SV-235721r960852: Bypassing of Microsoft Defender SmartScreen warnings about downloads must be disabled. | Microsoft Edge STIG SCAP Benchmark

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Assessment Title

Rule Text

Bypassing of Microsoft Defender SmartScreen warnings about downloads must be disabled.

Description

Discussion Text

This policy setting allows a decision to be made on whether users can override Microsoft Defender SmartScreen warnings about unverified downloads. If this setting is enabled, users cannot ignore Microsoft Defender SmartScreen warnings, and are prevented from completing the unverified downloads. If this policy is disabled or not configured, users can ignore Microsoft Defender SmartScreen warnings and complete unverified downloads.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000870

References

DPMS Target Microsoft Edge DISA DPMS Target Microsoft Edge 5280

Checks

DISA STIG (Manual Reference)

The policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing of Microsoft Defender SmartScreen warnings about downloads" must be set to "Enabled".

Use the Windows Registry Editor to navigate to the following key:
HKLM\SOFTWARE\Policies\Microsoft\Edge

If the value for "PreventSmartScreenPromptOverrideForFiles" is not set to "REG_DWORD = 1", this is a finding.

If this machine is on SIPRNet, this is Not Applicable.

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.edge:def:101
# Bypassing of Microsoft Defender SmartScreen warnings about downloads must be disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Check that the setting 'Prevent bypassing Microsoft Defender SmartScreen warnings about downloads' is enabled.
# 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\Edge').GetValueKind('PreventSmartScreenPromptOverrideForFiles').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge' -Name 'PreventSmartScreenPromptOverrideForFiles' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'PreventSmartScreenPromptOverrideForFiles') -eq 1))
}

if (test_1) {
  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_edge target this check assesses.

# OVAL Definition: oval:mil.disa.stig.edge:def:101
$registryPath = "HKLM:\SOFTWARE\Policies\Microsoft\Edge"
$registryKey = "PreventSmartScreenPromptOverrideForFiles"
if (Test-Path $registryPath) {
    $registryValue = Get-ItemProperty -Path $registryPath -Name $registryKey -ErrorAction SilentlyContinue
    if ($registryValue -and $registryValue.$registryKey -eq 1) {
        Write-Output "PASS"
        exit 0
    }
}
Write-Output "FAIL"
exit 1

Remediation

Set the policy value for "Computer Configuration/Administrative Templates/Microsoft Edge/SmartScreen settings/Prevent bypassing of Microsoft Defender SmartScreen warnings about downloads" must to "Enabled".