Legacy format signatures must be enabled.

From Microsoft Office System 2013 STIG

Part of DTOO203 - Legacy Format signatures

Associated with: CCI-000366

SV-52751r2_rule Legacy format signatures must be enabled.

Vulnerability discussion

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.

Check content

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 hive: HKEY_Users For every users profile hive under HKEY_Users, navigate to the following key: \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

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

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