Application add-ins must be signed by Trusted Publisher.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-26589	DTOO127 - Excel	SV-33850r1_rule		Medium

Description
Office 2010 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 Excel 2010	2018-04-04

Details

Check Text ( C-34192r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Require that application add-ins are signed by Trusted Publisher” must be set to “Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value RequireAddinSig is REG_DWORD = 1, this is not a finding.

Check Text ( C-34192r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Require that application add-ins are signed by Trusted Publisher” must be set to “Enabled".

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

HKCU\Software\Policies\Microsoft\Office\14.0\excel\security

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

Fix Text (F-29886r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Require that application add-ins are signed by Trusted Publisher” to “Enabled".