STIGQter: STIG Summary: Canonical Ubuntu 24.04 LTS Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

Ubuntu 24.04 LTS must compare internal information system clocks at least every 24 hours with an authoritative time server.

DISA Rule

SV-270751r1066742_rule

Vulnerability Number

V-270751

Group Title

SRG-OS-000785-GPOS-00250

Rule Version

UBTU-24-600160

Severity

CAT III

CCI(s)

• CCI-004922 - Synchronize system clocks within and between systems or system components.
• CCI-004923 - Compare the internal system clocks on an organization-defined frequency with organization-defined authoritative time source.

Weight

10

Fix Recommendation

To configure the system clock to compare to the authoritative time source at least every 24 hours, edit the "/etc/chrony/chrony.conf" file. Add or correct the following lines, by replacing "[source]" in the following line with an authoritative time source:

server [source] iburst maxpoll 16

If the "chrony" service was running and the value of "maxpoll" or "server" was updated, the service must be restarted using the following command:

$ sudo systemctl restart chrony.service

Check Contents

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

Verify Ubuntu 24.04 LTS is configured to compare the system clock at least every 24 hours to an authoritative time source with the following command:

$ sudo grep -ir maxpoll /etc/chrony*
server [source] iburst maxpoll 16

If the parameter "server" is not set, is not set to an authoritative DOD time source, or is commented out, this is a finding.

If the "maxpoll" option is set to a number greater than 16, the line is commented out, or is missing, this is a finding.

Vulnerability Number

V-270751

Documentable

False

Rule Version

UBTU-24-600160

Severity Override Guidance

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

Verify Ubuntu 24.04 LTS is configured to compare the system clock at least every 24 hours to an authoritative time source with the following command:

$ sudo grep -ir maxpoll /etc/chrony*
server [source] iburst maxpoll 16

If the parameter "server" is not set, is not set to an authoritative DOD time source, or is commented out, this is a finding.

If the "maxpoll" option is set to a number greater than 16, the line is commented out, or is missing, this is a finding.

Check Content Reference

M

Target Key

5673