasswd file must be owned by root. | If the "smbpasswd" file is not owned by root, it may be maliciously accessed or modified, potentially resulting in the compromise of Samba accounts. |
| V-24384 | Medium | If the system is using LDAP for authentication or account information, the /etc/ldap.conf file (or equivalent) must not contain passwords. | The authentication of automated LDAP connections between systems must not use passwords since more secure methods are available, such as PKI and Kerberos. Additionally, the storage of unencrypted... |
| V-1025 | Medium | The /etc/access.conf file must be owned by root. | The /etc/access.conf file contains entries restricting access from the system console by authorized System Administrators. If the file is owned by a user other than root, it could compromise the system. |
| V-22456 | Medium | The SSH client must be configured to only use the SSHv2 protocol. | SSHv1 is not a DoD-approved protocol and has many well-known vulnerability exploits. Exploits of the SSH client could provide access to the system with the privileges of the user running the client. |
| V-1028 | Medium | The /etc/smb.conf file must have mode 0644 or less permissive. | If the "smb.conf" file has excessive permissions, the file may be maliciously modified and the Samba configuration could be compromised. |
| V-22458 | Medium | The SSH daemon must be configured to only use FIPS 140-2 approved ciphers. | DoD information systems are required to use FIPS 140-2 approved ciphers. SSHv2 ciphers meeting this requirement are 3DES and AES. |
| V-22329 | Medium | The /etc/nsswitch.conf file must have mode 0644 or less permissive. | The nsswitch.conf file (or equivalent) configures the source of a variety of system security information including account, group, and host lookups. Malicious changes could prevent the system... |
| V-22328 | Medium | The /etc/nsswitch.conf file must be group-owned by root, bin, or sys. | The nsswitch.conf file (or equivalent) configures the source of a variety of system security information including account, group, and host lookups. Malicious changes could prevent the system... |
| V-22455 | Medium | The system must use a remote syslog server (loghost). | A syslog server (loghost) receives syslog messages from one or more systems. This data can be used as an authoritative log source in the event a system is compromised and its local logs are suspect. |
| V-22326 | Medium | The /etc/hosts file must not have an extended ACL. | The /etc/hosts file (or equivalent) configures local host name to IP address mappings that typically take precedence over DNS resolution. If this file is maliciously modified, it could cause the... |
| V-22325 | Medium | The /etc/hosts file must have mode 0644 or less permissive. | The /etc/hosts file (or equivalent) configures local host name to IP address mappings that typically take precedence over DNS resolution. If this file is maliciously modified, it could cause the... |
| V-1027 | Medium | The /etc/smb.conf file must be owned by root. | The /etc/smb.conf file allows access to other machines on the network and grants permissions to certain users. If it is owned by another user, the file may be maliciously modified and the Samba... |
| V-22451 | Medium | The snmpd.conf file must be group-owned by root, bin, sys, or system. | The snmpd.conf file contains authenticators and must be protected from unauthorized access and modification. If the file is not group-owned by a system group, it may be subject to access and... |
| V-22322 | Medium | The /etc/resolv.conf file must not have an extended ACL. | The resolv.conf (or equivalent) file configures the system's DNS resolver. DNS is used to resolve host names to IP addresses. If DNS configuration is modified maliciously, host name resolution... |
| V-22453 | Medium | The /etc/syslog.conf file must have mode 0640 or less permissive. | Unauthorized users must not be allowed to access or modify the /etc/syslog.conf file. |
| V-1023 | Medium | The system must not run an Internet Network News (INN) server. | INN servers access Usenet newsfeeds and store newsgroup articles. INN servers use the Network News Transfer Protocol (NNTP) to transfer information from the Usenet to the server and from the... |
| V-1022 | Medium | An X server must have none of the following options enabled: -ac, -core (except for debugging purposes), or -nolock. | These options will detract from the security of the Xwindows system. |
| V-994 | Medium | The snmpd.conf file must have mode 0600 or less permissive. | The snmpd.conf file contains authenticators and must be protected from unauthorized access and modification. |
| V-995 | Medium | Management Information Base (MIB) files must have mode 0640 or less permissive. | The ability to read the MIB file could impart special knowledge to an intruder or malicious user about the ability to extract compromising information about the system or network. |
| V-22425 | Medium | The xinetd.d directory must have mode 0755 or less permissive. | The Internet service daemon configuration files must be protected as malicious modification could cause Denial of Service or increase the attack surface of the system. |
| V-901 | Medium | All user home directories must have mode 0750 or less permissive. | Excessive permissions on home directories allow unauthorized access to user files. |
| V-22358 | Medium | All skeleton files (typically in /etc/skel) must be group-owned by root, bin, sys, system, or other. | If the skeleton files are not protected, unauthorized personnel could change user startup parameters and possibly jeopardize user files. |
| V-906 | Medium | All run control scripts must have mode 0755 or less permissive. | If the startup files are writable by other users, they could modify the startup files to insert malicious commands into the startup files. |
| V-22357 | Medium | Skeleton files must not have extended ACLs. | If the skeleton files are not protected, unauthorized personnel could change user startup parameters and possibly jeopardize user files. |
| V-22355 | Medium | Run control scripts lists of preloaded libraries must contain only authorized paths. | The library preload list environment variable contains a list of libraries for the dynamic linker to load before loading the libraries required by the binary. If this list contains paths to... |
| V-22524 | Medium | The AppleTalk protocol must be disabled or not installed. | The AppleTalk suite of protocols is no longer in common use. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local processes may be able to... |
| V-12011 | Medium | All FTP users must have a default umask of 077. | The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask is stored as a 4-digit number, the first... |
| V-12019 | Medium | The snmpd.conf file must be owned by root. | The snmpd.conf file contains authenticators and must be protected from unauthorized access and modification. If the file is not owned by root, it may be subject to access and modification from... |
| V-4428 | Medium | All .rhosts, .shosts, .netrc, or hosts.equiv files must be accessible by only root or the owner. | If these files are accessible by users other than root or the owner, they could be used by a malicious user to set up a system compromise. |
| V-4358 | Medium | The cron.deny file must have mode 0600 or less permissive. | If file permissions for cron.deny are more permissive than 0600, sensitive information could be viewed or edited by unauthorized users.
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| V-4696 | Medium | The system must not have the UUCP service active. | The UUCP utility is designed to assist in transferring files, executing remote commands, and sending e-mail between UNIX systems over phone lines and direct connections between systems. The UUCP... |
| V-22424 | Medium | The inetd.conf and xinetd.conf files must not have extended ACLs. | The Internet service daemon configuration files must be protected as malicious modification could cause Denial of Service or increase the attack surface of the system. |
| V-822 | Medium | The xinetd configuration files must have mode 0640 or less permissive. | The Internet service daemon configuration files must be protected as malicious modification could cause Denial of Service or increase the attack surface of the system. |
| V-791 | Medium | The NIS/NIS+/yp command files must have mode 0755 or less permissive. | NIS/NIS+/yp files are part of the system's identification and authentication processes and are critical to system security. Unauthorized modification of these files could compromise these... |
| V-821 | Medium | The inetd.conf file, xinetd.conf file, and the xinetd.d directory must be owned by root or bin. | Failure to give ownership of sensitive files or utilities to root provides the designated owner and unauthorized users with the potential to access sensitive information or change the system... |
| V-794 | Medium | All system command files must have mode 0755 or less permissive. | Restricting permissions will protect system command files from unauthorized modification. System command files include files present in directories used by the operating system for storing... |
| V-795 | Medium | All system files, programs, and directories must be owned by a system account. | Restricting permissions will protect the files from unauthorized modification. |
| V-796 | Medium | System files, programs, and directories must be group-owned by a system group. | Restricting permissions will protect the files from unauthorized modification. |
| V-797 | Medium | The /etc/shadow (or equivalent) file must be owned by root. | The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. Failure to give ownership of sensitive files... |
| V-798 | Medium | The /etc/passwd file must have mode 0644 or less permissive. | If the passwd file is writable by a group-owner or the world, the risk of passwd file compromise is increased. The passwd file contains the list of accounts on the system and associated information. |
| V-828 | Medium | The hosts.lpd (or equivalent) file must be owned by root, bin, sys, or lp. | Failure to give ownership of the hosts.lpd file to root, bin, sys, or lp provides the designated owner, and possible unauthorized users, with the potential to modify the hosts.lpd file. ... |
| V-829 | Medium | The hosts.lpd (or equivalent) must have mode 0644 or less permissive. | Excessive permissions on the hosts.lpd (or equivalent) file may permit unauthorized modification. Unauthorized modifications could disrupt access to local printers from authorized remote hosts or... |
| V-22404 | Medium | Kernel core dumps must be disabled unless needed. | Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a considerable amount of disk space and may result in Denial of Service by... |
| V-22569 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS certificate file must have mode 0644 or less permissive. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22568 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS certificate file must be group-owned by root, bin, sys, or system. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22565 | Medium | If the system is using LDAP for authentication or account information, the TLS certificate authority file and/or directory (as appropriate) must have mode 0644 (0755 for directories) or less permissive. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22564 | Medium | If the system is using LDAP for authentication or account information, the TLS certificate authority file and/or directory (as appropriate) must be group-owned by root, bin, sys, or system. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification |
| V-22567 | Medium | For systems using NSS LDAP, the TLS certificate file must be owned by root. | The NSS LDAP service provides user mappings which are a vital component of system security. Its configuration must be protected from unauthorized modification. |
| V-22566 | Medium | If the system is using LDAP for authentication or account information, the LDAP TLS certificate authority file and/or directory (as appropriate) must not have an extended ACL. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22561 | Medium | If the system is using LDAP for authentication or account information, the /etc/ldap.conf (or equivalent) file must be group-owned by root, bin, sys, or system. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22560 | Medium | If the system is using LDAP for authentication or account information, the /etc/ldap.conf (or equivalent) file must be owned by root. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-22408 | Medium | Network interfaces must not be configured to allow user control. | Configuration of network interfaces should be limited to privileged users. Manipulation of network interfaces may result in a Denial of Service or bypass of network security mechanisms. |
| V-22562 | Medium | If the system is using LDAP for authentication or account information, the /etc/ldap.conf (or equivalent) file must not have an extended ACL. | LDAP can be used to provide user authentication and account information, which are vital to system security. The LDAP client configuration must be protected from unauthorized modification. |
| V-787 | Medium | System log files must have mode 0640 or less permissive. | If the system log files are not protected, unauthorized users could change the logged data, eliminating its forensic value. |
| V-832 | Medium | The alias file must have mode 0644 or less permissive. | Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect e-mail. |
| V-22365 | Medium | All shell files must be group-owned by root, bin, sys, or system. | If shell files are group-owned by users other than root or a system group, they could be modified by intruders or malicious users to perform unauthorized actions. |
| V-22369 | Medium | All system audit files must not have extended ACLs. | If a user can write to the audit logs, then audit trails can be modified or destroyed and system intrusion may not be detected. |
| V-1056 | Medium | The /etc/smb.conf file must be group-owned by root, bin, sys, or system. | If the group owner of the "smb.conf" file is not root or a system group, the file may be maliciously modified and the Samba configuration could be compromised. |
| V-837 | Medium | The SMTP service log file must be owned by root. | If the SMTP service log file is not owned by root, then unauthorized personnel may modify or delete the file to hide a system compromise. |
| V-22665 | Medium | The system must not be running any routing protocol daemons, unless the system is a router. | Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be... |
| V-23953 | Medium | The 'ldd' command must be disabled unless it protects against the execution of untrusted files. | The 'ldd' command provides a list of dependent libraries needed by a given binary, which is useful for troubleshooting software. Instead of parsing the binary file, some 'ldd' implementations... |
| V-23952 | Medium | Mail relaying must be restricted. | If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sending SPAM or other unauthorized activity. |
| V-29259 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-838 | Medium | The SMTP service log file must have mode 0644 or less permissive. | If the SMTP service log file is more permissive than 0644, unauthorized users may be allowed to change the log file. |
| V-29252 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29253 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29250 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29251 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29257 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-29255 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-11947 | Medium | The system must require passwords contain a minimum of 15 characters. | The use of longer passwords reduces the ability of attackers to successfully obtain valid passwords using guessing or exhaustive search techniques by increasing the password search space. |
| V-22421 | Medium | The system must not be configured for network bridging. | Some systems have the ability to bridge or switch frames (link-layer forwarding) between multiple interfaces. This can be useful in a variety of situations but, if enabled when not needed, has... |
| V-11948 | Medium | The system must require passwords contain at least one uppercase alphabetic character. | To enforce the use of complex passwords, minimum numbers of characters of different classes are mandated. The use of complex passwords reduces the ability of attackers to successfully obtain valid... |
| V-4250 | Medium | The system's boot loader configuration file(s) must have mode 0600 or less permissive. | File permissions greater than 0600 on boot loader configuration files could allow an unauthorized user to view or modify sensitive information pertaining to system boot instructions. |
| V-23741 | Medium | TCP backlog queue sizes must be set appropriately. | To provide some mitigation to TCP Denial of Service attacks, the TCP backlog queue sizes must be set to at least 1280 or in accordance with product-specific guidelines. |
| V-22587 | Medium | The system's boot loader configuration file(s) must be group-owned by root, bin, sys, or system. | The system's boot loader configuration files are critical to the integrity of the system and must be protected. Unauthorized modifications resulting from improper group ownership may compromise... |
| V-22586 | Medium | The system's boot loader configuration files must be owned by root. | The system's boot loader configuration files are critical to the integrity of the system and must be protected. Unauthorized modification of these files resulting from improper ownership could... |
| V-22585 | Medium | The system's boot loader configuration file(s) must not have extended ACLs. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. If extended ACLs are present on the system's boot loader configuration file(s), these... |
| V-22582 | Medium | The system must employ a local firewall. | A local firewall protects the system from exposing unnecessary or undocumented network services to the local enclave. If a system within the enclave is compromised, firewall protection on an... |
| V-22393 | Medium | The at.deny file must not have an extended ACL. | The "at" daemon control files restrict access to scheduled job manipulation and must be protected. Unauthorized modification of the at.deny file could result in Denial of Service to authorized... |
| V-776 | Medium | The root accounts executable search path must contain only authorized paths. | The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory... |
| V-4321 | Medium | The system must not run Samba unless needed. | Samba is a tool used for the sharing of files and printers between Windows and UNIX operating systems. It provides access to sensitive files and, therefore, poses a security risk if compromised. |
| V-756 | Medium | The system must require authentication upon booting into single-user and maintenance modes. | If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to... |
| V-24624 | Medium | The system boot loader must protect passwords using an MD5 or stronger cryptographic hash. | If system boot loader passwords are compromised, users with console access to the system may be able to alter the system boot configuration or boot the system into single user or maintenance mode,... |
| V-22460 | Medium | The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms. | DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. |
| V-22338 | Medium | The /etc/group file must not have an extended ACL. | The /etc/group file is critical to system security and must be protected from unauthorized modification. The group file contains a list of system groups and associated information. |
| V-22339 | Medium | The /etc/shadow file (or equivalent) must be group-owned by root, bin, or sys. | The /etc/shadow file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. The file also contains password hashes which... |
| V-22334 | Medium | The /etc/passwd file must not have an extended ACL. | File system ACLs can provide access to files beyond what is allowed by the mode numbers of the files. The /etc/passwd file contains the list of local system accounts. It is vital to system... |
| V-1032 | Medium | Users must not be able to change passwords more than once every 24 hours. | The ability to change passwords frequently facilitates users reusing the same password. This can result in users effectively never changing their passwords. This would be accomplished by users... |
| V-22336 | Medium | The /etc/group file must be group-owned by root, bin, or sys. | The /etc/group file is critical to system security and must be protected from unauthorized modification. The group file contains a list of system groups and associated information. |
| V-22337 | Medium | The /etc/group file must have mode 0644 or less permissive. | The /etc/group file is critical to system security and must be protected from unauthorized modification. The group file contains a list of system groups and associated information. |
| V-22330 | Medium | The /etc/nsswitch.conf file must not have an extended ACL. | The nsswitch.conf file (or equivalent) configures the source of a variety of system security information including account, group, and host lookups. Malicious changes could prevent the system... |
| V-22447 | Medium | The SNMP service must use only SNMPv3 or its successors. | SNMP Versions 1 and 2 are not considered secure. Without the strong authentication and privacy provided by the SNMP Version 3 User-based Security Model (USM), an attacker or other unauthorized... |
| V-22332 | Medium | The /etc/passwd file must be owned by root. | The /etc/passwd file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. |
| V-22333 | Medium | The /etc/passwd file must be group-owned by root, bin, or sys. | The /etc/passwd file contains the list of local system accounts. It is vital to system security and must be protected from unauthorized modification. |
| V-1061 | Medium | Audio devices must be group-owned by root, sys, bin, or system. | Without privileged group owners, audio devices will be vulnerable to being used as eaves-dropping devices by malicious users or intruders to possibly listen to conversations containing sensitive... |
| V-22415 | Medium | Proxy Address Resolution Protocol (Proxy ARP) must not be enabled on the system. | Proxy ARP allows a system to respond to ARP requests on one interface on behalf of hosts connected to another interface. If this function is enabled when not required, addressing information may... |
| V-913 | Medium | There must be no .netrc files on the system. | Unencrypted passwords for remote FTP servers may be stored in .netrc files. Policy requires passwords be encrypted in storage and not used in access scripts. |
| V-916 | Medium | The /etc/shells (or equivalent) file must exist. | The shells file (or equivalent) lists approved default shells. It helps provide layered defense to the security approach by ensuring users cannot change their default shell to an unauthorized... |
| V-22533 | Medium | The Transparent Inter-Process Communication (TIPC) protocol must be disabled or uninstalled. | The TIPC protocol is a relatively new cluster communications protocol developed by Ericsson. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged... |
| V-22530 | Medium | The Reliable Datagram Sockets (RDS) protocol must be disabled or not installed unless required. | The RDS protocol is a relatively new protocol developed by Oracle for communication between the nodes of a cluster. Binding this protocol to the network stack increases the attack surface of the... |
| V-22539 | Medium | The Bluetooth protocol handler must be disabled or not installed. | Bluetooth is a Personal Area Network (PAN) technology. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local processes may be able to cause the... |
| V-22383 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules. | Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be... |
| V-22385 | Medium | Crontab files must be group-owned by root, cron, or the crontab creator's primary group. | To protect the integrity of scheduled system jobs and prevent malicious modification to these jobs, crontab files must be secured. |
| V-22384 | Medium | The cron.allow file must not have an extended ACL. | A readable and/or writeable cron.allow file by other users than root could allow potential intruders and malicious users to use the file contents to help discern information, such as who is... |
| V-1048 | Medium | Audio devices must have mode 0660 or less permissive. | Audio and video devices that are globally accessible have proven to be another security hazard. There is software that can activate system microphones and video devices connected to user... |
| V-1049 | Medium | Audio devices must be owned by root. | Audio and video devices globally accessible have proven to be another security hazard. There is software that can activate system microphones and video devices connected to user workstations... |
| V-22437 | Medium | The traceroute file must not have an extended ACL. | If an extended ACL exists on the traceroute executable file, it may provide unauthorized users with access to the file. Malicious code could be inserted by an attacker and triggered whenever the... |
| V-1047 | Medium | The system must not permit root logins using remote access programs such as ssh. | Even though communications are encrypted, an additional layer of security may be gained by extending the policy of not logging directly on as root. In addition, logging in with a user-specific... |
| V-22435 | Medium | The hosts.lpd (or equivalent) file must be group-owned by lp. | Failure to give group-ownership of the hosts.lpd file to root, bin, sys, or system provides the members of the owning group and possible unauthorized users, with the potential to modify the... |
| V-22434 | Medium | The rexecd service must not be installed. | The rexecd process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-22433 | Medium | The rlogind service must not be installed. | The rlogind process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-22432 | Medium | The rlogind service must not be running. | The rlogind process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-22431 | Medium | The rshd service must not be installed. | The rshd process provides a typically unencrypted, host-authenticated remote access service. SSH should be used in place of this service. |
| V-22430 | Medium | The portmap or rpcbind service must not be installed unless needed. | The portmap and rpcbind services increase the attack surface of the system and should only be used when needed. The portmap or rpcbind services are used by a variety of services using Remote... |
| V-11989 | Medium | The .rhosts file must not be supported in PAM. | .rhosts files are used to specify a list of hosts permitted remote access to a particular account without authenticating. The use of such a mechanism defeats strong identification and... |
| V-11981 | Medium | All global initialization files must have mode 0644 or less permissive. | Global initialization files are used to configure the user's shell environment upon login. Malicious modification of these files could compromise accounts upon logon. |
| V-11983 | Medium | All global initialization files must be group-owned by root, sys, bin, other, system, or the system default. | Global initialization files are used to configure the user's shell environment upon login. Malicious modification of these files could compromise accounts upon logon. Failure to give ownership... |
| V-11982 | Medium | All global initialization files must be owned by root. | Global initialization files are used to configure the user's shell environment upon login. Malicious modification of these files could compromise accounts upon logon. Failure to give ownership... |
| V-11985 | Medium | All global initialization files executable search paths must contain only authorized paths. | The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory... |
| V-11984 | Medium | All skeleton files and directories (typically in /etc/skel) must be owned by root or bin. | If the skeleton files are not protected, unauthorized personnel could change user startup parameters and possibly jeopardize user files. Failure to give ownership of sensitive files or utilities... |
| V-11986 | Medium | All local initialization files executable search paths must contain only authorized paths. | The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory... |
| V-29261 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-22290 | Medium | The system clock must be synchronized continuously. | A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. Internal system clocks tend to drift and... |
| V-22297 | Medium | The time synchronization configuration file (such as /etc/ntp.conf) must not have an extended ACL. | A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. If an illicit time source is used for... |
| V-22296 | Medium | The time synchronization configuration file (such as /etc/ntp.conf) must have mode 0640 or less permissive. | A synchronized system clock is critical for the enforcement of time-based policies and the correlation of logs and audit records with other systems. If an illicit time source is used for... |
| V-789 | Medium | NIS/NIS+/yp files must be owned by root, sys, or bin. | NIS/NIS+/yp files are part of the system's identification and authentication processes and are critical to system security. Failure to give ownership of sensitive files or utilities to root or... |
| V-986 | Medium | Default system accounts (with the exception of root) must not be listed in the at.allow file or must be included in the at.deny file if the at.allow file does not exist. | Default accounts, such as bin, sys, adm, uucp, daemon, and others, should never have access to the "at" facility. This would create a possible vulnerability open to intruders or malicious users. |
| V-4368 | Medium | The at.deny file must be owned by root, bin, or sys. | If the owner of the at.deny file is not set to root, bin, or sys, unauthorized users could be allowed to view or edit sensitive information contained within the file. |
| V-4369 | Medium | The traceroute command owner must be root. | If the traceroute command owner has not been set to root, an unauthorized user could use this command to obtain knowledge of the network topology inside the firewall. This information may allow... |
| V-4364 | Medium | The "at" directory must have mode 0755 or less permissive. | If the "at" directory has a mode more permissive than 0755, unauthorized users could be allowed to view or to edit files containing sensitive information within the "at" directory. Unauthorized... |
| V-4367 | Medium | The at.allow file must be owned by root, bin, or sys. | If the owner of the at.allow file is not set to root, bin, or sys, unauthorized users could be allowed to view or edit sensitive information contained within the file. |
| V-4361 | Medium | The cron.allow file must be owned by root, bin, or sys. | If the owner of the cron.allow file is not set to root, bin, or sys, the possibility exists for an unauthorized user to view or to edit sensitive information. |
| V-27279 | Medium | The system must not have the unnecessary "ftp" account. | Accounts that provide no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system... |
| V-27276 | Medium | The system must not have the unnecessary "gopher" account. | Accounts that provide no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system... |
| V-27275 | Medium | The system must not have the unnecessary "news" account. | Accounts that provide no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system... |
| V-22454 | Medium | The /etc/syslog.conf file must not have an extended ACL. | Unauthorized users must not be allowed to access or modify the /etc/syslog.conf file. |
| V-22473 | Low | The SSH daemon must not permit GSSAPI authentication unless needed. | GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing... |
| V-22475 | Low | The SSH daemon must not permit Kerberos authentication unless needed. | Kerberos authentication for SSH is often implemented using GSSAPI. If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. ... |
| V-22474 | Low | The SSH client must not permit GSSAPI authentication unless needed. | GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system's GSSAPI to remote hosts, increasing... |
| V-22576 | Low | The system must use available memory address randomization techniques. | Successful exploitation of buffer overflow vulnerabilities relies in some measure to having a predictable address structure of the executing program. Address randomization techniques reduce the... |
| V-22577 | Low | Automated file system mounting tools must not be enabled unless needed. | Automated file system mounting tools may provide unprivileged users with the ability to access local media and network shares. If this access is not necessary for the system's operation, it must... |
| V-4384 | Low | The SMTP service's SMTP greeting must not provide version information. | The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version. |
| V-22370 | Low | System audit tool executables must be owned by root. | To prevent unauthorized access or manipulation of system audit logs, the tools for manipulating those logs must be protected. |
| V-22371 | Low | System audit tool executables must be group-owned by root, bin, sys, or system. | To prevent unauthorized access or manipulation of system audit logs, the tools for manipulating those logs must be protected. |
| V-22372 | Low | System audit tool executables must have mode 0750 or less permissive. | To prevent unauthorized access or manipulation of system audit logs, the tools for manipulating those logs must be protected. |
| V-22373 | Low | System audit tool executables must not have extended ACLs. | To prevent unauthorized access or manipulation of system audit logs, the tools for manipulating those logs must be protected. |
| V-22374 | Low | The audit system must alert the SA in the event of an audit processing failure. | An accurate and current audit trail is essential for maintaining a record of system activity. If the system fails, the SA must be notified and must take prompt action to correct the... |
| V-22376 | Low | The audit system must be configured to audit account creation. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises, and damages incurred during a system compromise. |
| V-22377 | Low | The audit system must be configured to audit account modification. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-22378 | Low | The audit system must be configured to audit account disabling. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-929 | Low | The Network File System (NFS) export configuration file must have mode 0644 or less permissive. | Excessive permissions on the NFS export configuration file could allow unauthorized modification of the file, which could result in Denial of Service to authorized NFS exports and the creation of... |
| V-23739 | Low | The system must use a separate file system for /tmp (or equivalent). | The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing. |
| V-23738 | Low | The system must use a separate file system for the system audit data path. | The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing. |
| V-23736 | Low | The system must use a separate file system for /var. | The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing. |
| V-22598 | Low | Auditing must be enabled at boot by setting a kernel parameter. | If auditing is enabled late in the boot process, the actions of startup scripts may not be audited. Some audit systems also maintain state information only available if auditing is enabled before... |
| V-22308 | Low | The system must restrict the ability to switch to the root user to members of a defined group. | Configuring a supplemental group for users permitted to switch to the root user prevents unauthorized users from accessing the root account, even with knowledge of the root credentials. |
| V-22579 | Low | The system must have USB Mass Storage disabled unless needed. | USB is a common computer peripheral interface. USB devices may include storage devices with the potential to install malicious software on a system or exfiltrate data |
| V-11996 | Low | Process core dumps must be disabled unless needed. | Process core dumps contain the memory in use by the process when it crashed. Process core dump files can be of significant size and their use can result in file systems filling to capacity, which... |
| V-11997 | Low | The kernel core dump data directory must be owned by root. | Kernel core dumps may contain the full contents of system memory at the time of the crash. As the system memory may contain sensitive information, it must be protected accordingly. If the kernel... |
| V-22422 | Low | All local file systems must employ journaling or another mechanism ensuring file system consistency. | File system journaling, or logging, can allow reconstruction of file system data after a system crash preserving the integrity of data that may have otherwise been lost. Journaling file systems... |
| V-24357 | Low | The system must be configured to send audit/system records to a remote audit server. | System/Audit records contain evidence that can be used in the investigation of compromised systems. To prevent this evidence from compromise, it must be sent to a separate system continuously.... |
| V-22493 | Low | The Network File System (NFS) exports configuration file must not have an extended ACL. | File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the NFS export configuration file could allow unauthorized... |
| V-774 | Low | The root user's home directory must not be the root directory (/). | Changing the root home directory to something other than / and assigning it a 0700 protection makes it more difficult for intruders to manipulate the system by reading the files root places in its... |
| V-1011 | Low | Inetd or xinetd logging/tracing must be enabled. | Inetd or xinetd logging and tracing allows the system administrators to observe the IP addresses connecting to their machines and what network services are being sought. This provides valuable... |
| V-22298 | Low | The system must limit users to 10 simultaneous system logins, or a site-defined number, in accordance with operational requirements. | Limiting simultaneous user logins can insulate the system from denial of service problems caused by excessive logins. Automated login processes operating improperly or maliciously may result in... |
| V-12003 | Low | A separate file system must be used for user home directories (such as /home or an equivalent). | The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing. |
| V-835 | Low | Sendmail logging must not be set to less than nine in the sendmail.cf file. | If Sendmail is not configured to log at level 9, system logs may not contain the information necessary for tracking unauthorized use of the sendmail service. |
| V-781 | Low | All GIDs referenced in the /etc/passwd file must be defined in the /etc/group file. | If a user is assigned the GID of a group not existing on the system, and a group with the GID is subsequently created, the user may have unintended rights to the group.
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| V-22418 | Low | The system must log martian packets. | Martian packets are packets containing addresses known by the system to be invalid. Logging these messages allows the SA to identify misconfigurations or attacks in progress. |
| V-1062 | Low | The root shell must be located in the / file system. | To ensure the root shell is available in repair and administrative modes, the root shell must be located in the / file system. |
| V-900 | Low | All interactive user home directories defined in the /etc/passwd file must exist. | If a user has a home directory defined that does not exist, the user may be given the / directory, by default, as the current working directory upon logon. This could create a Denial of Service... |
| V-22350 | Low | User home directories must not have extended ACLs. | Excessive permissions on home directories allow unauthorized access to user files. |
| V-4692 | Low | The SMTP service must not have the EXPN feature active. | The SMTP EXPN function allows an attacker to determine if an account exists on a system, providing significant assistance to a brute force attack on user accounts. EXPN may also provide additional... |
| V-4693 | Low | The SMTP service must not have the Verify (VRFY) feature active. | The VRFY command allows an attacker to determine if an account exists on a system, providing significant assistance to a brute force attack on user accounts. VRFY may provide additional... |
| V-899 | Low | All interactive users must be assigned a home directory in the /etc/passwd file. | If users do not have a valid home directory, there is no place for the storage and control of files they own. |
| V-22406 | Low | The kernel core dump data directory must have mode 0700 or less permissive. | Kernel core dumps may contain the full contents of system memory at the time of the crash. As the system memory may contain sensitive information, it must be protected accordingly. If the mode... |
| V-22405 | Low | The kernel core dump data directory must be group-owned by root, bin, sys, or system. | Kernel core dumps may contain the full contents of system memory at the time of the crash. As the system memory may contain sensitive information, it must be protected accordingly. If the kernel... |
| V-22584 | Low | The system must use a Linux Security Module configured to limit the privileges of system services. | Linux Security Modules such as SELinux and AppArmor can be used to provide protection from software exploits by explicitly defining the privileges permitted to each software package. |
| V-22580 | Low | The system must have IEEE 1394 (Firewire) disabled unless needed. | Firewire is a common computer peripheral interface. Firewire devices may include storage devices with the potential to install malicious software on a system or exfiltrate data. |
| V-22588 | Low | The system package management tool must cryptographically verify the authenticity of software packages during installation. | To prevent the installation of software from unauthorized sources, the system package management tool must use cryptographic algorithms to verify the packages are authentic. |
| V-22382 | Low | The audit system must be configured to audit account termination. | If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise. |
| V-825 | Low | Global initialization files must contain the "mesg -n" or "mesg n" commands. | If the "mesg -n" or "mesg n" command is not placed into the system profile, messaging can be used to cause a Denial of Service attack. |
