UBTU-22-252010 - Ubuntu 22.04 LTS must, for networked systems, compare internal information system clocks at least every 24 hours with a server synchronized to one of the redundant United States Naval Observatory (USNO) time servers, or a time server designated for the appropriate DOD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).

Information

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.

Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.

Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).

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.

Solution

Configure Ubuntu 22.04 LTS to compare the system clock at least every 24 hours to the authoritative time source.

Add or modify the following line in the "/etc/chrony/chrony.conf" file:

server [source] iburst maxpoll = 16

Restart "chrony.service" for the changes to take effect by using the following command:

$ sudo systemctl restart chrony.service

Item Details

Audit Name: DISA Canonical Ubuntu 22.04 LTS STIG v2r8

Category: AUDIT AND ACCOUNTABILITY

Plugin: Unix

Control ID: 72150c9b635407148ac8dd5c3e11223e7286b5d465ca2773bf1d73d3bdffa4b6

Detections

Analytics

Information

Solution

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Item Details