The macOS Application Firewall must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-230847	APPL-11-005050	SV-230847r877363_rule		Medium

Description
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

STIG	Date
Apple macOS 11 (Big Sur) Security Technical Implementation Guide	2022-11-18

Details

Check Text ( C-33792r877362_chk )
Verify that the built-in firewall is enabled: # /usr/sbin/system_profiler SPConfigurationProfileDataType \| /usr/bin/grep 'EnableFirewall\\|EnableStealthMode' If the return is not "EnableFirewall = 1;" and "EnableStealthMode = 1;" this is a finding. If the built-in firewall is not enabled, ask the System Administrator if another application firewall is installed and enabled. If no application firewall is installed and enabled, this is a finding.

Check Text ( C-33792r877362_chk )

Verify that the built-in firewall is enabled:

# /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep 'EnableFirewall\|EnableStealthMode'

If the return is not "EnableFirewall = 1;" and "EnableStealthMode = 1;" this is a finding.

If the built-in firewall is not enabled, ask the System Administrator if another application firewall is installed and enabled.

If no application firewall is installed and enabled, this is a finding.

Fix Text (F-33765r607429_fix)
This setting is enforced using the "Restrictions Policy" configuration profile.