| V-216076 | High | X displays must not be exported to the world. | Open X displays allow an attacker to capture keystrokes and to execute commands remotely. Many users have their X Server set to xhost +, permitting access to the X Server by anyone, from anywhere. |
| V-219994 | High | The audit system must alert the System Administrator (SA) if there is any type of audit failure. | Proper alerts to system administrators and Information Assurance (IA) officials of audit failures ensure a timely response to critical system issues. |
| V-219996 | High | The operating system must configure auditing to reduce the likelihood of storage capacity being exceeded. | Overflowing the audit storage area can result in a denial of service or system outage. |
| V-216055 | High | The FTP daemon must not be installed unless required. | FTP is an insecure protocol. |
| V-216205 | 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-216056 | High | The TFTP service daemon must not be installed unless required. | TFTP is an insecure protocol. |
| V-216053 | High | The NIS package must not be installed. | NIS is an insecure protocol. |
| V-216118 | High | Login must not be permitted with empty/null passwords for SSH. | Permitting login without a password is inherently risky. |
| V-216220 | High | SNMP communities, users, and passphrases must be changed from the default. | Whether active or not, default SNMP passwords, users, and passphrases must be changed to maintain security. If the service is running with the default authenticators, then anyone can gather data... |
| V-216038 | High | The operating system must alert designated organizational officials in the event of an audit processing failure. | Proper alerts to system administrators and IA officials of audit failures ensure a timely response to critical system issues. |
| V-216057 | High | The telnet service daemon must not be installed unless required. | Telnet is an insecure protocol. |
| V-216184 | High | There must be no user .rhosts files. | Even though the .rhosts files are ineffective if support is disabled in /etc/pam.conf, they may have been brought over from other systems and could contain information useful to an attacker for... |
| V-216128 | High | The operating system must not allow logins for users with blank passwords. | If the password field is blank and the system does not enforce a policy that passwords are required, it could allow login without proper authentication of a user. |
| V-216122 | High | The system must not allow autologin capabilities from the GNOME desktop. | As automatic logins are a known security risk for other than "kiosk" types of systems, GNOME automatic login should be disabled in pam.conf. |
| V-216138 | Medium | The system must set strict multihoming. | These settings control whether a packet arriving on a non-forwarding interface can be accepted for an IP address that is not explicitly configured on that interface.
This rule is NA for... |
| V-216077 | Medium | .Xauthority or X*.hosts (or equivalent) file(s) must be used to restrict access to the X server. | If access to the X server is not restricted, a user's X session may be compromised. |
| V-216075 | Medium | The .Xauthority files must not have extended ACLs. | .Xauthority files ensure the user is authorized to access the specific X Windows host. Extended ACLs may permit unauthorized modification of these files, which could lead to Denial of Service to... |
| V-216074 | Medium | All .Xauthority files must have mode 0600 or less permissive. | .Xauthority files ensure the user is authorized to access the specific X Windows host. Excessive permissions may permit unauthorized modification of these files, which could lead to Denial of... |
| V-216073 | Medium | Any X Windows host must write .Xauthority files. | .Xauthority files ensure the user is authorized to access the specific X Windows host. If .Xauthority files are not used, it may be possible to obtain unauthorized access to the X Windows host. |
| V-216072 | Medium | System start-up files must only execute programs owned by a privileged UID or an application. | System start-up files executing programs owned by other than root (or another privileged user) or an application indicates the system may have been compromised. |
| V-216070 | 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-216174 | Medium | The operating system must use cryptographic mechanisms to protect and restrict access to information on portable digital media. | When data is written to portable digital media, such as thumb drives, floppy diskettes, compact disks, and magnetic tape, etc., there is risk of data loss.
An organizational assessment of risk... |
| V-216173 | Medium | The operating system must implement DoD-approved encryption to protect the confidentiality of remote access sessions. | Remote access is any access to an organizational information system by a user (or an information system) communicating through an external, non-organization-controlled network (e.g., the... |
| V-216079 | Medium | X Window System connections that are not required must be disabled. | If unauthorized clients are permitted access to the X server, a user's X session may be compromised. |
| V-216078 | Medium | The .Xauthority utility must only permit access to authorized hosts. | If unauthorized clients are permitted access to the X server, a user's X session may be compromised. |
| V-219988 | Medium | The audit system must support an audit reduction capability. | Using the audit system will utilize the audit reduction capability. Without an audit reduction capability, users find it difficult to identify specific patterns of attack. |
| V-219989 | Medium | The audit system records must be able to be used by a report generation capability. | Enabling the audit system will produce records for use in report generation. Without an audit reporting capability, users find it difficult to identify specific patterns of attack. |
| V-216048 | Medium | The operating system must protect audit tools from unauthorized modification. | Failure to maintain system configurations may result in privilege escalation. |
| V-216049 | Medium | The operating system must protect audit tools from unauthorized deletion. | Failure to maintain system configurations may result in privilege escalation. |
| V-216042 | Medium | The operating system must protect audit information from unauthorized access. | If audit data were to become compromised, then competent forensic analysis and discovery of the true source of potentially malicious system activity is difficult, if not impossible, to achieve.... |
| V-216041 | Medium | The operating system must shut down by default upon audit failure (unless availability is an overriding concern). | Continuing to operate a system without auditing working properly can result in undocumented access or system changes. |
| V-216047 | Medium | The operating system must protect audit tools from unauthorized access. | Failure to maintain system configurations may result in privilege escalation. |
| V-216045 | Medium | The System packages must be up to date with the most recent vendor updates and security fixes. | Failure to install security updates can provide openings for attack. |
| V-216163 | Medium | The operating system must prevent internal users from sending out packets which attempt to manipulate or spoof invalid IP addresses. | Manipulation of IP addresses can allow untrusted systems to appear as trusted hosts, bypassing firewall and other security mechanism and resulting in system penetration. |
| V-216162 | Medium | The operating system must terminate all sessions and network connections when nonlocal maintenance is completed. | Nonlocal maintenance and diagnostic activities are those activities conducted by individuals communicating through a network, either an external network (e.g., the internet) or an internal... |
| V-216165 | Medium | The operating system must use mechanisms for authentication to a cryptographic module meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for such authentication. | Encryption is only as good as the encryption modules utilized. Unapproved cryptographic module algorithms cannot be verified, and cannot be relied upon to provide confidentiality or integrity, and... |
| V-216164 | Medium | Wireless network adapters must be disabled. | The use of wireless networking can introduce many different attack vectors into the organization’s network. Common attack vectors such as malicious association and ad hoc networks will allow an... |
| V-216071 | Medium | All system start-up files must be group-owned by root, sys, or bin. | 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-219991 | Medium | The audit system must be configured to audit all discretionary access control permission modifications. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-219990 | Medium | The operating system must support the capability to compile audit records from multiple components within the system into a system-wide (logical or physical) audit trail that is time-correlated to within organization-defined level of tolerance. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account.
Without accurate time stamps, source, user, and... |
| V-219993 | Medium | The audit system must alert the SA when the audit storage volume approaches its capacity. | Filling the audit storage area can result in a denial of service or system outage and can lead to events going undetected. |
| V-219992 | Medium | The audit system must be configured to audit the loading and unloading of dynamic kernel modules. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-219995 | Medium | The operating system must allocate audit record storage capacity. | Proper audit storage capacity is crucial to ensuring the ongoing logging of critical events. |
| V-219997 | Medium | The system must verify that package updates are digitally signed. | Digitally signed packages ensure that the source of the package can be identified. |
| V-219999 | Medium | The operating system must employ automated mechanisms to prevent program execution in accordance with the organization-defined specifications. | Operating systems are capable of providing a wide variety of functions and services. Execution must be disabled based on organization-defined specifications. |
| V-219998 | Medium | The operating system must employ automated mechanisms, per organization-defined frequency, to detect the addition of unauthorized components/devices into the operating system. | Addition of unauthorized code or packages may result in data corruption or theft. |
| V-220014 | Medium | The operating system must synchronize internal information system clocks with a server that is synchronized to one of the redundant United States Naval Observatory (USNO) time servers or a time server designated for the appropriate DOD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS). | To assure the accuracy of the system clock, it must be synchronized with an authoritative time source within DOD. Many system functions, including time-based login and activity restrictions,... |
| V-220015 | Medium | The operating system must verify the correct operation of security functions in accordance with organization-defined conditions and in accordance with organization-defined frequency (if periodic verification). | Security functional testing involves testing the operating system for conformance to the operating system security function specifications, as well as for the underlying security model. The need... |
| V-220012 | Medium | The operating system must protect the integrity of transmitted information. | Ensuring the integrity of transmitted information requires the operating system take feasible measures to employ transmission layer security. This requirement applies to communications across... |
| V-220013 | Medium | The operating system must protect the audit records resulting from non-local accesses to privileged accounts and the execution of privileged functions. | Protection of audit records and audit data is of critical importance. Care must be taken to ensure privileged users cannot circumvent audit protections put in place. Auditing might not be reliable... |
| V-216011 | Medium | The audit system must produce records containing sufficient information to establish the identity of any user/subject associated with the event. | Enabling the audit system will produce records with accurate time stamps, source, user, and activity information. Without this information malicious activity cannot be accurately tracked. |
| V-216059 | Medium | The rpcbind service must be configured for local only services unless organizationally defined. | 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-216206 | 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-216201 | Medium | The root account must be the only account with GID of 0. | All accounts with a GID of 0 have root group privileges and must be limited to the group account only. |
| V-216052 | Medium | The legacy remote network access utilities daemons must not be installed. | Legacy remote access utilities allow remote control of a system without proper authentication. |
| V-216114 | Medium | X11 forwarding for SSH must be disabled. | As enabling X11 Forwarding on the host can permit a malicious user to secretly open another X11 connection to another remote client during the session and perform unobtrusive activities such as... |
| V-216116 | Medium | The rhost-based authentication for SSH must be disabled. | Setting this parameter forces users to enter a password when authenticating with SSH. |
| V-216117 | Medium | Direct root account login must not be permitted for SSH access. | The system should not allow users to log in as the root user directly, as audited actions would be non-attributable to a specific user. |
| V-216112 | Medium | Login services for serial ports must be disabled. | Login services should not be enabled on any serial ports that are not strictly required to support the mission of the system. This action can be safely performed even when console access is... |
| V-216113 | Medium | The nobody access for RPC encryption key storage service must be disabled. | If login by the user "nobody" is allowed for secure RPC, there is an increased risk of system compromise. If keyserv holds a private key for the "nobody" user, it will be used by... |
| V-220007 | Medium | The operating system must protect the confidentiality of transmitted information. | Ensuring the confidentiality of transmitted information requires the operating system take feasible measures to employ transmission layer security. This requirement applies to communications... |
| V-220006 | Medium | The operating system must maintain the integrity of information during aggregation, packaging, and transformation in preparation for transmission. | Ensuring the integrity of transmitted information requires the operating system take feasible measures to employ transmission layer security. This requirement applies to communications across... |
| V-220005 | Medium | The operating system must employ cryptographic mechanisms to recognize changes to information during transmission unless otherwise protected by alternative physical measures. | Ensuring that transmitted information is not altered during transmission requires the operating system take feasible measures to employ transmission layer security. This requirement applies to... |
| V-220004 | Medium | The operating system must protect the integrity of transmitted information. | Ensuring the integrity of transmitted information requires the operating system take feasible measures to employ transmission layer security. This requirement applies to communications across... |
| V-220003 | Medium | The operating system must employ FIPS-validate or NSA-approved cryptography to implement digital signatures. | FIPS 140-2 is the current standard for validating cryptographic modules, and NSA Type-X (where X=1, 2, 3, 4) products are NSA-certified hardware based encryption modules. |
| V-220001 | Medium | The system must restrict the ability of users to assume excessive privileges to members of a defined group and prevent unauthorized users from accessing administrative tools. | Allowing any user to elevate their privileges can allow them excessive control of the system tools. |
| V-220000 | Medium | The operating system must disable information system functionality that provides the capability for automatic execution of code on mobile devices without user direction. | Mobile devices include portable storage media (e.g., USB memory sticks, external hard disk drives) and portable computing and communications devices with information storage capability (e.g.,... |
| V-220009 | Medium | The operating system must maintain the confidentiality of information during aggregation, packaging, and transformation in preparation for transmission. | Ensuring that transmitted information remains confidential during aggregation, packaging, and transformation requires the operating system take feasible measures to employ transmission layer... |
| V-220008 | Medium | The operating system must employ cryptographic mechanisms to prevent unauthorized disclosure of information during transmission unless otherwise protected by alternative physical measures. | Ensuring that transmitted information does not become disclosed to unauthorized entities requires the operating system take feasible measures to employ transmission layer security. This... |
| V-216219 | Medium | The operating system must implement transaction recovery for transaction-based systems. | Recovery and reconstitution constitutes executing an operating system contingency plan comprised of activities to restore essential missions and business functions.
Transaction rollback and... |
| V-216216 | Medium | 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 of... |
| V-216215 | Medium | The kernel core dump data directory must be group-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-216214 | Medium | 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-216213 | 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-216212 | Medium | The centralized process core dump data directory must have mode 0700 or less permissive. | Process core dumps contain the memory in use by the process when it crashed. Any data the process was handling may be contained in the core file, and it must be protected accordingly. If the... |
| V-216211 | Medium | The centralized process core dump data directory must be group-owned by root, bin, or sys. | Process core dumps contain the memory in use by the process when it crashed. Any data the process was handling may be contained in the core file, and it must be protected accordingly. If the... |
| V-216210 | Medium | The centralized process core dump data directory must be owned by root. | Process core dumps contain the memory in use by the process when it crashed. Any data the process was handling may be contained in the core file, and it must be protected accordingly. If the... |
| V-216028 | Medium | The operating system must ensure unauthorized, security-relevant configuration changes detected are tracked. | Without auditing, malicious activity cannot be detected. |
| V-216029 | Medium | The audit system must be configured to audit all administrative, privileged, and security actions. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-216105 | Medium | The operating system must require individuals to be authenticated with an individual authenticator prior to using a group authenticator. | Allowing any user to elevate their privileges can allow them excessive control of the system tools. |
| V-216103 | Medium | The system must prevent the use of dictionary words for passwords. | The use of common words in passwords simplifies password-cracking attacks. |
| V-216102 | Medium | Graphical desktop environments provided by the system must automatically lock after 15 minutes of inactivity. | Allowing access to a graphical environment when the user is not attending the system can allow unauthorized users access to the system. |
| V-216101 | Medium | The system must require users to re-authenticate to unlock a graphical desktop environment. | Allowing access to a graphical environment when the user is not attending the system can allow unauthorized users access to the system. |
| V-216100 | Medium | The delay between login prompts following a failed login attempt must be at least 4 seconds. | As an immediate return of an error message, coupled with the capability to try again, may facilitate automatic and rapid-fire brute-force password attacks by a malicious user. |
| V-216020 | Medium | Audit records must include where the events occurred. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account.
Without accurate time stamps, source, user, and... |
| V-216021 | Medium | Audit records must include the sources of the events that occurred. | Without accurate source information malicious activity cannot be accurately tracked. |
| V-216022 | Medium | Audit records must include the outcome (success or failure) of the events that occurred. | Tracking both the successful and unsuccessful attempts aids in identifying threats to the system. |
| V-216023 | Medium | The audit system must be configured to audit file deletions. | Without auditing, malicious activity cannot be detected. |
| V-216024 | Medium | The audit system must be configured to audit account creation. | Without auditing, malicious activity cannot be detected. |
| V-216025 | Medium | The audit system must be configured to audit account modification. | Without auditing, malicious activity cannot be detected. |
| V-216026 | Medium | The operating system must automatically audit account disabling actions. | Without auditing, malicious activity cannot be detected. |
| V-216106 | Medium | The default umask for system and users must be 077. | Setting a very secure default value for umask ensures that users make a conscious choice about their file permissions. |
| V-216018 | Medium | Audit records must include what type of events occurred. | Without proper system auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-216199 | Medium | The operating system must have no unowned files. | A new user who is assigned a deleted user's user ID or group ID may then end up owning these files, and thus have more access on the system than was intended. |
| V-216194 | Medium | Duplicate group names must not exist. | If a group is assigned a duplicate group name, it will create and have access to files with the first GID for that group in group. Effectively, the GID is shared, which is a security risk. |
| V-216195 | Medium | User .netrc files must not exist. | The .netrc file presents a significant security risk since it stores passwords in unencrypted form. |
| V-216196 | Medium | The system must not allow users to configure .forward files. | Use of the .forward file poses a security risk in that sensitive data may be inadvertently transferred outside the organization. The .forward file also poses a secondary risk as it can be used to... |
| V-216197 | Medium | World-writable files must not exist. | Data in world-writable files can be read, modified, and potentially compromised by any user on the system. World-writable files may also indicate an incorrectly written script or program that... |
| V-216190 | Medium | Duplicate UIDs must not exist for multiple non-organizational users. | Non-organizational users must be assigned unique UIDs for accountability and to ensure appropriate access protections. |
| V-216191 | Medium | Duplicate Group IDs (GIDs) must not exist for multiple groups. | User groups must be assigned unique GIDs for accountability and to ensure appropriate access protections. |
| V-216192 | Medium | Reserved UIDs 0-99 must only be used by system accounts. | If a user is assigned a UID that is in the reserved range, even if it is not presently in use, security exposures can arise if a subsequently installed application uses the same UID. |
| V-216193 | Medium | Duplicate user names must not exist. | If a user is assigned a duplicate user name, it will create and have access to files with the first UID for that username in passwd. |
| V-216223 | Medium | Direct logins must not be permitted to shared, default, application, or utility accounts. | Shared accounts (accounts where two or more people log in with the same user identification) do not provide identification and authentication. There is no way to provide for non-repudiation or... |
| V-216221 | Medium | A file integrity baseline must be created, maintained, and reviewed at least weekly to determine if unauthorized changes have been made to important system files located in the root file system. | A file integrity baseline is a collection of file metadata used to evaluate the integrity of the system. A minimal baseline must contain metadata for all device files, setuid files, setgid files,... |
| V-216226 | Medium | The operating system must conduct backups of system-level information contained in the information system per organization-defined frequency to conduct backups that are consistent with recovery time and recovery point objectives. | Operating system backup is a critical step in maintaining data assurance and availability.
System-level information is data generated for/by the host (such as configuration settings) and/or... |
| V-216227 | Medium | The operating system must conduct backups of operating system documentation including security-related documentation per organization-defined frequency to conduct backups that is consistent with recovery time and recovery point objectives. | Operating system backup is a critical step in maintaining data assurance and availability.
System documentation is data generated for/by the host (such as logs) and/or administrative... |
| V-216225 | Medium | The operating system must conduct backups of user-level information contained in the operating system per organization-defined frequency to conduct backups consistent with recovery time and recovery point objectives. | Operating system backup is a critical step in maintaining data assurance and availability.
User-level information is data generated by information system and/or application users.
Backups shall... |
| V-216228 | Medium | The operating system must prevent the execution of prohibited mobile code. | Decisions regarding the employment of mobile code within operating systems are based on the potential for the code to cause damage to the system if used maliciously.
Mobile code technologies... |
| V-216135 | Medium | The system must not respond to broadcast ICMP echo requests. | ICMP echo requests can be useful for reconnaissance of systems and for denial of service attacks. |
| V-216208 | Medium | 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-216209 | Medium | The system must be configured to store any process core dumps in a specific, centralized directory. | Specifying a centralized location for core file creation allows for the centralized protection of core files. Process core dumps contain the memory in use by the process when it crashed. Any data... |
| V-216204 | Medium | The operator must document all file system objects that have non-standard access control list settings. | Access Control Lists allow an object owner to expand permissions on an object to specific users and groups in addition to the standard permission model. Non-standard Access Control List settings... |
| V-216109 | Medium | User accounts must be locked after 35 days of inactivity. | Attackers that are able to exploit an inactive account can potentially obtain and maintain undetected access to an application. Owners of inactive accounts will not notice if unauthorized access... |
| V-216189 | Medium | Duplicate User IDs (UIDs) must not exist for users within the organization. | Users within the organization must be assigned unique UIDs for accountability and to ensure appropriate access protections. |
| V-216185 | Medium | Groups assigned to users must exist in the /etc/group file. | Groups defined in passwd but not in group file pose a threat to system security since group permissions are not properly managed. |
| V-216027 | Medium | The operating system must automatically audit account termination. | Without auditing, malicious activity cannot be detected. |
| V-216183 | Medium | Permissions on user .netrc files must be 750 or less permissive. | .netrc files may contain unencrypted passwords that can be used to attack other systems. |
| V-216181 | Medium | Permissions on user home directories must be 750 or less permissive. | Group-writable or world-writable user home directories may enable malicious users to steal or modify other users' data or to gain another user's system privileges. |
| V-216180 | Medium | The sticky bit must be set on all world writable directories. | Files in directories that have had the "sticky bit" enabled can only be deleted by users that have both write permissions for the directory in which the file resides, as well as ownership of the... |
| V-216086 | 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-216237 | Medium | The operating system must manage excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial of service attacks. | In the case of denial of service attacks, care must be taken when designing the operating system so as to ensure that the operating system makes the best use of system resources. |
| V-216129 | Medium | The operating system must prevent remote devices that have established a non-remote connection with the system from communicating outside of the communication path with resources in external networks. | This control enhancement is implemented within the remote device (e.g., notebook/laptop computer) via configuration settings not configurable by the user of the device. An example of a non-remote... |
| V-216083 | Medium | TCP Wrappers must be enabled and configured per site policy to only allow access by approved hosts and services. | TCP Wrappers are a host-based access control system that allows administrators to control who has access to various network services based on the IP address of the remote end of the connection.... |
| V-216080 | Medium | The graphical login service provides the capability of logging into the system using an X-Windows type interface from the console. If graphical login access for the console is required, the service must be in local-only mode. | Externally accessible graphical desktop software may open the system to remote attacks. |
| V-216127 | Medium | The operating system session lock mechanism, when activated on a device with a display screen, must place a publicly viewable pattern onto the associated display, hiding what was previously visible on the screen. | A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the system but does not log out because of the temporary nature of... |
| V-216188 | Medium | All home directories must be owned by the respective user assigned to it in /etc/passwd. | Since the user is accountable for files stored in the user's home directory, the user must be the owner of the directory. |
| V-216121 | Medium | The use of FTP must be restricted. | FTP is an insecure protocol that transfers files and credentials in clear text, and can be replaced by using SFTP. However, if FTP is permitted for use in the environment, it is important to... |
| V-216120 | Medium | Host-based authentication for login-based services must be disabled. | The use of .rhosts authentication is an insecure protocol and can be replaced with public-key authentication using Secure Shell. As automatic authentication settings in the .rhosts files can... |
| V-216088 | Medium | The operating system must enforce minimum password lifetime restrictions. | Passwords need to be changed at specific policy-based intervals; however, if the information system or application allows the user to immediately and continually change their password, then the... |
| V-216050 | Medium | System packages must be configured with the vendor-provided files, permissions, and ownerships. | Failure to maintain system configurations may result in privilege escalation. |
| V-216089 | Medium | User passwords must be at least 15 characters in length. | Password complexity, or strength, is a measure of the effectiveness of a password in resisting guessing and brute-force attacks.
Password length is one factor of several that helps to determine... |
| V-216229 | Medium | The operating system must employ PKI solutions at workstations, servers, or mobile computing devices on the network to create, manage, distribute, use, store, and revoke digital certificates. | Without the use of PKI systems to manage digital certificates, the operating system or other system components may be unable to securely communicate on a network or reliably verify the identity of... |
| V-216182 | Medium | Permissions on user . (hidden) files must be 750 or less permissive. | Group-writable or world-writable user configuration files may enable malicious users to steal or modify other users' data or to gain another user's system privileges. |
| V-233301 | Medium | The sshd server must bind the X11 forwarding server to the loopback address. | As enabling X11 Forwarding on the host can permit a malicious user to secretly open another X11 connection to another remote client during the session and perform unobtrusive activities such as... |
| V-216019 | Medium | Audit records must include when (date and time) the events occurred. | Without accurate time stamps malicious activity cannot be accurately tracked. |
| V-216240 | Medium | The systems physical devices must not be assigned to non-global zones. | Solaris non-global zones can be assigned physical hardware devices. This increases the risk of such a non-global zone having the capability to compromise the global zone. |
| V-216243 | Medium | The operating system must monitor for unauthorized connections of mobile devices to organizational information systems. | Mobile devices include portable storage media (e.g., USB memory sticks, external hard disk drives) and portable computing and communications devices with information storage capability (e.g.,... |
| V-216015 | Medium | The audit records must provide data for all auditable events defined at the organizational level for the organization-defined information system components. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account.
Without accurate time stamps, source, user, and... |
| V-216014 | Medium | The operating system must provide the capability to automatically process audit records for events of interest based upon selectable, event criteria. | Without an audit reporting capability, users find it difficult to identify specific patterns of attack. |
| V-216016 | Medium | The operating system must generate audit records for the selected list of auditable events as defined in DoD list of events. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account.
Without accurate time stamps, source, user, and... |
| V-216150 | Medium | The boundary protection system (firewall) must be configured to deny network traffic by default and must allow network traffic by exception (i.e., deny all, permit by exception). | A firewall that relies on a deny all, permit by exception strategy requires all traffic to have explicit permission before traversing an interface on the host. The firewall must incorporate... |
| V-216231 | Medium | The operating system must employ malicious code protection mechanisms at workstations, servers, or mobile computing devices on the network to detect and eradicate malicious code transported by electronic mail, electronic mail attachments, web accesses, removable media, or other common means. | In order to minimize potential negative impact to the organization caused by malicious code, it is imperative that malicious code is identified and eradicated prior to entering protected enclaves... |
| V-216233 | Medium | The operating system must back up audit records at least every seven days onto a different system or system component than the system or component being audited. | Protection of log data includes assuring log data is not accidentally lost or deleted. Backing up audit records to a different system or onto separate media than the system being audited on an... |
| V-216124 | Medium | Logins to the root account must be restricted to the system console only. | Use an authorized mechanism such as RBAC and the "su" command to provide administrative access to unprivileged accounts. These mechanisms provide an audit trail in the event of problems. |
| V-224672 | Medium | The operating system must prevent non-privileged users from circumventing malicious code protection capabilities. | In order to minimize potential negative impact to the organization caused by malicious code, it is imperative that malicious code is identified and eradicated prior to entering protected enclaves... |
| V-216126 | Medium | The operating system must provide the capability for users to directly initiate session lock mechanisms. | A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the system but does not want to log out because of the temporary nature of... |
| V-216064 | Medium | All run control scripts must have mode 0755 or less permissive. | If the startup files are writable by other users, these users could modify the startup files to insert malicious commands into the startup files. |
| V-216065 | Medium | All run control scripts must have no extended ACLs. | If the startup files are writable by other users, these users could modify the startup files to insert malicious commands into the startup files. |
| V-216066 | Medium | Run control scripts 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-216067 | Medium | Run control scripts library search paths must contain only authorized 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-216060 | Medium | The VNC server package must not be installed unless required. | The VNC service uses weak authentication capabilities and provides the user complete graphical system access. |
| V-216123 | Medium | Unauthorized use of the at or cron capabilities must not be permitted. | On many systems, only the system administrator needs the ability to schedule jobs.
Even though a given user is not listed in the "cron.allow" file, cron jobs can still be run as that user. The... |
| V-216062 | Medium | The operating system must be configured to provide essential capabilities. | Operating systems are capable of providing a wide variety of functions and services. Execution must be disabled based on organization-defined specifications. |
| V-216143 | Medium | The system must disable network routing unless required. | The network routing daemon, in.routed, manages network routing tables. If enabled, it periodically supplies copies of the system's routing tables to any directly connected hosts and networks and... |
| V-216141 | Medium | The system must set maximum number of half-open TCP connections to 4096. | This setting controls how many half-open connections can exist for a TCP port.
It is necessary to control the number of completed connections to the system to provide some protection against... |
| V-216068 | 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-216069 | Medium | Run control scripts must not execute world writable programs or scripts. | World writable files could be modified accidentally or maliciously to compromise system integrity. |
| V-224673 | Medium | The operating system must identify potentially security-relevant error conditions. | Security functional testing involves testing the operating system for conformance to the operating system security function specifications, as well as for the underlying security model. The need... |
| V-216099 | Medium | The system must disable accounts after three consecutive unsuccessful login attempts. | Allowing continued access to accounts on the system exposes them to brute-force password-guessing attacks. |
| V-216098 | Medium | Systems must employ cryptographic hashes for passwords using the SHA-2 family of algorithms or FIPS 140-2 approved successors. | Cryptographic hashes provide quick password authentication while not actually storing the password. |
| V-216091 | 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 old and new passwords have significant differences. Without significant changes, new passwords may be easily guessed... |
| V-216093 | Medium | The operating system must enforce password complexity requiring that at least one lowercase character is used. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
| V-216092 | Medium | The system must require passwords to contain at least one uppercase alphabetic character. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
| V-216095 | Medium | The system must require passwords to contain at least one special character. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
| V-216094 | Medium | The system must require passwords to contain at least one numeric character. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
| V-216097 | Medium | The system must not have accounts configured with blank or null passwords. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
| V-216178 | Low | The operating system must use cryptographic mechanisms to protect the integrity of audit information. | Protection of audit records and audit data is of critical importance. Cryptographic mechanisms are the industry established standard used to protect the integrity of audit data. |
| V-216176 | Low | The operating system must protect the confidentiality and integrity of information at rest. | When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digital assistants, flash/thumb drives, etc., there is risk of data loss and... |
| V-216130 | Low | The operating system must limit the number of concurrent sessions for each account to an organization-defined number of sessions. | Limiting the number of allowed users and sessions per user can limit risks related to denial of service attacks. The organization may define the maximum number of concurrent sessions for an... |
| V-216082 | Low | Systems services that are not required must be disabled. | Services that are enabled but not required by the mission may provide excessive access or additional attack vectors to penetrate the system. |
| V-216161 | Low | The FTP service must display the DoD approved system use notification message or banner before granting access to the system. | Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must include the name of the organization that owns the system and any... |
| V-216160 | Low | The GNOME service must display the DoD approved system use notification message or banner before granting access to the system. | Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must include the name of the organization that owns the system and any... |
| V-220010 | Low | The operating system must employ cryptographic mechanisms to protect information in storage. | When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digital assistants, flash/thumb drives, etc., there is risk of data loss and... |
| V-220011 | Low | The operating system must employ cryptographic mechanisms to prevent unauthorized disclosure of information at rest unless otherwise protected by alternative physical measures. | When data is written to digital media, such as hard drives, mobile computers, external/removable hard drives, personal digital assistants, flash/thumb drives, etc., there is risk of data loss and... |
| V-216058 | Low | The UUCP service daemon must not be installed unless required. | UUCP is an insecure protocol. |
| V-216200 | Low | The operating system must have no files with extended attributes. | Attackers or malicious users could hide information, exploits, etc. in extended attribute areas. Since extended attributes are rarely used, it is important to find files with extended attributes... |
| V-216115 | Low | Consecutive login attempts for SSH must be limited to 3. | Setting the authentication login limit to a low value will disconnect the attacker and force a reconnect, which severely limits the speed of such brute-force attacks. |
| V-216119 | Low | The operating system must terminate the network connection associated with a communications session at the end of the session or after 10 minutes of inactivity. | This requirement applies to both internal and external networks.
Terminating network connections associated with communications sessions means de-allocating associated TCP/IP address/port pairs... |
| V-216034 | Low | The operating system must protect against an individual falsely denying having performed a particular action. In order to do so the system must be configured to send audit records to a remote audit server. | Keeping audit records on a remote system reduces the likelihood of audit records being changed or corrupted. Duplicating and protecting the audit trail on a separate system reduces the likelihood... |
| V-216218 | Low | The system must require authentication before allowing modification of the boot devices or menus. Secure the GRUB Menu (Intel). | The flexibility that GRUB provides creates a security risk if its configuration is modified by an unauthorized user. The failsafe menu entry needs to be secured in the same environments that... |
| V-216217 | Low | System BIOS or system controllers supporting password protection must have administrator accounts/passwords configured, and no others. (Intel) | A system's BIOS or system controller handles the initial startup of a system and its configuration must be protected from unauthorized modification. When the BIOS or system controller supports the... |
| V-216108 | Low | The value mesg n must be configured as the default setting for all users. | The "mesg n" command blocks attempts to use the "write" or "talk" commands to contact users at their terminals, but has the side effect of slightly strengthening permissions on the user's TTY device. |
| V-216107 | Low | The default umask for FTP users must be 077. | Setting a very secure default value for umask ensures that users make a conscious choice about their file permissions. |
| V-216139 | Low | The system must disable ICMP redirect messages. | A malicious user can exploit the ability of the system to send ICMP redirects by continually sending packets to the system, forcing the system to respond with ICMP redirect messages, resulting in... |
| V-216198 | Low | All valid SUID/SGID files must be documented. | There are valid reasons for SUID/SGID programs, but it is important to identify and review such programs to ensure they are legitimate. |
| V-216224 | Low | The system must not have any unnecessary accounts. | Accounts providing no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system and... |
| V-216132 | Low | The system must not respond to ICMP timestamp requests. | By accurately determining the system's clock state, an attacker can more effectively attack certain time-based pseudorandom number generators (PRNGs) and the authentication systems that rely on them. |
| V-216133 | Low | The system must not respond to ICMP broadcast timestamp requests. | By accurately determining the system's clock state, an attacker can more effectively attack certain time-based pseudorandom number generators (PRNGs) and the authentication systems that rely on them. |
| V-216131 | Low | The system must disable directed broadcast packet forwarding. | This parameter must be disabled to reduce the risk of denial of service attacks. |
| V-216136 | Low | The system must not respond to multicast echo requests. | Multicast echo requests can be useful for reconnaissance of systems and for denial of service attacks. |
| V-216137 | Low | The system must ignore ICMP redirect messages. | Ignoring ICMP redirect messages reduces the likelihood of denial of service attacks. |
| V-216134 | Low | The system must not respond to ICMP broadcast netmask requests. | By determining the netmasks of various computers in your network, an attacker can better map your subnet structure and infer trust relationships. |
| V-216033 | Low | The audit system must be configured to audit failed attempts to access files and programs. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-216030 | Low | The audit system must be configured to audit login, logout, and session initiation. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-216035 | Low | The auditing system must not define a different auditing level for specific users. | Without auditing, individual system accesses cannot be tracked, and malicious activity cannot be detected and traced back to an individual account. |
| V-216054 | Low | The pidgin IM client package must not be installed. | Instant messaging is an insecure protocol. |
| V-216187 | Low | All user accounts must be configured to use a home directory that exists. | If the user's home directory does not exist, the user will be placed in "/" and will not be able to write any files or have local environment variables set. |
| V-216186 | Low | Users must have a valid home directory assignment. | All users must be assigned a home directory in the passwd file. Failure to have a home directory may result in the user being put in the root directory. |
| V-216087 | Low | The operating system must automatically terminate temporary accounts within 72 hours. | If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain unauthorized access. To mitigate this risk, automated termination of... |
| V-216207 | Low | Address Space Layout Randomization (ASLR) must be enabled. | Modification of memory area can result in executable code vulnerabilities. ASLR can reduce the likelihood of these attacks. ASLR activates the randomization of key areas of the process such as... |
| V-216081 | Low | Generic Security Services (GSS) must be disabled. | This service should be disabled if it is not required. |
| V-216125 | Low | The operating system, upon successful logon, must display to the user the date and time of the last logon (access). | Users need to be aware of activity that occurs regarding their account. Providing users with information regarding the date and time of their last successful login allows the user to determine if... |
| V-216051 | Low | The finger daemon package must not be installed. | Finger is an insecure protocol. |
| V-216202 | Low | The operating system must reveal error messages only to authorized personnel. | Proper file permissions and ownership ensures that only designated personnel in the organization can access error messages. |
| V-216158 | Low | The operating system must display the DoD approved system use notification message or banner before granting access to the system for general system logons. | Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must include the name of the organization that owns the system and any... |
| V-216159 | Low | The operating system must display the DoD approved system use notification message or banner for SSH connections. | Warning messages inform users who are attempting to log in to the system of their legal status regarding the system and must include the name of the organization that owns the system and any... |
| V-216234 | Low | All manual editing of system-relevant files shall be done using the pfedit command, which logs changes made to the files. | Editing a system file with common tools such as vi, emacs, or gedit does not allow the auditing of changes made by an operator. This reduces the capability of determining which operator made... |
| V-216241 | Low | The audit system must identify in which zone an event occurred. | Tracking the specific Solaris zones in the audit trail reduces the time required to determine the cause of a security event. |
| V-216242 | Low | The audit system must maintain a central audit trail for all zones. | Centralized auditing simplifies the investigative process to determine the cause of a security event. |
| V-216157 | Low | The system must prevent local applications from generating source-routed packets. | Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. |
| V-216239 | Low | The limitpriv zone option must be set to the vendor default or less permissive. | Solaris zones can be assigned privileges generally reserved for the global zone using the "limitpriv" zone option. Any privilege assignments in excess of the vendor defaults may provide the... |
| V-216238 | Low | The /etc/zones directory, and its contents, must have the vendor default owner, group, and permissions. | Incorrect ownership can result in unauthorized changes or theft of data. |
| V-216142 | Low | The system must set maximum number of incoming connections to 1024. | This setting controls the maximum number of incoming connections that can be accepted on a TCP port limiting exposure to denial of service attacks. |
| V-216140 | Low | The system must disable TCP reverse IP source routing. | If enabled, reverse IP source routing would allow an attacker to more easily complete a three-way TCP handshake and spoof new connections. |
| V-216144 | Low | The system must implement TCP Wrappers. | TCP Wrappers is a host-based access control system that allows administrators to control who has access to various network services based on the IP address of the remote end of the connection. TCP... |
| V-216096 | Low | The system must require passwords to contain no more than three consecutive repeating characters. | Complex passwords can reduce the likelihood of success of automated password-guessing attacks. |
