Vulnerability Discussion

The macOS built-in iCloud document synchronization service must be
disabled to prevent organizational data from being synchronized to personal or nonapproved storage.

Apple's iCloud service does not provide an organization with enough control over the storage and access
of data and, therefore, automated document synchronization must be controlled by an organization
approved service.

Check

Verify the macOS system is configured to disable iCloud Document synchronization with the
following command:

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

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

Fix

Configure the macOS system to disable iCloud Document synchronization
by installing the "com.apple.applicationaccess" configuration profile.