SV-273996r1119976: Amazon Linux 2023 must check the GPG signature of locally installed software packages before installation. | Amazon Linux 2023 STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

Amazon Linux 2023 must check the GPG signature of locally installed software packages before installation.

Description

Discussion Text

Changes to any software components can have significant effects on the overall security of Amazon Linux 2023. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor. All software packages must be signed with a cryptographic key recognized and approved by the organization. Verifying the authenticity of software prior to installation validates the integrity of the software package received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor.

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

IA Controls

NIST SP 800-53

Not mappedCCI-003992

References

DPMS Target Amazon Linux 2023 DISA DPMS Target Amazon Linux 2023 5700

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.amzlx23os:def:273996
# Amazon Linux 2023 must check the GPG signature of locally installed software packages before installation.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/dnf/dnf.conf: localpkg_gpgcheck is set to True, 1, or yes.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^\s*localpkg_gpgcheck\s*=\s*(\w+)\b\s*$/\1/p' '/etc/dnf/dnf.conf') | grep -Pq '^(True|1|yes)$'
}

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.amzlx23os:def:273996

if grep -qE "^\\s*localpkg_gpgcheck\\s*=\\s*(True|1|yes)\\b\\s*$" /etc/dnf/dnf.conf; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Configure Amazon Linux 2023 to always check the GPG signature of local software packages before installation.

Add or update the following line in the [main] section of the /etc/dnf/dnf.conf file:

localpkg_gpgcheck=1