The macOS system must be configured so that log files must not contain access control lists (ACLs).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-81551	AOSX-13-000337	SV-96265r1_rule		Medium

Description
The audit service must be configured to create log files with the correct permissions to prevent regular users from reading audit logs. Audit logs contain sensitive data about the system and users. If log files are set to be readable and writable only by root or administrative users with sudo, the risk is mitigated.

STIG	Date
Apple OS X 10.13 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-81301r1_chk )
To check if a log file contains ACLs, run the following commands: /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 In the output from the above commands, ACLs will be listed under any file that may contain them (e.g., "0: group:admin allow list,readattr,reaadextattr,readsecurity"). If any such line exists, this is a finding.

Check Text ( C-81301r1_chk )

To check if a log file contains ACLs, run the following commands:

/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

In the output from the above commands, ACLs will be listed under any file that may contain them (e.g., "0: group:admin allow list,readattr,reaadextattr,readsecurity").

If any such line exists, this is a finding.

Fix Text (F-88377r1_fix)
For any log file that contains ACLs, run the following command: /usr/bin/sudo chmod -N [audit log file]