Vulnerability Discussion

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).

Check

Verify Ubuntu 22.04 LTS generates audit records upon successful/unsuccessful attempts to use the "su" command by using the following command:

$ sudo auditctl -l | grep /bin/su
-a always,exit -S all -F path=/bin/su -F perm=x -F auid>=1000 -F auid!=-1 -F key=privileged-priv_change

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

Note: The "key=" value is arbitrary and can be different from the example output above.

Fix

Configure Ubuntu 22.04 LTS to generate audit records when successful/unsuccessful attempts to use the "su" command occur.

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

-a always,exit -F path=/bin/su -F perm=x -F auid>=1000 -F auid!=unset -k privileged-priv_change

To reload the rules file, issue the following command:

$ sudo augenrules --load

Note: The "-k " at the end of the line gives the rule a unique meaning to help during an audit investigation. The does not need to match the example above.