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os_tftpd_disable Disable Trivial File Transfer Protocol Service

NIST macOS Security Compliance Project Tahoe Guidance, Revision 3.0 (cf656e8)
All changes in this version
first version loaded macOS

Title

Disable Trivial File Transfer Protocol Service

Control

result="FAIL"
enabled=$(/bin/launchctl print-disabled system | /usr/bin/grep '"com.apple.tftpd" => enabled')
running=$(/bin/launchctl print system/com.apple.tftpd 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

Discussion

If the system does not require Trivial File Transfer Protocol (TFTP), support it is non-essential and _MUST_ be disabled.

The information system _MUST_ be configured to provide only essential capabilities. Disabling TFTP helps prevent the unauthorized connection of devices and the unauthorized transfer of information.

NOTE: TFTP service is disabled at startup by default macOS.

Related controls

ac-17, ac-3, ia-5.1

Fix

[source,bash]
----
/bin/launchctl bootout system/com.apple.tftpd
/bin/launchctl disable system/com.apple.tftpd
----
The system may need to be restarted for the update to take effect.