SV-204452r958936: The Red Hat Enterprise Linux operating system must remove all software components after updated versions have been installed. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must remove all software components after updated versions have been installed.

Description

Discussion Text

Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002617V-71987SV-86611

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify the operating system removes all software components after updated versions have been installed.

Check if yum is configured to remove unneeded packages with the following command:

# grep -i clean_requirements_on_remove /etc/yum.conf
clean_requirements_on_remove=1

If "clean_requirements_on_remove" is not set to "1", "True", or "yes", or is not set in "/etc/yum.conf", this is a finding.

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.rhel7:def:108
# The Red Hat Enterprise Linux operating system must remove all software components after updated versions have been installed.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# check value of clean_requirements_on_remove in /etc/yum.conf
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^\s*clean_requirements_on_remove\s*=\s*(\S+)\s*$/\1/p' '/etc/yum.conf') | grep -Pq '^(1|True|yes)$'
}

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.rhel7:def:108
if grep -qE '^\s*clean_requirements_on_remove\s*=[\s]*(1|True|yes)\s*$' /etc/yum.conf; then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure the operating system to remove all software components after updated versions have been installed.

Set the "clean_requirements_on_remove" option to "1" in the "/etc/yum.conf" file:

clean_requirements_on_remove=1