The macOS system must enforce session lock no more than five seconds after screen saver is started.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-259420	SRG-OS-000028-GPOS-00009	APPL-14-000003	SV-259420r958400_rule	2024-12-04	2

Description
A screen saver must be enabled and the system must be configured to require a password to unlock once the screensaver has been on for a maximum of five seconds. An unattended system with an excessive grace period is vulnerable to a malicious user.

ℹ️ Check
Verify the macOS system is configured to initiate a session lock within five seconds of the screen saver starting with the following command: /usr/bin/osascript -l JavaScript << EOS function run() { let delay = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.screensaver')\ .objectForKey('askForPasswordDelay')) if ( delay <= 5 ) { return("true") } else { return("false") } } EOS If the result is not "true", this is a finding.

ℹ️ Check

Verify the macOS system is configured to initiate a session lock within five seconds of the screen saver starting with the following command: /usr/bin/osascript -l JavaScript << EOS function run() { let delay = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.screensaver')\ .objectForKey('askForPasswordDelay')) if ( delay <= 5 ) { return("true") } else { return("false") } } EOS If the result is not "true", this is a finding.

✔️ Fix
Configure the macOS system to initiate a session lock within five seconds of the screen saver starting by installing the "com.apple.screensaver" configuration profile.