The macOS system must enable the application firewall.

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.

Verify the macOS system is configured to enable the application firewall with the following command:

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

plist="$(/usr/bin/defaults read /Library/Preferences/com.apple.alf globalstate 2>/dev/null)"

if [[ "$profile" == "true" ]] && [[ "$plist" =~ [1,2] ]]; then echo "true" else echo "false" fi

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

Configure the macOS system to enable the application firewall with the following command:

/usr/bin/defaults write /Library/Preferences/com.apple.alf globalstate -int 1