SV-274182r1261388: Amazon Linux 2023 file system automount function must be disabled. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 file system automount function must be disabled.

Description

Discussion Text

Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Peripherals include, but are not limited to, such devices as flash drives, external storage, and printers.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001958

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:274182
# Amazon Linux 2023 file system automount function must be disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# autofs.service LoadState is masked if it exists.
# systemdunitproperty_object (systemdunitproperty_test)
test_1() {
  (systemctl show -p 'LoadState' --value 'autofs.service') | grep -qxF 'masked'
}
# autofs.service UnitFileState is masked if it exists.
# systemdunitproperty_object (systemdunitproperty_test)
test_2() {
  (systemctl show -p 'UnitFileState' --value 'autofs.service') | grep -qxF 'masked'
}
# autofs.service UnitFileState is disabled if it exists.
# systemdunitproperty_object (systemdunitproperty_test)
test_3() {
  (systemctl show -p 'UnitFileState' --value 'autofs.service') | grep -qxF 'disabled'
}

if ( ( test_1 && test_2 ) || test_3 ); 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:274182

if ! command -v systemctl &> /dev/null; then
  echo "FAIL"
  exit 1
fi

if systemctl is-enabled autofs.service | grep -q enabled; then
  echo "FAIL"
  exit 1
fi

if systemctl is-enabled autofs.service | grep -q masked; then
  echo "PASS"
  exit 0
fi

echo "FAIL"
exit 1

Remediation

Configure Amazon Linux 2023 to disable the ability to automount devices.

The autofs service can be disabled with the following command:

$ sudo systemctl mask --now autofs.service