STIGQter: STIG Summary: Microsoft Windows Server 2016 Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 04 May 2021:

The time service must synchronize with an appropriate DoD time source.

DISA Rule

SV-224862r569186_rule

Vulnerability Number

V-224862

Group Title

SRG-OS-000355-GPOS-00143

Rule Version

WN16-00-000450

Severity

CAT III

CCI(s)

• CCI-001891 - The information system compares internal information system clocks on an organization-defined frequency with an organization-defined authoritative time source.

Weight

10

Fix Recommendation

Configure the system to synchronize time with an appropriate DoD time source.

Domain-joined systems use NT5DS to synchronize time from other systems in the domain by default.

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 appropriate DoD time server.

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.

Check Contents

Review the Windows time service configuration.

Open an elevated "Command Prompt" (run as administrator).

Enter "W32tm /query /configuration".

Domain-joined systems (excluding the domain controller with the PDC emulator role):

If the value for "Type" under "NTP Client" is not "NT5DS", this is a finding.

Other systems:

If systems are configured with a "Type" of "NTP", including standalone systems and the domain controller with the PDC Emulator role, and do not have a DoD time server defined for "NTPServer", this is a finding.

To determine the domain controller with the PDC Emulator role:

Open "PowerShell".

Enter "Get-ADDomain | FT PDCEmulator".

Vulnerability Number

V-224862

Documentable

False

Rule Version

WN16-00-000450

Severity Override Guidance

Review the Windows time service configuration.

Open an elevated "Command Prompt" (run as administrator).

Enter "W32tm /query /configuration".

Domain-joined systems (excluding the domain controller with the PDC emulator role):

If the value for "Type" under "NTP Client" is not "NT5DS", this is a finding.

Other systems:

If systems are configured with a "Type" of "NTP", including standalone systems and the domain controller with the PDC Emulator role, and do not have a DoD time server defined for "NTPServer", this is a finding.

To determine the domain controller with the PDC Emulator role:

Open "PowerShell".

Enter "Get-ADDomain | FT PDCEmulator".

Check Content Reference

M

Target Key

4205

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