STIGQter: STIG Summary: Microsoft Windows Server 2019 Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 04 May 2021:

Windows Server 2019 Windows Update must not obtain updates from other PCs on the Internet.

DISA Rule

SV-205870r569188_rule

Vulnerability Number

V-205870

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

WN19-CC-000260

Severity

CAT III

CCI(s)

CCI-000366 - The organization implements the security configuration settings.

Weight

Fix Recommendation

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Delivery Optimization >> "Download Mode" to "Enabled" with any option except "Internet" selected.

Acceptable selections include:

Bypass (100)
Group (2)
HTTP only (0)
LAN (1)
Simple (99)

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If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\Windows\DeliveryOptimization\

Value Name: DODownloadMode

Value Type: REG_DWORD
Value: 0x00000000 (0) - No peering (HTTP Only)
0x00000001 (1) - Peers on same NAT only (LAN)
0x00000002 (2) - Local Network / Private group peering (Group)
0x00000063 (99) - Simple download mode, no peering (Simple)
0x00000064 (100) - Bypass mode, Delivery Optimization not used (Bypass)

A value of 0x00000003 (3), Internet, is a finding.

Windows Server 2019 Windows Update must not obtain updates from other PCs on the Internet.

DISA Rule

Vulnerability Number

Group Title

Rule Version

Severity

CCI(s)

Weight

Fix Recommendation

Check Contents

Vulnerability Number

Documentable

Rule Version

Severity Override Guidance

Check Content Reference

Target Key

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