Finding ID | Version | Rule ID | IA Controls | Severity |
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V-219331 | UBTU-18-010501 | SV-219331r610963_rule | Medium |
Description |
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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). |
STIG | Date |
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Canonical Ubuntu 18.04 LTS Security Technical Implementation Guide | 2021-03-10 |
Check Text ( C-21056r305321_chk ) |
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If the system is not networked this requirement is Not Applicable. The system clock must be configured to compare the system clock at least every 24 hours to the authoritative time source. Check the value of "maxpoll" in the "/etc/chrony/chrony.conf" file with the following command: # sudo grep maxpoll /etc/chrony/chrony.conf server tick.usno.navy.mil iburst maxpoll 17 If "maxpoll" is not set to "17" or does not exist, this is a finding. Verify that the "chrony.conf" file is configured to an authoritative DoD time source by running the following command: # grep -i server /etc/chrony/chrony.conf server tick.usno.navy.mil iburst maxpoll 17 server tock.usno.navy.mil iburst maxpoll 17 server ntp2.usno.navy.mil iburst maxpoll 17 If the parameter "server" is not set, is not set to an authoritative DoD time source, or is commented out, this is a finding. |
Fix Text (F-21055r621659_fix) |
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If the system is not networked this requirement is Not Applicable. To configure the system clock to compare the system clock at least every 24 hours to the authoritative time source, edit the "/etc/chrony/chrony.conf" file. Add or correct the following lines, by replacing "[source]" in the following line with an authoritative DoD time source. server [source] iburst maxpoll = 17 If the "chrony" service was running and the value of "maxpoll" or "server" was updated then the service must be restarted using the following command: # sudo systemctl restart chrony.service |