Add-ins to Office applications must be signed by a Trusted Publisher.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-40736	DTOO127	SV-52794r1_rule		Medium

Description
Office 2013 applications do not check the digital signature on application add-ins before opening them. Disabling or not configuring this setting may allow an application to load a dangerous add-in. As a result, malicious code could become active on user computers or the network.

STIG	Date
Microsoft Visio 2013 STIG	2018-04-04

Details

Check Text ( C-47123r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Visio 2013 -> Visio Options -> Security -> Trust Center -> "Require that application add-ins are signed by Trusted Publisher" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\software\policies\Microsoft\office\15.0\Visio\security Criteria: If the value requireaddinsig is REG_DWORD = 1, this is not a finding.

Check Text ( C-47123r1_chk )

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Visio 2013 -> Visio Options -> Security -> Trust Center -> "Require that application add-ins are signed by Trusted Publisher" is set to "Enabled".

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKCU\software\policies\Microsoft\office\15.0\Visio\security

Criteria: If the value requireaddinsig is REG_DWORD = 1, this is not a finding.

Fix Text (F-45720r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Visio 2013 -> Visio Options -> Security -> Trust Center -> "Require that application add-ins are signed by Trusted Publisher" to "Enabled".