SV-274179r1120525: Amazon Linux 2023 must mount /dev/shm with the nodev option. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must mount /dev/shm with the nodev option.

Description

Discussion Text

The "nodev" mount option causes the system to not interpret character or block special devices. Executing character or block special devices from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001764

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:274179
# Amazon Linux 2023 must mount /dev/shm with the nodev option.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# partition_object (partition_test)
test_1() {
  (findmnt -n -o OPTIONS '/dev/shm' | tr ',' '\n') | grep -qxF 'nodev'
}
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  (sed -En 's/^\s*[^#\s]+\s+\/dev\/shm\s+\S+\s+(\S+)\s+\S+\s+\S+\s*$/\1/p' '/etc/fstab') | grep -Pq '(?:^nodev$|^nodev,|,nodev$|,nodev,)'
}

if ( test_1 && test_2 ); then
  echo "PASS"
else
  echo "FAIL"
fi

Remediation

Configure Amazon Linux 2023 so that "/dev/shm" is mounted with the "nodev" option.

Modify "/etc/fstab" to use the "nodev" option on the "/dev/shm" file system.