SV-253394r1268251: Windows Update must not obtain updates from other PCs on the internet. | Microsoft Windows 11 STIG SCAP Benchmark

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Assessment Title

Rule Text

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

Description

Discussion Text

Windows 11 allows Windows Update to obtain updates from additional sources instead of Microsoft. In addition to Microsoft, updates can be obtained from and sent to PCs on the local network as well as on the internet. This is part of the Windows Update trusted process; however, to minimize outside exposure, obtaining updates from or sending to systems on the internet must be prevented.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Microsoft Windows 11 DISA DPMS Target Microsoft Windows 11 5471

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows11:def:253394
# Windows Update must not obtain updates from other PCs on the internet.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# 'DownloadMode' is set to 'Enabled' with 'HTTP only, LAN, Group, Simple, or Bypass' selected.
# registry_object (registry_test)
function test_1 {
  return ((((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 0)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 1)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 2)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 99)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\DeliveryOptimization' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 100)))
}
# Standalone Windows system
# wmi57_object (wmi57_test)
function test_2 {
  return ((((Get-CimInstance -Namespace 'root\cimv2' -Query 'SELECT DomainRole FROM win32_computersystem' | Select-Object -First 1) | Select-Object -ExpandProperty 'DomainRole') -eq '0') -or (((Get-CimInstance -Namespace 'root\cimv2' -Query 'SELECT DomainRole FROM win32_computersystem' | Select-Object -First 1) | Select-Object -ExpandProperty 'DomainRole') -eq '2'))
}
# 'DownloadMode' is set to 'Enabled' with 'HTTP only, or LAN' selected.
# registry_object (registry_test)
function test_3 {
  return ((((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 0)) -or (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config').GetValueKind('DODownloadMode').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config' -Name 'DODownloadMode' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DODownloadMode') -eq 1)))
}

if ((test_1 -or (test_2 -and test_3))) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_11 target this check assesses.

# oval:mil.disa.stig.windows11:def:253394
if (!(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\DeliveryOptimization" -Name "DODownloadMode" -ErrorAction SilentlyContinue) -or 
(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\DeliveryOptimization" -Name "DODownloadMode").DODownloadMode -eq 0 -or 
(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\DeliveryOptimization" -Name "DODownloadMode").DODownloadMode -eq 1 -or 
(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\DeliveryOptimization" -Name "DODownloadMode").DODownloadMode -eq 2 -or 
(Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\DeliveryOptimization" -Name "DODownloadMode").DODownloadMode -eq 99) {exit 1} else {exit 0}

Remediation

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)