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The macOS Application Firewall must be enabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-225221 AOSX-15-005050 SV-225221r485636_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 OS X 10.15 (Catalina) Security Technical Implementation Guide 2020-08-13

Details

Check Text ( C-26920r467831_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.
Fix Text (F-26908r467832_fix)
This setting is enforced using the "Restrictions Policy" configuration profile.