Vulnerability Discussion

The built-in web server managed by launchd is a nonessential service built into macOS and must be disabled and not running.

Note: The built-in web server is disabled at startup by default with macOS.

Check

Verify the macOS system is configured to disable the built-in web server with the following command:

result="FAIL"
enabled=$(/bin/launchctl print-disabled system | /usr/bin/grep '"org.apache.httpd" => enabled')
running=$(/bin/launchctl print system/org.apache.httpd 2>/dev/null)

if [[ -z "$running" ]] && [[ -z "$enabled" ]]; then
result="PASS"
elif [[ -n "$running" ]]; then
result=result+" RUNNING"
elif [[ -n "$enabled" ]]; then
result=result+" ENABLED"
fi
echo $result

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

Fix

Configure the macOS system to disable the built-in web server with the following command:

/usr/sbin/apachectl stop 2>/dev/null
/bin/launchctl disable system/org.apache.httpd

The system may need a restart for the update to take effect.