PCI-10.4:

Synchronize all critical system clocks and times.

PCI-10.4: Obtain and review the process for getting and distributing the correct time within the organization. Also obtain and review related system parameter settings for the sample of (insert number and/or description of sample) system components. Verify the following is included in the process and implemented:

• NTP or similar technology is used for time synchronization.
• Two or three central time servers within the organization receive external time signals (directly from a special radio, GPS satellites, or other external sources—based on International Atomic Time and UTC (formerly GMT)), peer with each other to keep accurate time, and share the time with other internal servers (i.e., internal servers should not be all be receiving time signals from external sources).
• NTP is running the most recent version.
• Specific external hosts are designated from which the time servers will accept NTP time updates (to prevent an attacker from changing the clock). Optionally, those updates can be encrypted with a symmetric key, and access control lists can be created that specify the IP addresses of client machines that will be provided with the NTP service (to prevent unauthorized use of internal time servers).

See ntp.org for more information.

Testing Procedures

Insert testing guidance here.

Testing Frequency

Describe testing frequency here.

Evidence Archive Location

Insert hyperlink or location of evidence archive.

Control Stewards Process Narrative

Provide control steward commentary indicating the formal methodology in place.

Control Steward – Jon Doe

Process Illustration

Replace this test by inserting a process diagram, flowchart or other visual representation to illustrate the process narrative as necessary. Include a brief description of the process illustration.

Control Status and Auditors Commentary

The control is effective.

File:Greenlock.jpg

Status is acceptable.

Control Exception Commentary

Status is acceptable.

Remediation Plan

Remediation is not required at this time.

--Mdpeters 15:57, 2 March 2007 (EST)