| V-215108 | High | The telnetd package must not be installed. | It is detrimental for Ubuntu operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often... |
| V-214963 | High | The Ubuntu operating system must not be configured to allow blank or null passwords. | If the operating system allows empty passwords, anyone could log on and run commands with the privileges. Empty passwords should never be used in operational environments. |
| V-214939 | High | The Ubuntu operating system must be a vendor supported release. | An Ubuntu 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... |
| V-214999 | High | The root account must be the only account having unrestricted access to the system. | If an account other than root also has a User Identifier (UID) of "0", it has root authority, giving that account unrestricted access to the entire Ubuntu operating system. Multiple accounts with... |
| V-215157 | High | A File Transfer Protocol (FTP) server package must not be installed unless needed. | The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using... |
| V-215126 | High | The Ubuntu operating system must be configured so that the SSH daemon does not allow authentication using an empty password. | Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| V-215121 | High | The Ubuntu operating system must enforce SSHv2 for network access to all accounts. | A replay attack may enable an unauthorized user to gain access to the Ubuntu operating system. Authentication sessions between the authenticator and the Ubuntu operating system validating the user... |
| V-214994 | High | The x86 Ctrl-Alt-Delete key sequence must be disabled. | A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create... |
| V-214995 | High | The x86 Ctrl-Alt-Delete key sequence in the Ubuntu operating system must be disabled if a Graphical User Interface is installed. | A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create... |
| V-215137 | High | The Ubuntu operating system must be configured so that remote X connections are disabled unless to fulfill documented and validated mission requirements. | The security risk of using X11 forwarding is that the client's X11 display server may be exposed to attack when the SSH client requests forwarding. A system administrator may have a stance in... |
| V-220332 | High | The system must use a DoD-approved virus scan program. | Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems.
The virus scanning software should be... |
| V-215139 | High | All networked systems must have and implement SSH to protect the confidentiality and integrity of transmitted and received information, as well as information during preparation for transmission. | Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered.
This... |
| V-215110 | High | The rsh-server package must not be installed. | It is detrimental for Ubuntu operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often... |
| V-215109 | High | The Network Information Service (NIS) package must not be installed. | Removing the Network Information Service (NIS) package decreases the risk of the accidental (or intentional) activation of NIS or NIS+ services. |
| V-214978 | High | Ubuntu operating systems booted with United Extensible Firmware Interface (UEFI) implemented must require authentication upon booting into single-user mode and maintenance. | To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must... |
| V-214979 | High | All persistent disk partitions must implement cryptographic mechanisms to prevent unauthorized disclosure or modification of all information that requires at rest protection. | Ubuntu operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at... |
| V-215158 | High | The Trivial File Transfer Protocol (TFTP) server package must not be installed if not required for operational support. | If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented with the Information System Security Officer (ISSO), restricted to only... |
| V-214974 | High | There must be no .shosts files on the Ubuntu operating system. | The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the... |
| V-214975 | High | There must be no shosts.equiv files on the Ubuntu operating system. | The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it... |
| V-214976 | High | The Ubuntu operating system must implement NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards. | Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The Ubuntu operating system must implement cryptographic modules adhering to the... |
| V-214977 | High | Ubuntu operating systems booted with a BIOS must require authentication upon booting into single-user and maintenance modes. | To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must... |
| V-214972 | High | Unattended or automatic login via the Graphical User Interface must not be allowed. | Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| V-215072 | Medium | The audit system must be configured to audit any usage of the lremovexattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215073 | Medium | The audit system must be configured to audit any usage of the fremovexattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215070 | Medium | The audit system must be configured to audit any usage of the fsetxattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215071 | Medium | The audit system must be configured to audit any usage of the removexattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215076 | Medium | Successful/unsuccessful uses of the fchownat command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215077 | Medium | Successful/unsuccessful uses of the lchown command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215074 | Medium | Successful/unsuccessful uses of the chown command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215075 | Medium | Successful/unsuccessful uses of the fchown command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215078 | Medium | Successful/unsuccessful uses of the chmod command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215079 | Medium | Successful/unsuccessful uses of the fchmod command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-214989 | Medium | Advance package Tool (APT) must remove all software components after updated versions have been installed. | Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products... |
| V-214988 | Medium | Advance package Tool (APT) must be configured to prevent the installation of patches, service packs, device drivers, or Ubuntu operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization. | Changes to any software components can have significant effects on the overall security of the Ubuntu operating system. This requirement ensures the software has not been tampered with and that it... |
| V-233624 | Medium | The Ubuntu operating system SSH daemon must prevent remote hosts from connecting to the proxy display. | When X11 forwarding is enabled, there may be additional exposure to the server and client displays if the SSHD proxy display is configured to listen on the wildcard address. By default, SSHD binds... |
| V-214969 | Medium | The Ubuntu operating system must require users to re-authenticate for privilege escalation and changing roles. | Without re-authentication, users may access resources or perform tasks for which they do not have authorization.
When Ubuntu operating systems provide the capability to escalate a functional... |
| V-214968 | Medium | Accounts on the Ubuntu operating system that are subject to three unsuccessful logon attempts within 15 minutes must be locked for the maximum configurable period. | By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account. |
| V-214967 | Medium | The Ubuntu operating system must automatically lock an account until the locked account is released by an administrator when three unsuccessful logon attempts. | By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the... |
| V-214966 | Medium | Account identifiers (individuals, groups, roles, and devices) must disabled after 35 days of inactivity. | Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive... |
| V-214965 | Medium | The passwd command must be configured to prevent the use of dictionary words as passwords. | If the Ubuntu operating system allows the user to select passwords based on dictionary words, this increases the chances of password compromise by increasing the opportunity for successful guesses... |
| V-214964 | Medium | The Ubuntu operating system must prevent the use of dictionary words for passwords. | If the Ubuntu operating system allows the user to select passwords based on dictionary words, this increases the chances of password compromise by increasing the opportunity for successful guesses... |
| V-214962 | Medium | Passwords must have a minimum of 15-characters. | The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised.
Password complexity, or strength, is a measure of the... |
| V-214961 | Medium | Passwords must be prohibited from reuse for a minimum of five generations. | Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the... |
| V-214960 | Medium | Passwords for new users must have a 60-day maximum password lifetime restriction. | Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the Ubuntu operating system does not limit the lifetime of passwords and... |
| V-215065 | Medium | Successful/unsuccessful uses of the ssh-agent command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215064 | Medium | Successful/unsuccessful uses of the umount command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215067 | Medium | The audit system must be configured to audit any usage of the kmod command. | Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.
Audit... |
| V-215066 | Medium | Successful/unsuccessful uses of the ssh-keysign command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215061 | Medium | Successful/unsuccessful uses of the su command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215060 | Medium | The audit system must be configured to audit the execution of privileged functions and prevent all software from executing at higher privilege levels than users executing the software. | Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious... |
| V-215062 | Medium | Successful/unsuccessful uses of the chfn command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215069 | Medium | The audit system must be configured to audit any usage of the lsetxattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215068 | Medium | The audit system must be configured to audit any usage of the setxattr system call. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215053 | Medium | The audit event multiplexor must be configured to off-load audit logs onto a different system or storage media from the system being audited. | Information stored in one location is vulnerable to accidental or incidental deletion or alteration.
Off-loading is a common process in information systems with limited audit storage capacity. |
| V-215148 | Medium | The Ubuntu operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address. | Responding to broadcast Internet Control Message Protocol (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
| V-215149 | Medium | The Ubuntu operating system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted. | Internet Control Message Protocol (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... |
| V-215146 | Medium | The Ubuntu operating system must not forward Internet Protocol version 4 (IPv4) 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... |
| V-215147 | Medium | The Ubuntu operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default. | 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... |
| V-215144 | Medium | The Ubuntu operating system must be configured to use TCP syncookies. | DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.
Managing... |
| V-215142 | 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. |
| V-215143 | Medium | Wireless network adapters must be disabled. | Without protection of communications with wireless peripherals, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read, altered, or... |
| V-215140 | Medium | The audit system must take appropriate action when the network cannot be used to off-load audit records. | Information stored in one location is vulnerable to accidental or incidental deletion or alteration.
Off-loading is a common process in information systems with limited audit storage capacity. |
| V-215141 | Medium | All remote access methods must be monitored. | Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access... |
| V-214952 | Medium | All passwords must contain at least one special character. | Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity or strength is a measure of the effectiveness of a password in resisting... |
| V-214953 | Medium | The Ubuntu operating system must require the change of at least 8 characters when passwords are changed. | If the Ubuntu operating system allows the user to consecutively reuse extensive portions of passwords, this increases the chances of password compromise by increasing the window of opportunity for... |
| V-214950 | Medium | The Ubuntu operating system must enforce password complexity by requiring that at least one lower-case character be used. | Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in... |
| V-214951 | Medium | The Ubuntu operating system must enforce password complexity by requiring that at least one numeric character be used. | Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in... |
| V-214956 | Medium | The Ubuntu operating system must employ FIPS 140-2 approved cryptographic hashing algorithms for all created passwords. | The system must use a strong hashing algorithm to store the password. The system must use a sufficient number of hashing rounds to ensure the required level of entropy.
Passwords need to be... |
| V-214957 | Medium | The pam_unix.so module must use a FIPS 140-2 approved cryptographic hashing algorithm for system authentication. | Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be... |
| V-214954 | Medium | The Ubuntu operating system must encrypt all stored passwords with a FIPS 140-2 approved cryptographic hashing algorithm. | Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily... |
| V-214955 | Medium | The Ubuntu operating system must employ a FIPS 140-2 approved cryptographic hashing algorithms for all stored passwords. | The system must use a strong hashing algorithm to store the password. The system must use a sufficient number of hashing rounds to ensure the required level of entropy.
Passwords need to be... |
| V-214958 | Medium | Emergency administrator accounts must never be automatically removed or disabled. | Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation... |
| V-214959 | Medium | Passwords for new users must have a 24 hours/1 day minimum password lifetime restriction. | Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and... |
| V-214998 | Medium | Duplicate User IDs (UIDs) must not exist for interactive users. | To assure accountability and prevent unauthenticated access, interactive users must be identified and authenticated to prevent potential misuse and compromise of the system.
Interactive users... |
| V-215010 | Medium | All local interactive user initialization files executable search paths must contain only paths that resolve to the system default or the users home directory. | 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-215011 | Medium | Local initialization files must not execute world-writable programs. | If user start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to destroy user files or otherwise compromise the system at the... |
| V-215012 | Medium | File systems that contain user home directories must be mounted to prevent files with the setuid and setguid bit set from being executed. | The "nosuid" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and... |
| V-215013 | Medium | File systems that are used with removable media must be mounted to prevent files with the setuid and setguid bit set from being executed. | The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid"... |
| V-215014 | Medium | File systems that are being imported via Network File System (NFS) must be mounted to prevent files with the setuid and setguid bit set from being executed. | The "nosuid" mount option causes the system to not execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid"... |
| V-215015 | Medium | File systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed. | The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible.... |
| V-215016 | 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-215017 | Medium | 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-215098 | Medium | Successful/unsuccessful uses of the passwd command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215099 | Medium | Successful/unsuccessful uses of the unix_update command must generate an audit record. | Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.
At a minimum, the organization must audit the full-text recording of... |
| V-215153 | Medium | The Ubuntu operating system must not be performing packet forwarding 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-215152 | Medium | The Ubuntu operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects. | Internet Control Message Protocol (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... |
| V-215155 | Medium | The Ubuntu operating system must be configured to prevent unrestricted mail relaying. | 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-215154 | Medium | Network interfaces must not be in promiscuous mode. | Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect... |
| V-215156 | Medium | The Information System Security Officer (ISSO) and System Administrator (SA) (at a minimum) must have mail aliases to be notified of an audit processing failure. | It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an... |
| V-215090 | Medium | Successful/unsuccessful uses of the newgrp command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215091 | Medium | Successful/unsuccessful uses of the chcon command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215092 | Medium | Successful/unsuccessful uses of the apparmor_parser command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215093 | Medium | Successful/unsuccessful uses of the setfacl command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215094 | Medium | Successful/unsuccessful uses of the chacl command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215095 | Medium | Successful/unsuccessful modifications to the tallylog file must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215096 | Medium | Successful/unsuccessful modifications to the faillog file must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215097 | Medium | Successful/unsuccessful modifications to the lastlog file must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-214945 | Medium | Ubuntu operating system sessions must be automatically logged out after 15 minutes of inactivity. | An Ubuntu operating system needs to be able to identify when a user's sessions has idled for longer than 15 minutes. The Ubuntu operating system must logout a users' session after 15 minutes to... |
| V-214944 | Medium | All users must be able to directly initiate a session lock for all connection types. | A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the... |
| V-214947 | Medium | The Ubuntu operating system must prevent direct login into the root account. | To assure individual accountability and prevent unauthorized access, organizational users must be individually identified and authenticated.
A group authenticator is a generic account used by... |
| V-214941 | Medium | The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a graphical user logon. | Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy and security notification verbiage used is consistent with applicable... |
| V-214940 | Medium | Ubuntu vendor packaged system security patches and updates must be installed and up to date. | Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information technology (IT) systems. However, failure to keep Ubuntu operating system... |
| V-214943 | Medium | The Ubuntu operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures. | A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the... |
| V-214942 | Medium | The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a command line user logon. | Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy and security notification verbiage used is consistent with applicable... |
| V-214991 | Medium | File system automounter must be disabled unless required. | Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.
Satisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163,... |
| V-214949 | Medium | The Ubuntu operating system must enforce password complexity by requiring that at least one upper-case character be used. | Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in... |
| V-214948 | Medium | The Ubuntu operating system must be configured so that when passwords are changed or new passwords are established, pwquality must be used. | Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in... |
| V-215003 | Medium | All files and directories must have a valid group owner. | Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner. |
| V-215002 | Medium | All files and directories must have a valid owner. | Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier "UID" as the UID of the un-owned files. |
| V-215001 | Medium | Pluggable Authentication Module (PAM) must prohibit the use of cached authentications after one day. | If cached authentication information is out-of-date, the validity of the authentication information may be questionable. |
| V-215000 | Medium | User accounts with temporary passwords, must require an immediate change to a permanent password after login. | Without providing this capability, an account may be created without a password. Non-repudiation cannot be guaranteed once an account is created if a user is not forced to change the temporary... |
| V-215007 | Medium | All local interactive user home directories must have mode 0750 or less permissive. | Excessive permissions on local interactive user home directories may allow unauthorized access to user files by other users. |
| V-215006 | Medium | All local interactive user home directories defined in the /etc/passwd file must exist. | If a local interactive user has a home directory defined that does not exist, the user may be given access to the / directory as the current working directory upon logon. This could create a... |
| V-215005 | Medium | All local interactive user accounts, upon creation, must be assigned a home directory. | If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own. |
| V-215004 | Medium | All local interactive users must have a home directory assigned in the /etc/passwd file. | If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own. |
| V-215009 | Medium | All local initialization files must have mode 0740 or less permissive. | Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon. |
| V-215008 | Medium | All local interactive user home directories must be group-owned by the home directory owners primary group. | If the Group Identifier (GID) of a local interactive user’s home directory is not the same as the primary GID of the user, this would allow unauthorized access to the user’s files, and users that... |
| V-215124 | Medium | The Ubuntu operating system must implement DoD-approved encryption to protect the confidentiality of SSH connections. | Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session.
Remote access is access to DoD nonpublic information... |
| V-215125 | Medium | The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms. | Without cryptographic integrity protections, information can be altered by unauthorized users without detection.
Remote access (e.g., RDP) is access to DoD nonpublic information systems by an... |
| V-215127 | Medium | The Ubuntu operating system must not allow users to override SSH environment variables. | Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| V-215120 | Medium | The Ubuntu operating system must implement address space layout randomization to protect its memory from unauthorized code execution. | Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory... |
| V-215122 | Medium | The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a ssh logon and the user must acknowledge the usage conditions and take explicit actions to log on for further access. | Display of a standardized and approved use notification before granting access to the Ubuntu operating system ensures privacy and security notification verbiage used is consistent with applicable... |
| V-215123 | Medium | The Ubuntu operating system must not permit direct logons to the root account using remote access via SSH. | Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of not logging on directly as root. In addition, logging on with a... |
| V-215083 | Medium | Successful/unsuccessful uses of the ftruncate command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215082 | Medium | Successful/unsuccessful uses of the truncate command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215081 | Medium | Successful/unsuccessful uses of the open command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215080 | Medium | Successful/unsuccessful uses of the fchmodat command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215128 | Medium | The system must display the date and time of the last successful account logon upon an SSH logon. | Providing users with feedback on when account accesses via SSH last occurred facilitates user recognition and reporting of unauthorized account use. |
| V-215129 | Medium | The Ubuntu operating system must be configured so that all network connections associated with SSH traffic are terminated at the end of the session or after 10 minutes of inactivity, except to fulfill documented and validated mission requirements. | Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections that are associated with communications sessions... |
| V-215085 | Medium | Successful/unsuccessful uses of the openat command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215084 | Medium | Successful/unsuccessful uses of the creat command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215130 | Medium | The Ubuntu operating system must be configured so that all network connections associated with SSH traffic terminate after a period of inactivity. | Automatic session termination addresses the termination of user-initiated logical sessions in contrast to the termination of network connections that are associated with communications sessions... |
| V-215048 | Medium | The Ubuntu operating system must allow only the Information System Security Manager (ISSM) (or individuals or roles appointed by the ISSM) to select which auditable events are to be audited. | Without the capability to restrict which roles and individuals can select which events are audited, unauthorized personnel may be able to prevent the auditing of critical events. Misconfigured... |
| V-215036 | Medium | The Ubuntu operating system must notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) via email when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity. | If security personnel are not notified immediately when storage volume reaches 75% utilization, they are unable to plan for audit record storage capacity expansion. |
| V-215037 | Medium | The System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) must be alerted of an audit processing failure event. | It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an... |
| V-215034 | Medium | The Ubuntu operating system must allocate audit record storage capacity to store at least one weeks worth of audit records, when audit records are not immediately sent to a central audit record storage facility. | In order to ensure Ubuntu operating systems have a sufficient storage capacity in which to write the audit logs, Ubuntu operating systems need to be able to allocate audit record storage... |
| V-215035 | Medium | The Ubuntu operating system must notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity. | If security personnel are not notified immediately when storage volume reaches 75% utilization, they are unable to plan for audit record storage capacity expansion. |
| V-215032 | Medium | Audit records must contain information to establish what type of events occurred, the source of events, where events occurred, and the outcome of events. | Without establishing what type of events occurred, the source of events, where events occurred, and the outcome of events, it would be difficult to establish, correlate, and investigate the events... |
| V-215033 | Medium | The auditd service must be running in the Ubuntu operating system. | Configuring the Ubuntu operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common... |
| V-215030 | Medium | System commands must be owned by root. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-215031 | Medium | System commands must be group-owned by root. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-214996 | Medium | Default permissions must be defined in such a way that all authenticated users can only read and modify their own files. | Setting the most restrictive default permissions ensures that when new accounts are created they do not have unnecessary access. |
| V-214997 | Medium | The Ubuntu operating system must not have 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-214992 | Medium | Pam_Apparmor must be configured to allow system administrators to pass information to any other Ubuntu operating system administrator or user, change security attributes, and to confine all non-privileged users from executing functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures. | Discretionary Access Control (DAC) is based on the notion that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in... |
| V-214993 | Medium | The Apparmor module must be configured to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs and limit the ability of non-privileged users to grant other users direct access to the contents of their home directories/folders. | The organization must identify authorized software programs and permit execution of authorized software. The process used to identify software programs that are authorized to execute on... |
| V-215038 | Medium | The System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) must be alerted when the audit storage volume is full. | It is critical that when the Ubuntu operating system is at risk of failing to process audit logs as required, it takes action to mitigate the failure. Audit processing failures include:... |
| V-215039 | Medium | The audit system must take appropriate action when the audit storage volume is full. | It is critical that when the Ubuntu operating system is at risk of failing to process audit logs as required, it takes action to mitigate the failure. Audit processing failures include:... |
| V-215136 | 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-215135 | 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-215134 | 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 on to the system as another user. |
| V-215133 | 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-215132 | 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-215131 | Medium | The SSH daemon must not allow authentication using known hosts authentication. | Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere. |
| V-215138 | Medium | An application firewall must protect against or limit the effects of Denial of Service (DoS) attacks by ensuring the Ubuntu operating system is implementing rate-limiting measures on impacted network interfaces. | DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.
This... |
| V-215055 | Medium | The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215029 | Medium | System commands must have mode 0755 or less permissive. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-215028 | Medium | Library files must be group-owned by root. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-215021 | Medium | The /var/log directory must be owned by root. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215020 | Medium | The /var/log directory must be group-owned by syslog. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215023 | Medium | The /var/log/syslog file must be group-owned by adm. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215022 | Medium | The /var/log directory must have mode 0770 or less permissive. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215025 | Medium | The /var/log/syslog file must have mode 0640 or less permissive. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215089 | Medium | Successful/unsuccessful uses of the chsh command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215027 | Medium | Library files must be owned by root. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-215026 | Medium | Library files must have mode 0755 or less permissive. | If the Ubuntu operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that... |
| V-214981 | Medium | All world-writable directories must be group-owned by root, sys, bin, or an application group. | If a world-writable directory has the sticky bit set and is not group-owned by a privileged Group Identifier (GID), unauthorized users may be able to modify files created by others.
The only... |
| V-214980 | Medium | All public directories must be owned by root to prevent unauthorized and unintended information transferred via shared system resources. | Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of... |
| V-214983 | Medium | The file integrity tool must perform verification of the correct operation of security functions: upon system start-up and/or restart; upon command by a user with privileged access; and/or every 30 days. | Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or... |
| V-214982 | Medium | A file integrity tool must be installed to verify correct operation of all security functions in the Ubuntu operating system. | Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or... |
| V-214987 | Medium | The Ubuntu operating system must use cryptographic mechanisms to protect the integrity of audit tools. | Protecting the integrity of the tools used for auditing purposes is a critical step toward ensuring the integrity of audit information. Audit information includes all information (e.g., audit... |
| V-214986 | Medium | The file integrity tool must notify the system administrator when changes to the baseline configuration or anomalies in the operation of any security functions are discovered. | Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the Ubuntu operating system. Changes to Ubuntu operating... |
| V-215102 | Medium | Successful/unsuccessful uses of the usermod command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215103 | Medium | Successful/unsuccessful uses of the crontab command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215100 | Medium | Successful/unsuccessful uses of the gpasswd command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215101 | Medium | Successful/unsuccessful uses of the chage command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215106 | Medium | Successful/unsuccessful uses of the finit_module command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215107 | Medium | Successful/unsuccessful uses of the delete_module command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215104 | Medium | Successful/unsuccessful uses of the pam_timestamp_check command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215105 | Medium | Successful/unsuccessful uses of the init_module command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215058 | Medium | The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215059 | Medium | The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/security/opasswd. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215054 | Medium | The audit records must be off-loaded onto a different system or storage media from the system being audited. | Information stored in one location is vulnerable to accidental or incidental deletion or alteration.
Off-loading is a common process in information systems with limited audit storage capacity. |
| V-215087 | Medium | Successful/unsuccessful uses of the sudo command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215056 | Medium | The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/group. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215057 | Medium | The Ubuntu operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/gshadow. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215050 | Medium | Audit tools must have a mode of 0755 or less permissive. | Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized... |
| V-215051 | Medium | Audit tools must be owned by root. | Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized... |
| V-215052 | Medium | Audit tools must be group-owned by root. | Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized... |
| V-215086 | Medium | Successful/unsuccessful uses of the open_by_handle_at command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215119 | Medium | The Ubuntu operating system must implement non-executable data to protect its memory from unauthorized code execution. | Some adversaries launch attacks with the intent of executing code in non-executable regions of memory or in memory locations that are prohibited. Security safeguards employed to protect memory... |
| V-215118 | Medium | The Ubuntu operating system must record time stamps for audit records that can be mapped to Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT). | If time stamps are not consistently applied and there is no common time reference, it is difficult to perform forensic analysis.
Time stamps generated by the Ubuntu operating system include date... |
| V-215115 | Medium | A sticky bit must be set on all public directories to prevent unauthorized and unintended information transferred via shared system resources. | Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of... |
| V-215114 | Medium | The Ubuntu operating system must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the Ports, Protocols, and Services Management (PPSM) Category Assignments List (CAL) and vulnerability assessments. | In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must... |
| V-215117 | Medium | The Ubuntu operating system must synchronize internal information system clocks to the authoritative time source when the time difference is greater than one second. | Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when... |
| V-215116 | Medium | The Ubuntu operating system must compare internal information system clocks at least every 24 hours with a server which is synchronized to an authoritative time source, such as the 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). | Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when... |
| V-215111 | Medium | An application firewall must be installed. | Uncomplicated Firewall provides a easy and effective way to block/limit remote access to the system, via ports, services and protocols.
Remote access services, such as those providing remote... |
| V-215113 | Medium | An application firewall must employ a deny-all, allow-by-exception policy for allowing connections to other systems. | Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It also permits outbound connections that may facilitate exfiltration of DoD... |
| V-215112 | Medium | An application firewall must be enabled on the system. | Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network. |
| V-220333 | Medium | The system must update the DoD-approved virus scan program every seven days or more frequently. | Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems.
The virus scanning software should be... |
| V-215151 | Medium | The Ubuntu operating system must not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects by default. | Internet Control Message Protocol (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... |
| V-215049 | Medium | The audit log files must be owned by root. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215150 | Medium | The Ubuntu operating system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages. | Internet Control Message Protocol (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... |
| V-215047 | Medium | Audit log directory must be group-owned by root to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215046 | Medium | Audit log directory must be owned by root to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215045 | Medium | Audit logs must be group-owned by root to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215044 | Medium | Audit logs must be owned by root to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215043 | Medium | Audit log directories must have a mode of 0750 or less permissive to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215042 | Medium | Audit logs must have a mode of 0600 or less permissive to prevent unauthorized read access. | Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality.
Audit information includes all information (e.g., audit... |
| V-215041 | Medium | Off-loading audit records to another system must be authenticated. | Information stored in one location is vulnerable to accidental or incidental deletion or alteration.
Off-loading is a common process in information systems with limited audit storage capacity. |
| V-215024 | Medium | The /var/log/syslog file must be owned by syslog. | Only authorized personnel should be aware of errors and the details of the errors. Error messages are an indicator of an organization's operational state or can identify the Ubuntu operating... |
| V-215160 | Medium | An X Windows display manager must not be installed unless approved. | Internet services that are not required for system or application processes must not be active to decrease the attack surface of the system. X Windows has a long history of security... |
| V-215161 | Medium | The Ubuntu operating system must have the packages required for multifactor authentication to be installed. | Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect... |
| V-215162 | Medium | The Ubuntu operating system must accept Personal Identity Verification (PIV) credentials. | The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access.
DoD has mandated the use of the CAC to support identity management and personal authentication... |
| V-215163 | Medium | The Ubuntu operating system must implement certificate status checking for multifactor authentication. | Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect... |
| V-215164 | Medium | The Ubuntu operating system, for PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor. | Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted.
A trust anchor is an authoritative... |
| V-215165 | Medium | The Ubuntu operating system must implement smart card logins for multifactor authentication for access to accounts. | Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect... |
| V-215159 | Medium | If the Trivial File Transfer Protocol (TFTP) server is required, the TFTP daemon must be configured to operate in secure mode. | Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files. |
| V-214990 | Medium | Automatic mounting of Universal Serial Bus (USB) mass storage driver must be disabled. | Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity.
Peripherals include, but are not limited to, such devices as flash... |
| V-215040 | Medium | The remote audit system must take appropriate action when audit storage is full. | Information stored in one location is vulnerable to accidental or incidental deletion or alteration.
Off-loading is a common process in information systems with limited audit storage capacity. |
| V-214970 | Medium | Temporary user accounts must be provisioned with an expiration time of 72 hours or less. | 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-214971 | Medium | The Ubuntu operating system must enforce a delay of at least 4 seconds between logon prompts following a failed logon attempt. | Limiting the number of logon attempts over a certain time interval reduces the chances that an unauthorized user may gain access to an account. |
| V-215063 | Low | Successful/unsuccessful uses of the mount command must generate an audit record. | Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an... |
| V-215145 | Low | For Ubuntu operating systems using Domain Name Servers (DNS) resolution, at least two name servers must be configured. | To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name... |
| V-215018 | Low | The Ubuntu operating 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-215019 | Low | The Ubuntu operating 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-214946 | Low | The Ubuntu operating system must limit the number of concurrent sessions to ten for all accounts and/or account types. | Ubuntu operating system management includes the ability to control the number of users and user sessions that utilize an Ubuntu operating system. Limiting the number of allowed users and sessions... |
| V-214985 | Low | The file integrity tool must be configured to verify extended attributes. | Extended attributes in file systems are used to contain arbitrary data and file metadata with security implications. |
| V-214984 | Low | The file integrity tool must be configured to verify Access Control Lists (ACLs). | ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools. |
| V-214973 | Low | The Ubuntu operating system must display the date and time of the last successful account logon upon logon. | Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use. |
