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Audit log files must be group-owned by wheel.


Overview

Finding ID Version Rule ID IA Controls Severity
V-67475 AOSX-11-000333 SV-81965r1_rule Medium
Description
The audit service must be configured to create log files with the correct group-ownership to prevent normal users from reading audit logs. Audit logs contain sensitive data about the system and about users. If log files are set to only be readable and writable by root or administrative users with sudo, the risk is mitigated.
STIG Date
Apple OS X 10.11 Security Technical Implementation Guide 2017-04-06

Details

Check Text ( C-68039r1_chk )
To check the group-ownership of the audit log files, run the following command:

/usr/bin/sudo ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control | awk -F: '{print $2}') | /usr/bin/grep -v current

The results should show the group owner (fourth column) to be "wheel". If not, this is a finding.
Fix Text (F-73589r1_fix)
For any log file that returns an incorrect group-owner, run the following command:

/usr/bin/sudo chgrp wheel [audit log file]

[audit log file] is the full path to the log file in question.