Title

Dynamic caching of InfoPath eMail forms must be disabled. (Cat II impact)

Discussion

InfoPath caches form templates when they are attached to a mail item recognized as an InfoPath e-mail form. When users fill out forms running with a restricted security level, InfoPath uses the cached version of the mailed template, rather than any published version. To circumvent users filling out a published form, an attacker could e-mail an alternate version of the form, which would return the data to the sender as part of a phishing attack and could be used to gain access to confidential information.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2010 -> InfoPath e-mail forms “Disable dynamic caching of the form template in InfoPath e-mail forms” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\infopath\deployment Criteria: If the value CacheMailXSN is REG_DWORD = 0, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2010 -> InfoPath e-mail forms “Disable dynamic caching of the form template in InfoPath e-mail forms” to “Enabled”.

Additional Identifiers

Rule ID: SV-33629r1_rule

Vulnerability ID: V-17654

Group Title: DTOO169 - Disable dynamic caching / form template

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