Office must be configured to not allow read with browsers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-228555	DTOO200	SV-228555r508020_rule		Medium

Description
The Windows Rights Management Add-on for Internet Explorer provides a way for users who do not use the 2013 Office release to view, but not alter, files with restricted permissions. By default, IRM-enabled files are saved in a format that cannot be viewed by using the Windows Rights Management Add-on. If this setting is enabled, an embedded rights-managed HTML version of the content is saved with each IRM-enabled file, which can be viewed in Internet Explorer using the add-on, representing the risk of documents being read by those without the rights and not intended to have access to the document.

Description

The Windows Rights Management Add-on for Internet Explorer provides a way for users who do not use the 2013 Office release to view, but not alter, files with restricted permissions. By default, IRM-enabled files are saved in a format that cannot be viewed by using the Windows Rights Management Add-on. If this setting is enabled, an embedded rights-managed HTML version of the content is saved with each IRM-enabled file, which can be viewed in Internet Explorer using the add-on, representing the risk of documents being read by those without the rights and not intended to have access to the document.

STIG	Date
Microsoft Office System 2013 Security Technical Implementation Guide	2020-09-25

Details

Check Text ( C-30788r498943_chk )
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Manage Restricted Permissions "Allow users with earlier versions of Office to read with browsers" is set to "Disabled". Use the Windows Registry Editor to navigate to the following HKCU\Software\Policies\Microsoft\Office\15.0\common\drm If the value 'IncludeHTML' is REG_DWORD = 0, this is not a finding.

Check Text ( C-30788r498943_chk )

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Manage Restricted Permissions "Allow users with earlier versions of Office to read with browsers" is set to "Disabled".

Use the Windows Registry Editor to navigate to the following HKCU\Software\Policies\Microsoft\Office\15.0\common\drm

If the value 'IncludeHTML' is REG_DWORD = 0, this is not a finding.

Fix Text (F-30773r498944_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Manage Restricted Permissions "Allow users with earlier versions of Office to read with browsers" to "Disabled".