TMA-MACOS-2.6.6

Ensure FileVault Is Enabled

HighLevel 1Automatedmacos

Description

FileVault secures a system's data by automatically encrypting its boot volume and requiring a password or recovery key to access it. FileVault should be used with a saved escrow key to ensure that the owner can decrypt their data if the password is lost. FileVault may also be enabled using command line using the fdesetup command. Audit: Requires FileVault On and the com.apple.MCX dontAllowFDEDisable profile key (the benchmark requires the profile).

How it is checked

Audit method: Shell command

shell

s=$(/usr/bin/fdesetup status 2>/dev/null) || exit 1
p=$(/usr/bin/osascript -l JavaScript <<'EOS'
$.NSUserDefaults.alloc.initWithSuiteName('com.apple.MCX').objectForKey('dontAllowFDEDisable').js
EOS
)
if printf '%s' "$s" | /usr/bin/grep -q "FileVault is On" && [ "$p" = true ]; then echo compliant; else echo "$s dontAllowFDEDisable=${p:-unset}"; fi

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

Profile (preferred): com.apple.MCX dontAllowFDEDisable = <true/>. GUI: System Settings > Security & Privacy > Turn On.

Properties

Operating systems: macos-26
Tags: macossystem-settings
Reference: CIS Apple macOS 26 Tahoe Benchmark v1.1.0 - 2.6.6 Ensure FileVault Is Enabled

Check this host

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

shell

tmaegis scan --target macos