NixOS must not have the telnet package installed.

Severity
Group ID
Group Title
Version
Rule ID
Date
STIG Version
highV-268131SRG-OS-000074-GPOS-00042ANIX-00-000780SV-268131r1039281_rule2024-10-251
Description
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.
ℹ️ Check
Ensure the telnet package is not installed and available with the following command: $ whereis telnet telnet: If there is a path, and the output looks like "telnet: /nix/store/sqiphymcpky1yysgdc1aj4lr9jg9n53a-inetutils-2.2/bin/telnet", this is a finding.
✔️ Fix
Edit the NixOS Configuration file with "nano /etc/nixos/configuration.nix" and remove any references to pkgs.libtelnet, pkgs.busybox, or pkgs.inetutils from the environment.systemPackages list. Rebuild the NixOS configuration with the following command: $ sudo nixos-rebuild switch