Title

The macOS system must be configured to audit all failed write actions on the system. (Cat II impact)

Discussion

The audit system must be configured to record enforcement actions of access restrictions, including failed file write (-fw) attempts. Enforcement actions are the methods or mechanisms used to prevent unauthorized access and/or changes to configuration settings. One common and effective enforcement action method is using access restrictions (e.g., denying users access to edit a file by applying file permissions). This configuration ensures that audit lists include events in which enforcement actions prevent attempts to change a file. Without auditing the enforcement of access restrictions, it is difficult to identify attempted attacks, as there is no audit trail available for forensic investigation. Satisfies: SRG-OS-000463-GPOS-00207,SRG-OS-000057-GPOS-00027,SRG-OS-000465-GPOS-00209,SRG-OS-000466-GPOS-00210,SRG-OS-000467-GPOS-00211,SRG-OS-000468-GPOS-00212

Check Content

Verify the macOS system is configured to audit all failed write actions on the system with the following command: /usr/bin/awk -F':' '/^flags/ { print $NF }' /etc/security/audit_control | /usr/bin/tr ',' '\n' | /usr/bin/grep -Ec '\-fw' If the result is not "1", this is a finding.

Fix Text

Configure the macOS system to audit all failed write actions on the system with the following command: /usr/bin/grep -qE "^flags.*-fw" /etc/security/audit_control || /usr/bin/sed -i.bak '/^flags/ s/$/,-fw/' /etc/security/audit_control;/usr/sbin/audit -s

Additional Identifiers

Rule ID: SV-259465r941017_rule

Vulnerability ID: V-259465

Group Title: SRG-OS-000463-GPOS-00207

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.