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

STIG ID: RHEL-09-252025  |  SRG: SRG-OS-000096-GPOS-00050 |  Severity: low |  CCI: CCI-000381,CCI-000382 |  Vulnerability Id: V-257946

Vulnerability 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

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

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
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