Users must not be allowed to ignore Windows Defender SmartScreen filter warnings for malicious websites in Microsoft Edge.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-63699	WN10-CC-000230	SV-78189r4_rule		Medium

Description
The Windows Defender SmartScreen filter in Microsoft Edge provides warning messages and blocks potentially malicious websites and file downloads. If users are allowed to ignore warnings from the Windows Defender SmartScreen filter they could still access malicious websites.

STIG	Date
Windows 10 Security Technical Implementation Guide	2017-12-01

Details

Check Text ( C-64447r2_chk )
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\MicrosoftEdge\PhishingFilter\ Value Name: PreventOverride Type: REG_DWORD Value: 0x00000001 (1)

Fix Text (F-81279r1_fix)

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Microsoft Edge >> "Prevent bypassing Windows Defender SmartScreen prompts for sites" to "Enabled". v1703 of Windows 10 includes duplicate policies for this setting. It can also be configured under Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender SmartScreen >> Microsoft Edge. v1607 of Windows 10, the policy name is "Prevent bypassing SmartScreen prompts for sites". Prior to v1607 of Windows 10, the policy name is "Don't allow SmartScreen Filter warning overrides".