STIGQter: STIG Summary: Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The Ubuntu operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting any publically accessible connection to the system.

DISA Rule

SV-219170r610963_rule

Vulnerability Number

V-219170

Group Title

SRG-OS-000228-GPOS-00088

Rule Version

UBTU-18-010038

Severity

CAT II

CCI(s)

• 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.
• 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.

Weight

10

Fix Recommendation

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

Edit the SSH daemon configuration "/etc/ssh/sshd_config" file. Uncomment the banner keyword and configure it to point to the file that contains the correct banner. An example of this configure is below:

Banner /etc/issue

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."

In order for the changes to take effect, the SSH daemon must be restarted.

# sudo systemctl restart sshd.service

Check Contents

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

Check that the Ubuntu operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the Ubuntu operating system via a ssh logon with the following command:

# grep -i banner /etc/ssh/sshd_config

Banner /etc/issue

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.

Check the specified banner file to check that it matches the Standard Mandatory DoD Notice and Consent Banner exactly:

# cat /etc/issue

“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.

Vulnerability Number

V-219170

Documentable

False

Rule Version

UBTU-18-010038

Severity Override Guidance

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

Check that the Ubuntu operating system displays the Standard Mandatory DoD Notice and Consent Banner before granting access to the Ubuntu operating system via a ssh logon with the following command:

# grep -i banner /etc/ssh/sshd_config

Banner /etc/issue

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.

Check the specified banner file to check that it matches the Standard Mandatory DoD Notice and Consent Banner exactly:

# cat /etc/issue

“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.

Check Content Reference

M

Target Key

4055

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