Legacy format signatures must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17749	DTOO203	SV-52751r3_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 2013 STIG	2019-03-21

Details

Check Text ( C-47080r4_chk )
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Signing "Legacy format signatures" is set to "Enabled". Use the Windows Registry Editor to navigate to the following HKCU\Software\Policies\Microsoft\Office\15.0\common\signatures If the value “EnableCreationOfWeakXPSignatures” is REG_DWORD = 1 for every user profile hive, this is not a finding. Fix Text: Set the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Signing "Legacy format signatures" to "Enabled".

Check Text ( C-47080r4_chk )

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Signing "Legacy format signatures" is set to "Enabled".

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

If the value “EnableCreationOfWeakXPSignatures” is REG_DWORD = 1 for every user profile hive, this is not a finding.

Fix Text: Set the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Signing "Legacy format signatures" to "Enabled".

Fix Text (F-45677r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Signing "Legacy format signatures" to "Enabled".