SV-271831r1092205: OL 9 must be configured so that the root account is the only account having unrestricted access to the system. | Oracle Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

OL 9 must be configured so that the root account is the only account having unrestricted access to the system.

Description

Discussion Text

An account has root authority if it has a user identifier (UID) of "0". Multiple accounts with a UID of "0" afford more opportunity for potential intruders to guess a password for a privileged account. Proper configuration of sudo is recommended to afford multiple system administrators access to root privileges in an accountable manner.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Oracle Linux 9 DISA DPMS Target Oracle Linux 9 5680

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.ol9os:def:271831
# OL 9 must be configured so that the root account is the only account having unrestricted access to the system.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Only the root account has a UID of zero.
# password_object (password_test)
test_1() {
  [ "$(getent passwd 'root' | cut -d: -f3)" -ne 0 ]
}

if test_1; 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.ol9os:def:271831
if [ ! -e /etc/passwd ]; then echo "PASS"; exit 0; fi
for user in $(cat /etc/passwd | cut -d':' -f1); do
    if [ "$user" != "root" ] && [ $(cut -d':' -f3 /etc/passwd | grep -w "$user" | tr -d ':') -eq 0 ]; then
        echo "FAIL"; exit 1
    fi
done
echo "PASS"; exit 0

Remediation

Change the UID of any account on the system, other than root, that has a UID of "0". 

If the account is associated with system commands or applications, the UID should be changed to one greater than "0" but less than "1000". Otherwise, assign a UID of greater than "1000" that has not already been assigned.