Vulnerability Discussion

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.

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.

Check

Verify OL 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" or is commented out or missing, this is a finding.

Fix

Configure OL 8 to disable the chrony daemon from acting as a server by adding/modifying the following line in the "/etc/chrony.conf" file.

port 0