Vulnerability Discussion

Media sharing must be disabled.

When Media Sharing is enabled, the computer starts a network listening service that shares the contents of the user's music collection with other users in the same subnet.

The information system must be configured to provide only essential capabilities. Disabling Media Sharing helps prevent the unauthorized connection of devices and the unauthorized transfer of information. Disabling Media Sharing mitigates this risk.

Note: The Media Sharing preference panel will still allow "Home Sharing" and "Share media with guests" to be checked but the service will not be enabled.

Check

Verify the macOS system is configured to disable media sharing with the following command:

/usr/bin/osascript -l JavaScript << EOS
function run() {
let pref1 = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.preferences.sharing.SharingPrefsExtension')\
.objectForKey('homeSharingUIStatus'))
let pref2 = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.preferences.sharing.SharingPrefsExtension')\
.objectForKey('legacySharingUIStatus'))
let pref3 = ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.preferences.sharing.SharingPrefsExtension')\
.objectForKey('mediaSharingUIStatus'))
if ( pref1 == 0 && pref2 == 0 && pref3 == 0 ) {
return("true")
} else {
return("false")
}
}
EOS

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

Fix

Configure the macOS system to disable media sharing by installing the "com.apple.preferences.sharing.SharingPrefsExtension" configuration profile.