RHEL 9 must disable the chrony daemon from acting as a server.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-257946 | RHEL-09-252025 | SV-257946r1184307_rule | CCI-000381 | low |
| Description | ||||
| 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 | ||||
| STIG | Date | |||
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2026-02-05 | |||
Details
Check Text (C-257946r1184307_chk)
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.
Fix Text (F-61611r925824_fix)
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