SV-204430r987879: The Red Hat Enterprise Linux operating system must be configured so that users must re-authenticate for privilege escalation. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must be configured so that users must re-authenticate for privilege escalation.

Description

Discussion Text

Without re-authentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate. Satisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158

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

IA Controls

NIST SP 800-53

Not mappedCCI-002038V-71949SV-86573

References

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

Checks

DISA STIG (Manual Reference)

Verify the operating system requires users to reauthenticate for privilege escalation.

Check the configuration of the "/etc/sudoers" and "/etc/sudoers.d/*" files with the following command:

# grep -i authenticate /etc/sudoers /etc/sudoers.d/*

If any uncommented line is found with a "!authenticate" tag, this is a finding.

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:173
# The Red Hat Enterprise Linux operating system must be configured so that users must re-authenticate 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
# This script implements the OVAL definition oval:mil.disa.stig.rhel7:def:173

if [ ! -f "/etc/sudoers" ]; then
  echo "PASS"
  exit 0
fi

if grep -q "^(?!#).*[\\s]+\\!\\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 "$file" ]; then
    if grep -q "^(?!#).*[\\s]+\\!\\s*authenticate.*$" "$file"; then
      echo "FAIL"
      exit 1
    fi
  fi
done

echo "PASS"
exit 0

Remediation

Configure the operating system to require users to reauthenticate for privilege escalation.

Check the configuration of the "/etc/sudoers" file with the following command:

# visudo
Remove any occurrences of "!authenticate" tags in the file.

Check the configuration of the "/etc/sudoers.d/*" files with the following command:

# grep -i authenticate /etc/sudoers /etc/sudoers.d/*
Remove any occurrences of "!authenticate" tags in the file(s).