Key Usage Filtering must be allowed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26629	DTOO311 - Office System	SV-34085r1_rule		Medium

Description
This policy setting allows you to filter a list of digital certificates for signing Excel, PowerPoint, and Word documents, based on the Key Usage field. The Key Usage field in a certificate is used to represent a series of basic constraints about the broad types of operations that can be performed with the certificate. Key usage filtering allows you to filter the list of installed certificates that can be used for signing documents. The filtered list will appear when users attempt to select a certificate for digitally signing a document.

Description

This policy setting allows you to filter a list of digital certificates for signing Excel, PowerPoint, and Word documents, based on the Key Usage field. The Key Usage field in a certificate is used to represent a series of basic constraints about the broad types of operations that can be performed with the certificate. Key usage filtering allows you to filter the list of installed certificates that can be used for signing documents. The filtered list will appear when users attempt to select a certificate for digitally signing a document.

STIG	Date
Microsoft Office System 2010	2017-06-19

Details

Check Text ( C-34225r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Signing “Key Usage Filtering” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\common\general Criteria: If the value FilterDigitalSignatureCert is REG_DWORD = 1, this is not a finding.

Fix Text (F-29915r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Signing “Key Usage Filtering” to “Enabled”.