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


Overview

Finding ID Version Rule ID IA Controls Severity
V-26589 DTOO127 SV-53564r1_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 Word 2013 STIG 2018-04-04

Details

Check Text ( C-47716r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Word 2013 -> Word 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\word\security

Criteria: If the value RequireAddinSig is REG_DWORD = 1, this is not a finding.
Fix Text (F-46488r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Word 2013 -> Word Options -> Security -> Trust Center "Require that application add-ins are signed by Trusted Publisher" to "Enabled".