SV-271440r1092462: OL 9 must be configured so that the graphical display manager is not the default target unless approved. | Oracle Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

OL 9 must be configured so that the graphical display manager is not the default target unless approved.

Description

Discussion Text

Unnecessary service packages must not be installed to decrease the attack surface of the system. Graphical display managers have a long history of security vulnerabilities and must not be used unless approved and documented.

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:271440
# OL 9 must be configured so that the graphical display manager is not the default target unless approved.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# default.target is symlinked to multi-user.target
# symlink_object (symlink_test)
test_1() {
  (readlink -f '/etc/systemd/system/default.target') | grep -Pq '[\S]*\/multi\-user\.target$'
}

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:271440
if [ ! -h /etc/systemd/system/default.target ]; then echo "PASS"; exit 0; fi
if [ "$(readlink -f /etc/systemd/system/default.target)" != "$(awk -F'/' '{print $1}' /etc/systemd/system/default.target)/multi-user.target" ]; then echo "FAIL"; exit 1; fi
echo "PASS"
exit 0

Remediation

Configure OL 9 to boot to the command line.

Set the default target to multi-user with the following command:
$ sudo systemctl set-default multi-user.target

If there is an operational requirement for a graphical user interface, document it with the ISSO.