Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the internet must be enabled.

From Microsoft Internet Explorer 11 Security Technical Implementation Guide

Part of DTBI1065-IE11-Managing SmartScreen Filter Warnings

Associated with: CCI-001169

SV-79203r1_rule Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the internet must be enabled.

Vulnerability discussion

This policy setting determines whether the user can bypass warnings from SmartScreen Filter. SmartScreen Filter warns the user about executable files that Internet Explorer users do not commonly download from the internet. If you enable this policy setting, SmartScreen Filter warnings block the user. If you disable or do not configure this policy setting, the user can bypass SmartScreen Filter warnings.

Check content

The policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Internet Explorer >> ”Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the internet” must be ”Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Internet Explorer\PhishingFilter. Criteria: If the value "PreventOverrideAppRepUnknown" is REG_DWORD = 1, this is not a finding.

Fix text

Set the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Internet Explorer >> ”Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the internet” to ”Enabled”.

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