A form that is digitally signed must be displayed with a warning.

From Microsoft InfoPath 2013 STIG

Part of DTOO297 - A form is digitally signed

SV-53432r1_rule A form that is digitally signed must be displayed with a warning.

Vulnerability discussion

This setting controls whether or not the user sees a dialog box when opening Microsoft InfoPath forms containing digitally signed content. By default, InfoPath shows the user a warning message when the form contains a digital signature. By being aware of a digitally signed form, the user will be able to check the validity of the signature. Otherwise, the forms may have been maliciously modified and will be invalidated.

Check content

The policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2013 -> Security "Display a warning that a form is digitally signed" must be set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\InfoPath\security Criteria: If the value SignatureWarning is REG_DWORD = 1, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2013 -> Security "Display a warning that a form is digitally signed" to "Enabled".

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