The macOS system must unload tftpd.

From Apple OS X 10.13 Security Technical Implementation Guide

Associated with: CCI-000197

SV-96331r1_rule The macOS system must unload tftpd.

Vulnerability discussion

The "tftp" service must be disabled as it sends all data in a clear-text form that can be easily intercepted and read. The data needs to be protected at all times during transmission, and encryption is the standard method for protecting data in transit. If the data is not encrypted during transmission, it can be plainly read (i.e., clear text) and easily compromised. Disabling ftp is one way to mitigate this risk. Administrators should be instructed to use an alternate service for data transmission that uses encryption, such as SFTP.Additionally, the "tftp" service uses UDP, which is not secure.

Check content

To check if the "tfptd" service is disabled, run the following command: sudo launchctl print-disabled system | grep tftp If "com.apple.tftp" is not set to "true", this is a finding.

Fix text

To disable the "tfpd" service, run the following command: sudo launchctl unload -w /System/Library/LaunchDaemons/tftp.plist

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