Vulnerability Discussion

Auto logout must be configured to automatically terminate a user session and log out the after 86400 seconds of inactivity.

Note: The maximum that macOS can be configured for autologoff is 86400 seconds.

[IMPORTANT]
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The automatic logout may cause disruptions to an organization's workflow and/or loss of data. Information system security officers (ISSOs) are advised to first fully weigh the potential risks posed to their organization before opting to disable the automatic logout setting.
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Check

Verify the macOS system is configured to enforce auto logout after 86400 seconds of inactivity with the following command:

/usr/bin/osascript -l JavaScript << EOS
$.NSUserDefaults.alloc.initWithSuiteName('.GlobalPreferences')\
.objectForKey('com.apple.autologout.AutoLogOutDelay').js
EOS

If the result is not "86400", this is a finding.

Fix

Configure the macOS system to enforce auto logout after 86400 seconds of inactivity by installing the "com.apple.GlobalPreferences" configuration profile.