Red Hat Enterprise Linux 9 Security Technical Implementation Guide

The Red Hat Enterprise Linux 9 Security Technical Implementation Guide (V2 R9) has 445 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R9

ArchivedPublished Wed Jul 01 2026

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

Red Hat Enterprise Linux 9 Security Technical Implementation Guide

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

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-257946

Rule

SV-257946r1184307_rule

Severity

low

Rule Version

RHEL-09-252025

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

Note: If the server is serving as an NTP server, this is not applicable.

Verify RHEL 9 disables the chrony daemon from acting as a server with the following command:

$ grep -w port /etc/chrony.conf

port 0

If the "port" option is not set to "0", is commented out, or is missing, this is a finding.

Implementation Procedure

Fix Text

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

STIG check 166 of 445 in the Red Hat Enterprise Linux 9 STIG checklist

← Previous · V-257945RHEL 9 must securely compare internal information system clocks at least every 24 hours.Next · V-257947 →RHEL 9 must disable network management of the chrony daemon.