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RHEL-09-252025 RHEL 9 must disable the chrony daemon from acting as a server.

DISA STIG library V2R10
All changes in this version
first version loaded CAT III

Maps to CM-7 via CCI-000381, CCI-000382

Title

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

Control

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.

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

Related controls

CCI-000381, CCI-000382

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