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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257158	APPL-13-000030	SV-257158r905107_rule		Medium

Description
The audit service must be configured to create log files with the correct permissions to prevent normal 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. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000206-GPOS-00084

STIG	Date
Apple macOS 13 (Ventura) Security Technical Implementation Guide	2023-04-12

Details

Check Text ( C-60843r905105_chk )
Verify the macOS system is configured without ACLs applied to log files with the following command: /usr/bin/sudo /bin/ls -le $(/usr/bin/sudo /usr/bin/grep '^dir' /etc/security/audit_control \| /usr/bin/awk -F: '{print $2}') \| /usr/bin/grep -v current In the output from the above command, ACLs will be listed under any file that may contain them (e.g., "0: group:admin allow list,readattr,readextattr,readsecurity"). If any ACLs exists, this is a finding.

Check Text ( C-60843r905105_chk )

Verify the macOS system is configured without ACLs applied to log files with the following command:

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

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

If any ACLs exists, this is a finding.

Fix Text (F-60784r905106_fix)
Configure the macOS system so that log files do not contain ACLs with the following command: /usr/bin/sudo /bin/chmod -N [audit log file]