The operating system must transmit only cryptographically-protected passwords.

From Apple OS X 10.10 (Yosemite) Workstation Security Technical Implementation Guide

Part of SRG-OS-000074

Associated with: CCI-000197

SV-74101r1_rule The operating system must transmit only cryptographically-protected passwords.

Vulnerability discussion

The telnet service must be disabled, as it sends all data, including the user's password in a clear text form that can be easily intercepted and read. Passwords need to be protected at all times and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Disabling telnet is one way to mitigate this risk.

Check content

To check if the 'telnet' service is disabled, use the following command: sudo launchctl print-disabled system | grep com.apple.telnetd If the results do not show the following: "com.apple.telnetd" => true this is a finding.

Fix text

To disable the 'telnet' service, run the following command: sudo launchctl disable system/com.apple.telnetd The system may need to be restarted for the update to take effect.

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