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System time should be synchronized between all systems in an environment. This is typically done by establishing an authoritative time server or set of servers and having all systems synchronize their clocks to them. The chrony package can be installed with the following command:

$ apt-get install chrony


Time synchronization is important to support time sensitive security mechanisms like Kerberos and also ensures log files have consistent time records across the enterprise, which aids in forensic investigations.


Shell script

The following script can be run on the host to remediate the issue.


# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then

DEBIAN_FRONTEND=noninteractive apt-get install -y "chrony"

    >&2 echo 'Remediation is not applicable, nothing was done'

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Ensure chrony is installed
    name: chrony
    state: present
  when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
  - DISA-STIG-UBTU-20-010435
  - PCI-DSS-Req-10.4
  - PCI-DSSv4-10.6.1
  - enable_strategy
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - package_chrony_installed