SV-257946r1184307: RHEL 9 must disable the chrony daemon from acting as a server. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must disable the chrony daemon from acting as a server.

Description

Discussion Text

Minimizing the exposure of the server functionality of the chrony daemon diminishes the attack surface. Satisfies: SRG-OS-000096-GPOS-00050, SRG-OS-000095-GPOS-00049

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381Not mappedCCI-000382

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

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.rhel9os:def:257946
# RHEL 9 must disable the chrony daemon from acting as a server.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  [ "$(sed -En 's/^[ \t]*port[ \t]+(\d+)[ \t]*$/\1/p' '/etc/chrony.conf')" -eq 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.rhel9os:def:257946
if [ ! -f "/etc/chrony.conf" ]; then echo "PASS"; exit 0; fi
content=$(grep -E "^[ \t]*port[ \t]+(\\d+)[ \t]*$" /etc/chrony.conf)
if [ -n "$content" ] && echo "$content" | awk '{print $2}' | grep -q '^0$'; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Configure RHEL 9 to disable the chrony daemon from acting as a server by adding/modifying the following line in the /etc/chrony.conf file:

port 0