XAML files must be disallowed (Restricted Sites zone).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-46669	DTBI460-IE11	SV-59533r1_rule	ECSC-1	Medium

Description
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.

Description

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.

STIG	Date
Microsoft Internet Explorer 11 Security Technical Implementation Guide	2019-09-23

Details

Check Text ( C-49825r2_chk )
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.

Check Text ( C-49825r2_chk )

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 (F-50435r1_fix)
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.