All uses of the unix_chkpwd command must be audited.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Associated with: CCI-000135 CCI-000172 CCI-002884

SV-86775r4_rule All uses of the unix_chkpwd command must be audited.

Vulnerability discussion

Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.At a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.Satisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215

Check content

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur. Check the file system rule in "/etc/audit/audit.rules" with the following command: # grep -i /sbin/unix_chkpwd /etc/audit/audit.rules -a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd If the command does not return any output, this is a finding.

Fix text

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "unix_chkpwd" command occur. Add or update the following rule in "/etc/audit/rules.d/audit.rules": -a always,exit -F path=/usr/sbin/unix_chkpwd -F perm=x -F auid>=1000 -F auid!=4294967295 -k privileged-passwd The audit daemon must be restarted for the changes to take effect.

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