Disable dynamic caching of the form template in InfoPath eMail forms.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17654	DTOO169	SV-53378r1_rule		Medium

Description
By default, InfoPath 2007 caches form templates when they are attached to a mail item that is recognized as an InfoPath e-mail form. When users fill out forms that open 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.

Description

By default, InfoPath 2007 caches form templates when they are attached to a mail item that is recognized as an InfoPath e-mail form. When users fill out forms that open 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.

STIG	Date
Microsoft InfoPath 2013 STIG	2018-04-03

Details

Check Text ( C-47624r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2013 -> 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\15.0\InfoPath\deployment Criteria: If the value CacheMailXSN is REG_DWORD = 0, this is not a finding.

Check Text ( C-47624r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2013 -> 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\15.0\InfoPath\deployment

Criteria: If the value CacheMailXSN is REG_DWORD = 0, this is not a finding.

Fix Text (F-46302r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft InfoPath 2013 -> InfoPath e-mail forms "Disable dynamic caching of the form template in InfoPath e-mail forms" to "Enabled".