Red Hat Enterprise Linux 9 • Release: 7 Benchmark Date: 05 Jan 2026

CAT III V-257946 RHEL-09-252025

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

Documentable No
Rule ID SV-257946r958480_rule
CCI References
CCI-000381CCI-000382

Discussion

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

Check Procedure

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 Action

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