Ubuntu 22.04 LTS must not have the "telnet" package installed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260483	UBTU-22-215035	SV-260483r987796_rule		High

Description

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities are often overlooked and therefore, may remain unsecure. They increase the risk to the platform by providing additional attack vectors. Telnet is a client/server application protocol that provides an unencrypted remote access service, which does not provide for the confidentiality and integrity of user passwords or the remote session. If users were allowed to login to a system using Telnet, the privileged user passwords and communications could be compromised. Removing the "telnetd" package decreases the risk of accidental or intentional activation of the Telnet service.

STIG	Date
Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide	2025-05-16

Details

Check Text (C-64212r953260_chk)

Verify that the "telnetd" package is not installed on Ubuntu 22.04 LTS by using the following command:

$ dpkg -l | grep telnetd

If the "telnetd" package is installed, this is a finding.

Fix Text (F-64120r953261_fix)

Remove the "telnetd" package by using the following command:

$ sudo apt-get remove telnetd