SV-238326r987796: The Ubuntu operating system must not have the telnet package installed. | Canonical Ubuntu 20.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

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

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000197

References

DPMS Target Canonical Ubuntu 20.04 LTS DISA DPMS Target Canonical Ubuntu 20.04 LTS 5318

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.ubuntu2004:def:205
# The Ubuntu operating system must not have the telnet package installed.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# dpkginfo_object (dpkginfo_test)
test_1() {
  ! ( grep -A1 '^Package: telnetd$' /var/lib/dpkg/status &>/dev/null )
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL definition: oval:mil.disa.stig.ubuntu2004:def:205
if [ ! -f "/var/lib/dpkg/status" ]; then echo "PASS"; exit 0; fi; while read -r line; do if [[ $line =~ ^Package:\s+telnetd ]]; then echo "FAIL"; exit 1; fi; done < /var/lib/dpkg/status; echo "PASS"; exit 0;

Remediation

Remove the telnet package from the Ubuntu operating system by running the following command: 
 
$ sudo apt-get remove telnetd