Microsoft Windows 11

The Microsoft Defender SmartScreen for Explorer must be enabled

STIG ID: WN11-CC-000210 |   SRG: SRG-OS-000095-GPOS-00049 |   Severity: Medium |   CCI: CCI-000381 |   Vulnerability ID: V-253395

Description

Microsoft Defender SmartScreen helps protect systems from programs downloaded from the internet that may be malicious. Enabling Microsoft Defender SmartScreen will warn or prevent users from running potentially malicious programs.

Check

C-56848r829267_chk

This is applicable to unclassified systems, for other systems this is NA.If the following registry values do not exist or are not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SOFTWARE\Policies\Microsoft\Windows\System\Value Name: EnableSmartScreenValue Type: REG_DWORDValue: 0x00000001 (1)AndRegistry Hive: HKEY_LOCAL_MACHINERegistry Path: \SOFTWARE\Policies\Microsoft\Windows\System\Value Name: ShellSmartScreenLevelValue Type: REG_SZValue: Block

Fix

F-56798r829268_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Configure Windows Defender SmartScreen" to "Enabled" with "Warn and prevent bypass" selected. Windows 11 includes duplicate policies for this setting. It can also be configured under Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender SmartScreen >> Explorer.