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The Ubuntu operating system must generate audit records for successful/unsuccessful uses of the ssh-keysign command.


Finding ID Version Rule ID IA Controls Severity
V-238257 UBTU-20-010141 SV-238257r653946_rule Medium
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter).
Canonical Ubuntu 20.04 LTS Security Technical Implementation Guide 2022-12-06


Check Text ( C-41467r653944_chk )
Verify the Ubuntu operating system generates an audit record upon successful/unsuccessful attempts to use the "ssh-keysign" command.

Check the configured audit rules with the following commands:

$ sudo auditctl -l | grep ssh-keysign

-a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=-1 -k privileged-ssh

If the command does not return lines that match the example or the lines are commented out, this is a finding.

Note: The "-k" allows for specifying an arbitrary identifier, and the string after it does not need to match the example output above.
Fix Text (F-41426r653945_fix)
Configure the audit system to generate an audit event for any successful/unsuccessful use of the "ssh-keysign" command.

Add or update the following rules in the "/etc/audit/rules.d/stig.rules" file:

-a always,exit -F path=/usr/lib/openssh/ssh-keysign -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-ssh

To reload the rules file, issue the following command:

$ sudo augenrules --load