Check: UBTU-20-010038
Canonical Ubuntu 20.04 LTS STIG:
UBTU-20-010038
(in version v1 r12)
Title
The Ubuntu operating system must display the Standard Mandatory DOD Notice and Consent Banner before granting any local or remote connection to the system. (Cat II impact)
Discussion
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
Check Content
Verify the Ubuntu operating system displays the Standard Mandatory DOD Notice and Consent Banner before granting access to the Ubuntu operating system via an SSH logon with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*banner' /etc/ssh/sshd_config:Banner /etc/issue.net The command will return the banner option along with the name of the file that contains the SSH banner. If the line is commented out, this is a finding. If conflicting results are returned, this is a finding. Verify the specified banner file matches the Standard Mandatory DOD Notice and Consent Banner exactly: $ cat /etc/issue.net "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." If the banner text does not match the Standard Mandatory DOD Notice and Consent Banner exactly, this is a finding.
Fix Text
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
Additional Identifiers
Rule ID: SV-238214r951471_rule
Vulnerability ID: V-238214
Group Title: SRG-OS-000228-GPOS-00088
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000048 |
The information system displays an organization-defined system use notification message or banner before granting access to the system that provides privacy and security notices consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. |
CCI-001384 |
The information system, for publicly accessible systems, displays system use information organization-defined conditions before granting further access. |
CCI-001385 |
The information system, for publicly accessible systems, displays references, if any, to monitoring that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
CCI-001386 |
The information system, for publicly accessible systems, displays references, if any, to recording that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
CCI-001387 |
The information system, for publicly accessible systems, displays references, if any, to auditing that are consistent with privacy accommodations for such systems that generally prohibit those activities. |
CCI-001388 |
The information system, for publicly accessible systems, includes a description of the authorized uses of the system. |
Controls
Number | Title |
---|---|
AC-8 |
System Use Notification |