SV-274015r1120033: Amazon Linux 2023 must require users to reauthenticate for privilege escalation. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must require users to reauthenticate for privilege escalation.

Description

Discussion Text

Without reauthentication, users may access resources or perform tasks for which they do not have authorization.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002038

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:274015
# Amazon Linux 2023 must require users to reauthenticate for privilege escalation.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# '!authenticate' does not exist in /etc/sudoers
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ! ( grep -Pq '^(?!#).*\s+!\s*authenticate.*$' '/etc/sudoers' &>/dev/null )
}
# '!authenticate' does not exist in /etc/sudoers.d
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ! ( grep -rqP --include='*' '^(?!#).*\s+!\s*authenticate.*$' '/etc/sudoers.d' &>/dev/null )
}

if ( test_1 && test_2 ); 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:274015

if [ ! -f "/etc/sudoers" ]; then echo "PASS"; exit 0; fi
if grep -q "^\s*!authenticate" /etc/sudoers; then echo "FAIL"; exit 1; fi

if [ ! -d "/etc/sudoers.d" ]; then echo "PASS"; exit 0; fi
for file in /etc/sudoers.d/*; do
    if [ -f "$file" ] && grep -q "^\s*!authenticate" "$file"; then echo "FAIL"; exit 1; fi
done

echo "PASS"
exit 0

Remediation

Configure Amazon Linux 2023 to not allow users to execute privileged actions without authenticating.

Remove any occurrence of "!authenticate" found in "/etc/sudoers" file or files in the "/etc/sudoers.d" directory.

$ sudo sed -i '/\!authenticate/ s/^/# /g' /etc/sudoers /etc/sudoers.d/*