The Ubuntu operating system must not have the telnet package installed.

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.

Verify that the telnet package is not installed on the Ubuntu operating system by running the following command:

$ dpkg -l | grep telnetd 

If the package is installed, this is a finding.

Remove the telnet package from the Ubuntu operating system by running the following command:

$ sudo apt-get remove telnetd