Legacy format signatures must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17749	DTOO203 - Office System	SV-33473r1_rule		Medium

Description
Office applications use the XML–based XMLDSIG format to attach digital signatures to documents, including Office 97-2003 binary documents. XMLDSIG signatures are not recognized by Office 2003 applications or previous versions. If an Office user opens an Excel, PowerPoint, or Word binary document with an XMLDSIG signature attached, the signature will be lost.

STIG	Date
Microsoft Office System 2010 STIG	2018-04-04

Details

Check Text ( C-33956r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Signing “Legacy format signatures” 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\signatures Criteria: If the value XPCompatibleSignatureFormat is REG_DWORD = 1, this is not a finding.

Fix Text (F-29645r1_fix)
Set he policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Signing “Legacy format signatures” to “Enabled”.