macOS 26 - Tahoe

The macOS system must enable macOS Application Firewall

STIG ID: APPL-26-005050 | SRG: SRG-OS-000480-GPOS-00232 | Severity: Medium | CCI: CCI-000366 | Vulnerability ID: V-277167

Description

The macOS Application Firewall is the built-in firewall that comes with macOS, and it must be enabled.

When the macOS Application Firewall is enabled, the flow of information within the information system and between interconnected systems will be controlled by approved authorizations.

Check

C-81322r1148951_chk

Verify the macOS system is configured to enable the Application Firewall with the following command:

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

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

Fix

F-81227r1148952_fix

Configure the macOS system to enable the Application Firewall by installing the "com.apple.security.firewall" configuration profile.