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

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-223054	SRG-APP-000209	DTBI113-IE11	SV-223054r879629_rule	2023-12-01	2

Description
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.

ℹ️ Check
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.

ℹ️ Check

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
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.