XAML files must be disallowed (Restricted Sites zone).

From Microsoft Internet Explorer 11 Security Technical Implementation Guide

Part of DTBI460-IE11-Loading of XAML files - Restricted Sites

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-59533r1_rule XAML files must be disallowed (Restricted Sites zone).

Vulnerability discussion

These are eXtensible Application Markup Language (XAML) files. XAML is an XML-based declarative markup language commonly used for creating rich user interfaces and graphics that leverage the Windows Presentation Foundation. If you enable this policy setting and the drop-down box is set to Enable, XAML files will be automatically loaded inside Internet Explorer. Users will not be able to change this behavior. If the drop-down box is set to Prompt, users will receive a prompt for loading XAML files. If you disable this policy setting, XAML files will not be loaded inside Internet Explorer. Users will not be able to change this behavior. If you do not configure this policy setting, users will have the freedom to decide whether to load XAML files inside Internet Explorer.

Check content

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Internet Control Panel -> Security Page -> Restricted Sites Zone -> 'Allow loading of XAML files' 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 "2402" 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 -> 'Allow loading of XAML files' to 'Enabled', and select 'Disable' from the drop-down box.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.