The Download unsigned ActiveX controls property must be disallowed (Restricted Sites zone).

From Microsoft Internet Explorer 11 Security Technical Implementation Guide

Part of DTBI113-IE11-Download unsigned ActiveX - Restricted Sites

Associated with IA controls: DCMC-1

Associated with: CCI-001169

SV-59439r1_rule The Download unsigned ActiveX controls property must be disallowed (Restricted Sites zone).

Vulnerability discussion

Unsigned code is potentially harmful, especially when coming from an untrusted zone. ActiveX controls can contain potentially malicious code and must only be allowed to be downloaded from trusted sites. They must also be digitally signed.

Check content

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> 'Download unsigned ActiveX controls' must be 'Enabled', and 'Disable' selected from the drop-down box. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4 Criteria: If the value "1004" is REG_DWORD = 3, this is not a finding.

Fix text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> 'Download unsigned ActiveX controls' to 'Enabled', and select 'Disable' from the drop-down box.

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