Ubuntu 22.04 LTS must synchronize internal information system clocks to the authoritative time source when the time difference is greater than one second.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-260520	UBTU-22-252015	SV-260520r986274_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. 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 setting time periods for different types of systems (e.g., financial, legal, or mission-critical systems). Organizations should also consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). This requirement is related to the comparison done every 24 hours in SRG-OS-000355 because a comparison must be done to determine the time difference.

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. 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 setting time periods for different types of systems (e.g., financial, legal, or mission-critical systems). Organizations should also consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints). This requirement is related to the comparison done every 24 hours in SRG-OS-000355 because a comparison must be done to determine the time difference.

STIG	Date
Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-64249r953371_chk )
Verify Ubuntu 22.04 LTS synchronizes internal system clocks to the authoritative time source when the time difference is greater than one second. Note: If the system is not networked, this requirement is not applicable. Check the value of "makestep" by using the following command: $ grep -ir makestep /etc/chrony* makestep 1 1 If "makestep" is not set to "1 1", is commented out, or is missing, this is a finding. Verify the NTP service is active and the system clock is synchronized with the authoritative time source: $ timedatectl \| grep -Ei '(synchronized\|service)' System clock synchronized: yes NTP service: active If the NTP service is not active, this is a finding. If the system clock is not synchronized, this is a finding.

Check Text ( C-64249r953371_chk )

Verify Ubuntu 22.04 LTS synchronizes internal system clocks to the authoritative time source when the time difference is greater than one second.

Note: If the system is not networked, this requirement is not applicable.

Check the value of "makestep" by using the following command:

$ grep -ir makestep /etc/chrony*
makestep 1 1

If "makestep" is not set to "1 1", is commented out, or is missing, this is a finding.

Verify the NTP service is active and the system clock is synchronized with the authoritative time source:

$ timedatectl | grep -Ei '(synchronized|service)'
System clock synchronized: yes
NTP service: active

If the NTP service is not active, this is a finding.

If the system clock is not synchronized, this is a finding.

Fix Text (F-64157r953372_fix)
Configure chrony to synchronize the internal system clocks to the authoritative source when the time difference is greater than one second by doing the following: Edit the "/etc/chrony/chrony.conf" file and add: makestep 1 1 Restart the chrony service: $ sudo systemctl restart chrony.service