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RHEL 8 must disable the chrony daemon from acting as a server.


Overview

Finding ID Version Rule ID IA Controls Severity
V-230485 RHEL-08-030741 SV-230485r627750_rule Low
Description
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Minimizing the exposure of the server functionality of the chrony daemon diminishes the attack surface. RHEL 8 utilizes the "timedatectl" command to view the status of the "systemd-timesyncd.service". The "timedatectl" status will display the local time, UTC, and the offset from UTC. Note that USNO offers authenticated NTP service to DoD and U.S. Government agencies operating on the NIPR and SIPR networks. Visit https://www.usno.navy.mil/USNO/time/ntp/dod-customers for more information.
STIG Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-09-07

Details

Check Text ( C-33154r568201_chk )
Verify RHEL 8 disables the chrony daemon from acting as a server with the following command:

$ sudo grep -w 'port' /etc/chrony.conf

port 0

If the "port" option is not set to "0", is commented out or missing, this is a finding.
Fix Text (F-33129r568202_fix)
Configure the operating system to disable the chrony daemon from acting as a server by adding/modifying the following line in the /etc/chrony.conf file.

port 0