Detections
Analytics

UBTU-20-010038 - The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting any local or remote connection to the system - sshd_config

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Information

Display of a standardized and approved use notification before granting access to the publicly accessible 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 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 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-000228-GPOS-00088, SRG-OS-000023-GPOS-00006

Solution

Set the parameter Banner in '/etc/ssh/sshd_config' to point to the '/etc/issue.net' file:

$ sudo sed -i '/^Banner/d' /etc/ssh/sshd_config
$ sudo sed -i '$aBanner /etc/issue.net' /etc/ssh/sshd_config

Either create the file containing the banner or replace the text in the file with the Standard Mandatory DoD Notice and Consent Banner. The DoD required text is:

'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.'

Restart the SSH daemon for the changes to take effect and then signal the SSH server to reload the configuration file:

$ sudo systemctl -s SIGHUP kill sshd

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_20-04_LTS_V1R5_STIG.zip

Item Details

References: CAT|II, CCI|CCI-000048, CCI|CCI-001384, CCI|CCI-001385, CCI|CCI-001386, CCI|CCI-001387, CCI|CCI-001388, Rule-ID|SV-238214r832938_rule, STIG-ID|UBTU-20-010038, Vuln-ID|V-238214

Plugin: Unix

Control ID: a79727406e1d0596a81516fa1c07ca7da1da254702aa24bd71cfe0ecd50ae0ac