STIGQter: STIG Summary: Windows 10 Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 04 May 2021:

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

DISA Rule

SV-220835r569187_rule

Vulnerability Number

V-220835

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

WN10-CC-000206

Severity

CAT III

CCI(s)

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

Weight

10

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)

v1507 (LTSB) does not include this group policy setting locally. For domain joined systems, configure through domain group policy as "HTTP only (0)" or "Lan (1)". Standalone systems configure using Settings >> Update & Security >> Windows Update >> Advanced Options >> "Choose how updates are delivered" with either "Off" or "PCs on my local network" selected.

Check Contents

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.

v1507 LTSB:
Domain joined systems:
Verify the registry value above.
If the value is not 0x00000000 (0) or 0x00000001 (1), this is a finding.

Standalone systems (configured in Settings):
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\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\

Value Name: DODownloadMode

Value Type: REG_DWORD
Value: 0x00000000 (0) - Off
0x00000001 (1) - LAN

Vulnerability Number

V-220835

Documentable

False

Rule Version

WN10-CC-000206

Severity Override Guidance

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.

v1507 LTSB:
Domain joined systems:
Verify the registry value above.
If the value is not 0x00000000 (0) or 0x00000001 (1), this is a finding.

Standalone systems (configured in Settings):
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\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\

Value Name: DODownloadMode

Value Type: REG_DWORD
Value: 0x00000000 (0) - Off
0x00000001 (1) - LAN

Check Content Reference

M

Target Key

4072

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