SV-237633r991589: The Red Hat Enterprise Linux operating system must restrict privilege elevation to authorized personnel. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must restrict privilege elevation to authorized personnel.

Description

Discussion Text

The sudo command allows a user to execute programs with elevated (administrator) privileges. It prompts the user for their password and confirms your request to execute a command by checking a file, called sudoers. If the "sudoers" file is not configured correctly, any user defined on the system can initiate privileged actions on the target system.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

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

Checks

DISA STIG (Manual Reference)

Verify the "sudoers" file restricts sudo access to authorized personnel.
$ sudo grep -iw 'ALL' /etc/sudoers /etc/sudoers.d/*

If the either of the following entries are returned, this is a finding:
ALL     ALL=(ALL) ALL
ALL     ALL=(ALL:ALL) ALL

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:177
# The Red Hat Enterprise Linux operating system must restrict privilege elevation to authorized personnel.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# ALL is not configured in /etc/sudoers
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ! ( grep -Pq '^\s*ALL\s+ALL\=\(ALL(?:|\:ALL)\)\s+ALL\s*$' '/etc/sudoers' &>/dev/null )
}
# ALL is not configured in /etc/sudoers.d
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ! ( grep -rqP --include='*' '^\s*ALL\s+ALL\=\(ALL(?:|\:ALL)\)\s+ALL\s*$' '/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
# DISA STIG RHEL7 rule oval:mil.disa.stig.rhel7:def:177 compliance check
if [ ! -f "/etc/sudoers" ] || [ ! $(grep -E "^\\s*ALL\\s+ALL\\=\\(ALL(?:|:ALL)\\)\\s+ALL\\s*$" /etc/sudoers | wc -l) -eq 0 ] && [ ! -d "/etc/sudoers.d" ] || [ ! $(find /etc/sudoers.d -type f -exec grep -E "^\\s*ALL\\s+ALL\\=\\(ALL(?:|:ALL)\\)\\s+ALL\\s*$" {} + | wc -l) -eq 0 ]; then echo "FAIL"; exit 1; fi; echo "PASS"; exit 0

Remediation

Remove the following entries from the sudoers file:
ALL     ALL=(ALL) ALL
ALL     ALL=(ALL:ALL) ALL