Ensure a Custom Message for the Login Screen Is Enabled

How it is checked

Audit method: Shell command

/usr/bin/osascript -l JavaScript <<'EOS'
function run() {
  let msg = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.loginwindow').objectForKey('LoginwindowText'))
  if ( msg != null && String(msg).trim().length > 0 ) {
    return("true")
  } else {
    return("false")
  }
}
EOS

Expected output

true

How it is fixed

Fix method: Guidance or infrastructure patch

Profile (preferred): com.apple.loginwindow LoginwindowText = <string><Your organization's required. Terminal: sudo /usr/bin/defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "<custom message>" ; sudo /usr/bin/defaults write /Library/Preferences/com.apple.loginwindow LoginwindowText "Center for Internet Security Test Message". GUI: System Settings > Lock Screen > Set Show message when locked to enabled > Set > Insert text in the Set a message to appear on the lock screen that matches your organization's required text > Done.

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

tmaegis scan --target macos