STIGQter STIGQter: STIG Summary: Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

Ubuntu 22.04 LTS must display the Standard Mandatory DOD Notice and Consent Banner before granting local access to the system via a graphical user logon.

DISA Rule

SV-260536r958390_rule

Vulnerability Number

V-260536

Group Title

SRG-OS-000023-GPOS-00006

Rule Version

UBTU-22-271015

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Edit the "/etc/gdm3/greeter.dconf-defaults" file.

Set the "banner-message-text" line to contain the appropriate banner message text as shown below:

banner-message-text="You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

Update GDM with the new configuration by using the following commands:

$ sudo dconf update

$ sudo systemctl restart gdm3

Check Contents

Verify Ubuntu 22.04 LTS displays the Standard Mandatory DOD Notice and Consent Banner before granting access to the operating system via a graphical user logon with the command:

Note: If no graphical user interface is installed, this requirement is not applicable.

$ grep -i banner-message-text /etc/gdm3/greeter.dconf-defaults

banner-message-text="You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

If the banner-message-text is missing, commented out, or does not match the Standard Mandatory DOD Notice and Consent Banner exactly, this is a finding.

Vulnerability Number

V-260536

Documentable

False

Rule Version

UBTU-22-271015

Severity Override Guidance

Verify Ubuntu 22.04 LTS displays the Standard Mandatory DOD Notice and Consent Banner before granting access to the operating system via a graphical user logon with the command:

Note: If no graphical user interface is installed, this requirement is not applicable.

$ grep -i banner-message-text /etc/gdm3/greeter.dconf-defaults

banner-message-text="You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details."

If the banner-message-text is missing, commented out, or does not match the Standard Mandatory DOD Notice and Consent Banner exactly, this is a finding.

Check Content Reference

M

Target Key

5594