Canonical Ubuntu 16.04 Security Technical Implementation Guide

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: [email protected]

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Version / Release: V1R4

Published: 2020-03-24

Updated At: 2020-05-11 21:03:20

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Drop CKL or SCAP (XCCDF) results here.

    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-90069r1_rule UBTU-16-010000 CCI-001230 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 security issues discovered in the system software.
    SV-90071r5_rule UBTU-16-010010 CCI-000366 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 and application software patched is a common mistake made by
    SV-90073r3_rule UBTU-16-010020 CCI-000048 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 federal laws, Executive Orders, directives, policies, regul
    SV-90115r3_rule UBTU-16-010030 CCI-000048 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 federal laws, Executive Orders, directives, policies, regul
    SV-90117r4_rule UBTU-16-010040 CCI-000056 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 temporary nature of the absence. The session lock is implemented a
    SV-90119r2_rule UBTU-16-010050 CCI-000056 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 temporary nature of the absence. The session lock is implemented a
    SV-90121r2_rule UBTU-16-010060 CCI-000057 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 prevent anyone from gaining access to the machine while the u
    SV-90123r2_rule UBTU-16-010070 CCI-000054 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 per user is helpful in reducing the risks related to DoS at
    SV-90125r3_rule UBTU-16-010080 CCI-000770 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 multiple individuals. Use of a group authenticator alone does
    SV-90129r3_rule UBTU-16-010100 CCI-000192 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 resisting attempts at guessing and brute-force attacks. Password
    SV-90131r3_rule UBTU-16-010110 CCI-000193 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 resisting attempts at guessing and brute-force attacks. Password
    SV-90133r3_rule UBTU-16-010120 CCI-000194 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 resisting attempts at guessing and brute-force attacks. Password
    SV-90135r3_rule UBTU-16-010130 CCI-001619 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 attempts at guessing and brute-force attacks. Password co
    SV-90137r3_rule UBTU-16-010140 CCI-000195 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 attempts at guessing and brute-force attacks. The number
    SV-90139r1_rule UBTU-16-010150 CCI-000196 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 compromised. Unapproved mechanisms that are used for authe
    SV-90141r1_rule UBTU-16-010160 CCI-000196 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 protected at all times, and encryption is the standard method fo
    SV-90143r2_rule UBTU-16-010170 CCI-000196 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 protected at all times, and encryption is the standard method fo
    SV-90145r2_rule UBTU-16-010180 CCI-000803 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 compromised. Ubuntu operating systems utilizing encryptio
    SV-90149r1_rule UBTU-16-010200 CCI-001682 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 may bypass normal account authorization processes. If these a
    SV-90151r3_rule UBTU-16-010210 CCI-000198 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 continually change their password, then the password could be repeate
    SV-90153r2_rule UBTU-16-010220 CCI-000199 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 force users to change their passwords, there is the risk that
    SV-90155r2_rule UBTU-16-010230 CCI-000200 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 user to consecutively reuse their password when that password
    SV-90157r3_rule UBTU-16-010240 CCI-000205 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 effectiveness of a password in resisting attempts at guessing and bru
    SV-90159r2_rule UBTU-16-010250 CCI-000366 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.
    SV-90161r4_rule UBTU-16-010260 CCI-000366 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 and brute-force attacks.
    SV-90163r1_rule UBTU-16-010270 CCI-000366 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 and brute-force attacks.
    SV-90165r3_rule UBTU-16-010280 CCI-000795 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 accounts will not notice if unauthorized access to their user acco
    SV-90167r3_rule UBTU-16-010290 CCI-000044 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 account. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-00032
    SV-90169r2_rule UBTU-16-010300 CCI-002038 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 capability or change security roles, it is critical the user r
    SV-90171r1_rule UBTU-16-010310 CCI-000016 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 all temporary accounts must be set upon account creation. T
    SV-90173r1_rule UBTU-16-010320 CCI-000366 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.
    SV-90175r4_rule UBTU-16-010330 CCI-000366 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.
    SV-90177r1_rule UBTU-16-010340 CCI-000366 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.
    SV-90179r1_rule UBTU-16-010350 CCI-000366 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 system, as it does not require interactive identification a
    SV-90181r2_rule UBTU-16-010360 CCI-000366 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 does not require interactive identification and authenticati
    SV-90183r2_rule UBTU-16-010370 CCI-002450 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 higher standards approved by the federal government since this
    SV-90185r4_rule UBTU-16-010380 CCI-000213 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 be properly configured to incorporate access control methods
    SV-90187r3_rule UBTU-16-010390 CCI-000213 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 be properly configured to incorporate access control methods
    SV-90189r1_rule UBTU-16-010400 CCI-001199 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 rest. Selection of a cryptographic mechanism is based on the need t
    SV-90191r1_rule UBTU-16-010410 CCI-001090 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 processes acting on behalf of prior users/roles) from bein
    SV-90193r3_rule UBTU-16-010420 CCI-001090 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 authorized public directories are those temporary directories s
    SV-90195r3_rule UBTU-16-010500 CCI-002696 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 firmware of the information system responsible for enforcing the
    SV-90197r2_rule UBTU-16-010510 CCI-002699 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 firmware of the information system responsible for enforcing the
    SV-90199r3_rule UBTU-16-010520 CCI-000366 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.
    SV-90201r1_rule UBTU-16-010530 CCI-000366 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.
    SV-90203r4_rule UBTU-16-010540 CCI-001744 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 system configurations can have unintended side effects, some of
    SV-90205r2_rule UBTU-16-010550 CCI-001496 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 records, audit settings, and audit reports) needed to successfu
    SV-90207r2_rule UBTU-16-010560 CCI-001749 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 has been provided by a trusted vendor. Accordingly, patch
    SV-90209r1_rule UBTU-16-010570 CCI-002617 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 may remove older versions of software automatically from the
    SV-90211r2_rule UBTU-16-010580 CCI-001958 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 drives, external storage, and printers.
    SV-90213r2_rule UBTU-16-010590 CCI-000366 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, SRG-OS-000480-GPOS-00227
    SV-90215r2_rule UBTU-16-010600 CCI-002165 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 which mode (e.g., read or write). Ownership is usually acquired
    SV-90217r2_rule UBTU-16-010610 CCI-001764 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 organizational information systems is commonly referred to as whiteli
    SV-90221r3_rule UBTU-16-010630 CCI-000366 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 the risk of short-term loss of availability of systems due to
    SV-90223r2_rule UBTU-16-010640 CCI-000366 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.
    SV-90225r2_rule UBTU-16-010650 CCI-000366 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 application accounts for applications not installed on the
    SV-90227r2_rule UBTU-16-010660 CCI-000764 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 include organizational employees or individuals the organizati
    SV-90229r1_rule UBTU-16-010670 CCI-000366 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 a UID of "0" afford an opportunity for potential intruders
    SV-90231r1_rule UBTU-16-010680 CCI-002041 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 password upon initial logon. Temporary passwords are typicall
    SV-90233r2_rule UBTU-16-010690 CCI-002007 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.
    SV-90235r1_rule UBTU-16-010700 CCI-002165 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.
    SV-90237r1_rule UBTU-16-010710 CCI-002165 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.
    SV-90239r1_rule UBTU-16-010720 CCI-000366 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.
    SV-90241r1_rule UBTU-16-010730 CCI-000366 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.
    SV-90243r1_rule UBTU-16-010740 CCI-000366 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 Denial of Service because the user would not be able to access t
    SV-90245r1_rule UBTU-16-010750 CCI-000366 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.
    SV-90247r1_rule UBTU-16-010760 CCI-000366 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 share the same group may not be able to access files th
    SV-90249r1_rule UBTU-16-010770 CCI-000366 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.
    SV-90251r1_rule UBTU-16-010780 CCI-000366 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 executables in these directories may be executed instead o
    SV-90253r1_rule UBTU-16-010790 CCI-000366 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 user level. If the system is compromised at the user level, i
    SV-90255r2_rule UBTU-16-010800 CCI-000366 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 setguid files. Executing files from untrusted file systems i
    SV-90257r3_rule UBTU-16-010810 CCI-000366 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" and "setguid" files. Executing files from untrusted file s
    SV-90259r3_rule UBTU-16-010820 CCI-000366 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" and "setguid" files. Executing files from untrusted file s
    SV-90261r2_rule UBTU-16-010830 CCI-000366 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. Executing files from untrusted file systems increases the oppo
    SV-90265r1_rule UBTU-16-010900 CCI-000366 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 exhausting the available space on the target file system pa
    SV-90267r2_rule UBTU-16-010910 CCI-000366 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.
    SV-90269r1_rule UBTU-16-010920 CCI-000366 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.
    SV-90271r1_rule UBTU-16-010930 CCI-000366 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.
    SV-90273r2_rule UBTU-16-010940 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90275r2_rule UBTU-16-010950 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90277r3_rule UBTU-16-010960 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90279r2_rule UBTU-16-010970 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90281r2_rule UBTU-16-010980 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90283r4_rule UBTU-16-010990 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90285r2_rule UBTU-16-011000 CCI-001499 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 are part of a robust change management process. This requir
    SV-90287r2_rule UBTU-16-011010 CCI-001499 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 are part of a robust change management process. This requir
    SV-90289r2_rule UBTU-16-011020 CCI-001499 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 are part of a robust change management process. This requir
    SV-90291r2_rule UBTU-16-011030 CCI-001499 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 are part of a robust change management process. This requir
    SV-90293r2_rule UBTU-16-011040 CCI-001499 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 are part of a robust change management process. This requir
    SV-90295r2_rule UBTU-16-011050 CCI-001499 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 are part of a robust change management process. This requir
    SV-90297r1_rule UBTU-16-020000 CCI-000130 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 leading up to an outage or attack. Audit record content t
    SV-90301r2_rule UBTU-16-020020 CCI-001849 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 capacity. The task of allocating audit record storage capacity is u
    SV-90303r2_rule UBTU-16-020030 CCI-001855 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.
    SV-90305r2_rule UBTU-16-020040 CCI-000139 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 impending failure of the audit capability, and system oper
    SV-90307r1_rule UBTU-16-020050 CCI-000140 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: software/hardware errors; failures in the audit capturing mechanisms;
    SV-90309r2_rule UBTU-16-020060 CCI-000140 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: software/hardware errors; failures in the audit capturing mechanisms;
    SV-90311r2_rule UBTU-16-020070 CCI-001851 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.
    SV-90313r1_rule UBTU-16-020080 CCI-001851 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.
    SV-90315r3_rule UBTU-16-020090 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90317r2_rule UBTU-16-020100 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90319r2_rule UBTU-16-020110 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90321r2_rule UBTU-16-020120 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90323r2_rule UBTU-16-020130 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90325r2_rule UBTU-16-020140 CCI-000162 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 records, audit settings, audit reports) needed to successfully
    SV-90327r1_rule UBTU-16-020150 CCI-000171 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 audits may degrade the system's performance by overwhelming th
    SV-90329r2_rule UBTU-16-020160 CCI-001314 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 system or platform. Additionally, Personally Identifiable Inform
    SV-90333r2_rule UBTU-16-020180 CCI-001493 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 operation on audit information. Ubuntu operating systems providin
    SV-90335r2_rule UBTU-16-020190 CCI-001493 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 operation on audit information. Ubuntu operating systems providin
    SV-90337r2_rule UBTU-16-020200 CCI-001493 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 operation on audit information. Ubuntu operating systems providin
    SV-90339r2_rule UBTU-16-020210 CCI-001851 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.
    SV-90341r4_rule UBTU-16-020300 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90343r4_rule UBTU-16-020310 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90345r4_rule UBTU-16-020320 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90347r4_rule UBTU-16-020330 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90367r4_rule UBTU-16-020340 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90371r5_rule UBTU-16-020360 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90373r5_rule UBTU-16-020370 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90375r5_rule UBTU-16-020380 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90377r5_rule UBTU-16-020390 CCI-000135 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 incident or identify those responsible for one. Audit recor
    SV-90379r5_rule UBTU-16-020400 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90387r5_rule UBTU-16-020410 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90395r2_rule UBTU-16-020450 CCI-000130 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 records can be generated from various components within the i
    SV-90397r3_rule UBTU-16-020460 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90399r3_rule UBTU-16-020470 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90401r3_rule UBTU-16-020480 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90403r3_rule UBTU-16-020490 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90405r3_rule UBTU-16-020500 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90407r4_rule UBTU-16-020510 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90409r4_rule UBTU-16-020520 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90411r4_rule UBTU-16-020530 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90413r4_rule UBTU-16-020540 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90415r4_rule UBTU-16-020550 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90417r3_rule UBTU-16-020560 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90419r3_rule UBTU-16-020570 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90421r4_rule UBTU-16-020580 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90423r4_rule UBTU-16-020590 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90425r4_rule UBTU-16-020600 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90427r4_rule UBTU-16-020610 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90429r4_rule UBTU-16-020620 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90431r4_rule UBTU-16-020630 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90433r4_rule UBTU-16-020640 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90435r5_rule UBTU-16-020650 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90439r5_rule UBTU-16-020670 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90441r6_rule UBTU-16-020680 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90445r5_rule UBTU-16-020700 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90447r5_rule UBTU-16-020710 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90449r5_rule UBTU-16-020720 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90451r3_rule UBTU-16-020730 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90453r3_rule UBTU-16-020740 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90455r3_rule UBTU-16-020750 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90457r5_rule UBTU-16-020760 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90459r3_rule UBTU-16-020770 CCI-000130 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 privileged commands. The organization must maintain audit trail
    SV-90461r5_rule UBTU-16-020780 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90463r5_rule UBTU-16-020790 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90465r5_rule UBTU-16-020800 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90467r5_rule UBTU-16-020810 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90469r5_rule UBTU-16-020820 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-90471r4_rule UBTU-16-020830 CCI-000130 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 incident or identify those responsible for one. Audit reco
    SV-90473r4_rule UBTU-16-020840 CCI-000130 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 incident or identify those responsible for one. Audit reco
    SV-90475r4_rule UBTU-16-020850 CCI-000130 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 incident or identify those responsible for one. Audit reco
    SV-90477r3_rule UBTU-16-030000 CCI-000197 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 overlooked and therefore may remain unsecured. They increase
    SV-90479r2_rule UBTU-16-030010 CCI-000381 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.
    SV-90481r2_rule UBTU-16-030020 CCI-000381 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 overlooked and therefore may remain unsecured. They increase
    SV-90483r2_rule UBTU-16-030030 CCI-002314 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 access to network devices and information systems, which lack a
    SV-90485r2_rule UBTU-16-030040 CCI-000366 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.
    SV-90487r2_rule UBTU-16-030050 CCI-000366 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 data. Satisfies: SRG-OS-000297-GPOS-00115, SRG-OS-000480-
    SV-90489r2_rule UBTU-16-030060 CCI-000382 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 disable or restrict unused or unnecessary physical and logical po
    SV-90491r4_rule UBTU-16-030070 CCI-001090 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 processes acting on behalf of prior users/roles) from bein
    SV-90493r3_rule UBTU-16-030100 CCI-001891 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 conducting forensic analysis and investigating system events. S
    SV-90495r2_rule UBTU-16-030110 CCI-002046 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 conducting forensic analysis and investigating system events.
    SV-90497r2_rule UBTU-16-030120 CCI-001890 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 and time. Time is commonly expressed in Coordinated Univers
    SV-90499r2_rule UBTU-16-030130 CCI-002824 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 include, for example, data execution prevention and address sp
    SV-90501r2_rule UBTU-16-030140 CCI-002824 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 include, for example, data execution prevention and address sp
    SV-90503r1_rule UBTU-16-030200 CCI-001941 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 credentials must not be vulnerable to a replay attack. An
    SV-90505r5_rule UBTU-16-030210 CCI-000048 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 federal laws, Executive Orders, directives, policies, regul
    SV-90507r2_rule UBTU-16-030220 CCI-000366 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 user-specific account provides individual accountability of actio
    SV-90509r3_rule UBTU-16-030230 CCI-000068 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 systems by an authorized user (or an information system) co
    SV-90511r2_rule UBTU-16-030240 CCI-001453 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 authorized user (or an information system) communicating throu
    SV-90513r3_rule UBTU-16-030250 CCI-000366 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.
    SV-90515r2_rule UBTU-16-030260 CCI-000366 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.
    SV-90517r3_rule UBTU-16-030270 CCI-000879 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 (i.e., network disconnect). A logical session (for local, net
    SV-90521r2_rule UBTU-16-030300 CCI-000366 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.
    SV-90523r2_rule UBTU-16-030310 CCI-000366 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.
    SV-90525r2_rule UBTU-16-030320 CCI-000366 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.
    SV-90527r2_rule UBTU-16-030330 CCI-000366 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.
    SV-90529r2_rule UBTU-16-030340 CCI-000366 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.
    SV-90531r2_rule UBTU-16-030350 CCI-000366 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, potentially with root privileges.
    SV-90533r2_rule UBTU-16-030400 CCI-000366 HIGH Remote X connections for interactive users must be encrypted. Open X displays allow an attacker to capture keystrokes and execute commands remotely.
    SV-90535r1_rule UBTU-16-030410 CCI-002385 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 requirement addresses the configuration of the Ubuntu operating s
    SV-90537r1_rule UBTU-16-030420 CCI-002418 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 requirement applies to both internal and external networks and all
    SV-90539r2_rule UBTU-16-030430 CCI-001851 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.
    SV-90543r2_rule UBTU-16-030450 CCI-000067 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 management difficult at best. Remote access is access to DoD
    SV-90545r2_rule UBTU-16-030460 CCI-000366 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.
    SV-90547r1_rule UBTU-16-030500 CCI-001443 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 used to compromise the Ubuntu operating system. This requi
    SV-90549r2_rule UBTU-16-030510 CCI-001095 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 excess capacity ensures that sufficient capacity is availabl
    SV-90551r2_rule UBTU-16-030520 CCI-000366 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 resolution, which may include time synchronization, centralized
    SV-90553r3_rule UBTU-16-030530 CCI-000366 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 measures. This requirement applies only to the forwarding of
    SV-90555r3_rule UBTU-16-030540 CCI-000366 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 measures. This requirement applies only to the forwarding of
    SV-90557r2_rule UBTU-16-030550 CCI-000366 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.
    SV-90559r3_rule UBTU-16-030560 CCI-000366 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 table and are unauthenticated. An illicit ICMP redirect mes
    SV-90561r2_rule UBTU-16-030570 CCI-000366 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 table and are unauthenticated. An illicit ICMP redirect mes
    SV-90563r2_rule UBTU-16-030580 CCI-000366 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 the system's route table, possibly revealing portions of t
    SV-90565r2_rule UBTU-16-030590 CCI-000366 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 the system's route table, possibly revealing portions of t
    SV-90567r2_rule UBTU-16-030600 CCI-000366 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 unnecessarily transmitted across the network.
    SV-90569r2_rule UBTU-16-030610 CCI-000366 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 information such as logon IDs, passwords, and key exchanges
    SV-90571r2_rule UBTU-16-030620 CCI-000366 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.
    SV-90573r2_rule UBTU-16-030700 CCI-000139 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 impending failure of the audit capability, and system oper
    SV-90575r2_rule UBTU-16-030710 CCI-000366 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 this service, the privileged user password could be compro
    SV-90577r3_rule UBTU-16-030720 CCI-000318 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 authorized personnel, and have access control rules establis
    SV-90579r1_rule UBTU-16-030730 CCI-000366 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.
    SV-90581r1_rule UBTU-16-030740 CCI-000366 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 vulnerabilities and will not be used unless approved and documented.
    SV-90583r1_rule UBTU-16-030800 CCI-001948 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 credentials stored on the authentication device. Multifactor
    SV-90585r1_rule UBTU-16-030810 CCI-001953 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 for systems covered under Homeland Security Presidential Di
    SV-90587r2_rule UBTU-16-030820 CCI-001948 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 credentials stored on the authentication device. Multifactor
    SV-90589r2_rule UBTU-16-030830 CCI-000185 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 entity represented via a public key and associated data. It is
    SV-90591r1_rule UBTU-16-030840 CCI-000765 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 credentials stored on the authentication device. Multifactor
    SV-92701r1_rule UBTU-16-030900 CCI-001668 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 configured to perform scans dynamically on accessed files. If th
    SV-92703r1_rule UBTU-16-030910 CCI-001668 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 configured to check for software and virus definition updates wi
    SV-95669r2_rule UBTU-16-010631 CCI-000366 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 the risk of short-term loss of availability of systems due to
    SV-95671r1_rule UBTU-16-020010 CCI-000366 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 security baseline across DoD that reflects the most restrictiv
    SV-95673r1_rule UBTU-16-020021 CCI-001855 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.
    SV-95677r1_rule UBTU-16-020220 CCI-001851 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.
    SV-95681r3_rule UBTU-16-020690 CCI-000130 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 incident or identify those responsible for one. Audit recor
    SV-101001r1_rule UBTU-16-010291 CCI-002238 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.
    SV-101003r1_rule UBTU-16-030271 CCI-000879 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 (i.e., network disconnect). A logical session (for local, net
    SV-101013r1_rule UBTU-16-020651 CCI-000130 MEDIUM The Ubuntu operating system must generate audit records for all uses of the su command. 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 incident or identify those responsible. Audit records can b
    SV-101015r1_rule UBTU-16-020350 CCI-002233 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 and ongoing concern and can have significant adverse impacts
    SV-108093r1_rule UBTU-16-030251 CCI-000366 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.
    SV-108113r1_rule UBTU-16-010099 CCI-000192 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 resisting attempts at guessing and brute-force attacks. "pwquality