Title

The macOS system must disable Internet Sharing. (Cat II impact)

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 Content

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 Text

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

Additional Identifiers

Rule ID: SV-259483r941071_rule

Vulnerability ID: V-259483

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.