CCI-001891

The information system compares internal information system clocks on an organization-defined frequency with an organization-defined authoritative time source.

Implementation Guidance

The organization being inspected/assessed configures the information system to synchronize internal information system clocks every 24 hours for networked systems with an authoritative time server which is synchronized with redundant United States Naval Observatory (USNO) time servers as designated for the appropriate DoD network (NIPRNet / SIPRNet) and/or the Global Positioning System (GPS) when the time difference is greater than the difference defined in AU-8 (1), CCI 1892. For information system components that have applicable STIGs or SRGs, the organization being inspected/assessed must comply with the STIG/SRG guidance that pertains to CCI 1891. DoD has defined the frequency as every 24 hours for networked systems. DoD has defined the authoritative time source as an authoritative time server which is synchronized with redundant United States Naval Observatory (USNO) time servers as designated for the appropriate DoD network (NIPRNet / SIPRNet) and/or the Global Positioning System (GPS).

Validation Procedures

The organization conducting the inspection/assessment examines the information system to ensure that the organization being inspected/assessed has configured the information system to synchronize internal information system clocks every 24 hours for networked systems with an authoritative time server which is synchronized with redundant United States Naval Observatory (USNO) time servers as designated for the appropriate DoD network (NIPRNet / SIPRNet) and/or the Global Positioning System (GPS) when the time difference is greater than the difference defined in AU-8 (1), CCI 1892. For information system components that have applicable STIGs or SRGs, the organization conducting the inspection/assessment evaluates the components to ensure that the organization being inspected/assessed has configured the information system in compliance with the applicable STIGs and SRGs pertaining to CCI 1891. DoD has defined the frequency as every 24 hours for networked systems. DoD has defined the authoritative time source as an authoritative time server which is synchronized with redundant United States Naval Observatory (USNO) time servers as designated for the appropriate DoD network (NIPRNet / SIPRNet) and/or the Global Positioning System (GPS).

Compelling Evidence

1.) Signed and dated audit and accountability policy

The controls below (if any) were marked by NIST as being related to CCI-001891.