Title

The macOS system must enforce screen saver timeout. (Cat II impact)

Discussion

The screen saver timeout must be set to 900 seconds or a shorter length of time. This rule ensures that a full session lock is triggered within no more than 900 seconds of inactivity.

Check Content

Verify the macOS system is configured to initiate the screen saver timeout after 15 minutes of inactivity with the following command: /usr/bin/osascript -l JavaScript << EOS function run() { let timeout = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.screensaver')\ .objectForKey('idleTime')) if ( timeout <= 900 ) { return("true") } else { return("false") } } EOS If the result is not "true", this is a finding.

Fix Text

Configure the macOS system to initiate the screen saver after 15 minutes of inactivity by installing the "com.apple.screensaver" configuration profile.

Additional Identifiers

Rule ID: SV-259441r940945_rule

Vulnerability ID: V-259441

Group Title: SRG-OS-000029-GPOS-00010

Expert Comments

CCIs tied to check.

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