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.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75393	UBTU-16-010020	SV-90073r3_rule		Medium

Description
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, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for Ubuntu operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -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. -At any time, the USG may inspect and seize data stored on this IS. -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. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -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." Use the following verbiage for Ubuntu operating systems that have severe limitations on the number of characters that can be displayed in the banner: "I've read & consent to terms in IS user agreem't." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088

Description

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, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for Ubuntu operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -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. -At any time, the USG may inspect and seize data stored on this IS. -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. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -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." Use the following verbiage for Ubuntu operating systems that have severe limitations on the number of characters that can be displayed in the banner: "I've read & consent to terms in IS user agreem't." Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2019-12-23

Details

Check Text ( C-75137r3_chk )
Verify the Ubuntu operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the Ubuntu operating system via a Gnome graphical user logon. Note: If the system does not have a graphical user logon this item is Not Applicable. Note: If the system is using lightdm, this is a finding. There is no greater configuration that can be applied to meet the requirement. Check that the Ubuntu operating system displays a banner at the logon screen with the following command: # grep banner-message-enable /etc/dconf/db/local.d/* banner-message-enable=true If "banner-message-enable" is not set to "true", is missing, set to "false", or is commented out, this is a finding.

Check Text ( C-75137r3_chk )

Verify the Ubuntu operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the Ubuntu operating system via a Gnome graphical user logon.

Note: If the system does not have a graphical user logon this item is Not Applicable.

Note: If the system is using lightdm, this is a finding. There is no greater configuration that can be applied to meet the requirement.

Check that the Ubuntu operating system displays a banner at the logon screen with the following command:

# grep banner-message-enable /etc/dconf/db/local.d/*
banner-message-enable=true

If "banner-message-enable" is not set to "true", is missing, set to "false", or is commented out, this is a finding.

Fix Text (F-82021r1_fix)
Configure the Ubuntu operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system. Create a database that will contain the system wide graphical user logon settings (if it does not already exist) with the following command: # sudo touch /etc/dconf/db/local.d/01-banner-message Add the following line to the "[org/gnome/login-screen]" section of the "/etc/dconf/db/local.d/01-banner-message" file: [org/gnome/login-screen] banner-message-enable=true

Fix Text (F-82021r1_fix)

Configure the Ubuntu operating system to display the Standard Mandatory DoD Notice and Consent Banner before granting access to the system.

Create a database that will contain the system wide graphical user logon settings (if it does not already exist) with the following command:

# sudo touch /etc/dconf/db/local.d/01-banner-message

Add the following line to the "[org/gnome/login-screen]" section of the "/etc/dconf/db/local.d/01-banner-message" file:

[org/gnome/login-screen]
banner-message-enable=true