Title

If the time service is configured, it must use an authorized time server. (Cat III impact)

Discussion

The Windows Time Service controls time synchronization settings. Time synchronization is essential for authentication and auditing purposes. If the Windows Time Service is used, it must synchronize with a secure, authorized time source. Domain-joined systems are automatically configured to synchronize with domain controllers. If an NTP server is configured, it must synchronize with a secure, authorized time source.

Check Content

Review the following registry values: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \Software\Policies\Microsoft\W32time\Parameters\ Value Name: Type Type: REG_SZ Value: Possible values are NoSync, NTP, NT5DS, AllSync and Value Name: NTPServer Type: REG_SZ Value: "address of the time server" If the following, this is a finding: "Type" has a value of "NTP" or "Allsync" AND the "NTPServer" value is set to "time.windows.com" or other unauthorized server. If the following, this not a finding: The referenced registry values do not exist. "Type" has a value of "NoSync" or "NT5DS". "Type" has a value of "NTP" or "Allsync" AND the "NTPServer" is blank or configured to an authorized time server. For DoD organizations, the US Naval Observatory operates stratum 1 time servers, identified at http://tycho.usno.navy.mil/ntp.html. Time synchronization will occur through a hierarchy of time servers down to the local level. Clients and lower-level servers will synchronize with an authorized time server in the hierarchy. Domain-joined systems are automatically configured to synchronize with domain controllers, and it would not be a finding unless this is changed.

Fix Text

If the system needs to be configured to an NTP server, configure the system to point to an authorized time server by setting the policy value for Computer Configuration -> Administrative Templates -> System -> Windows Time Service -> Time Providers -> "Configure Windows NTP Client" to "Enabled", and configure the "NtpServer" field to point to an authorized time server.

Additional Identifiers

Rule ID:

Vulnerability ID: V-3472

Group Title:

Expert Comments

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