Title

TOSS must disable network management of the chrony daemon. (Cat II impact)

Discussion

Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time when 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. Not exposing the management interface of the chrony daemon on the network diminishes the attack space. TOSS 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.

Check Content

Verify TOSS disables network management of the chrony daemon with the following command: $ sudo grep -w 'cmdport' /etc/chrony.conf cmdport 0 If the "cmdport" option is not set to "0", is commented out or missing, this is a finding.

Fix Text

Configure the operating system disable network management of the chrony daemon by adding/modifying the following line in the /etc/chrony.conf file. cmdport 0

Additional Identifiers

Rule ID: SV-253073r958478_rule

Vulnerability ID: V-253073

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.