Ensure Firewall Stealth Mode Is Enabled

How it is checked

Audit method: Shell command

[ -x /usr/bin/osascript ] || exit 1
p=$(/usr/bin/osascript -l JavaScript <<'EOS'
$.NSUserDefaults.alloc.initWithSuiteName('com.apple.security.firewall').objectForKey('EnableStealthMode').js
EOS
)
s=$(/usr/libexec/ApplicationFirewall/socketfilterfw --getstealthmode 2>/dev/null)
if [ "$p" = true ] || printf '%s' "$s" | /usr/bin/grep -q 'stealth mode is on'; then echo compliant; else echo "EnableStealthMode=${p:-unset}; $s"; fi

Expected output

compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Profile (preferred): com.apple.security.firewall EnableStealthMode = <true/>. Terminal: sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setstealthmode on. GUI: System Settings > Network > Firewall > Options > Set Enabled stealth mode to enabled.

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

tmaegis scan --target macos