SV-253073r1262387: TOSS must disable network management of the chrony daemon. | Tri-Lab Operating System Stack (TOSS) 4 STIG SCAP Benchmark

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Assessment Title

Rule Text

TOSS must disable network management of the chrony daemon.

Description

Discussion Text

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time when a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Not exposing the management interface of the chrony daemon on the network diminishes the attack space. TOSS utilizes the "timedatectl" command to view the status of the "systemd-timesyncd.service." The "timedatectl" status will display the local time, UTC, and the offset from UTC. Note that USNO offers authenticated NTP service to DoW and U.S. Government agencies operating on the NIPR and SIPR networks. Visit https://www.usno.navy.mil/USNO/time/ntp/DoW-customers for more information.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381

References

DPMS Target TOSS 4 DISA DPMS Target TOSS 4 5469

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.toss4os:def:253073
# TOSS must disable network management of the chrony daemon.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# /etc/chrony.conf: cmdport option is set to 0
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ \t]*cmdport[ \t]+0[ \t]*$' '/etc/chrony.conf' &>/dev/null
}

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.toss4os:def:253073
if [ ! -f "/etc/chrony.conf" ]; then echo "PASS"; exit 0; fi; if [ ! $(grep -q "^[ \t]*cmdport[ \t]+0[ \t]*$" /etc/chrony.conf; echo $?) -eq 0 ]; then echo "FAIL"; exit 1; fi; echo "PASS"; exit 0

Remediation

Configure the operating system disable network management of the chrony daemon by adding/modifying the following line in the /etc/chrony.conf file.

cmdport 0