Vulnerability Discussion

If the system does not require Internet Sharing, support for it is
nonessential and must be disabled.

The information system must be configured to provide only essential capabilities. Disabling Internet
sharing helps prevent the unauthorized connection of devices, unauthorized transfer of information, and
unauthorized tunneling.

Check

Verify the macOS system is configured to disable Internet Sharing with the following
command:

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

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

Fix

Configure the macOS system to disable Internet Sharing by installing
the "com.apple.MCX" configuration profile.