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).
Satisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218
Check
Verify the Ubuntu operating system generates an audit record when successful/unsuccessful modifications to the "lastlog" file occur.
Check the currently configured audit rules with the following command:
$ sudo auditctl -l | grep lastlog
-w /var/log/lastlog -p wa -k logins
If the command does not return a line that matches the example or the line is 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
Configure the audit system to generate an audit event for any successful/unsuccessful modifications to the "lastlog" file.
Add or update the following rules in the "/etc/audit/rules.d/stig.rules" file:
-w /var/log/lastlog -p wa -k logins
To reload the rules file, issue the following command:
$ sudo augenrules --load