From Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide
Part of SRG-OS-000037-GPOS-00015
Associated with: CCI-000130 CCI-000135 CCI-000169 CCI-000172 CCI-002884
Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.
Verify the Ubuntu operating system generates an audit record when successful/unsuccessful attempts to use the "chsh" command occur. Check that the following calls are being audited by performing the following command to check the file system rules in "/etc/audit/audit.rules": # sudo grep -w chsh /etc/audit/audit.rules -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k priv_cmd If the command does not return a line, or the line is commented out, this is a finding.
Configure the audit system to generate an audit event for any successful/unsuccessful use of the "chsh" command. Add or update the following rules in the "/etc/audit/audit.rules" file: -a always,exit -F path=/usr/bin/chsh -F perm=x -F auid>=1000 -F auid!=4294967295 -k priv_cmd The audit daemon must be restarted for the changes to take effect. To restart the audit daemon, run the following command: # sudo systemctl restart auditd.service
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