Vulnerability Discussion

Time synchronization must be enforced on all networked systems.

This rule ensures the uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Satisfies: SRG-OS-000355-GPOS-00143,SRG-OS-000356-GPOS-00144

Check

Verify the macOS system is configured to enforce time synchronization with the following command:

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

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

Fix

Configure the macOS system to enforce time synchronization by installing the "com.apple.timed" configuration profile.