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Trust access for VBA must be disallowed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17522 DTOO146 - Word SV-33615r1_rule ECSC-1 Medium
Description
VSTO projects require access to the Visual Basic for Applications project system in Excel, PowerPoint, and Word, even though the projects do not use Visual Basic for Applications. Design-time support of controls in both Visual Basic and C# projects depends on the Visual Basic for Applications project system in Word and Excel. By default, Excel, Word, and PowerPoint do not allow automation clients to have programmatic access to VBA projects. Users can enable this by selecting the Trust access to the VBA project object model in the Macro Settings section of the Trust Center. However, doing so allows macros in any documents the user opens to access the core Visual Basic objects, methods, and properties, which represents a potential security hazard.
STIG Date
Microsoft Word 2010 2012-10-02

Details

Check Text ( C-34081r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Word 2010 -> Word Options -> Security -> Trust Center “Trust access to Visual Basic Project” must be set to “Disabled”.

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

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

Criteria: If the value AccessVBOM is REG_DWORD = 0, this is not a finding.
Fix Text (F-29758r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Word 2010 -> Word Options -> Security -> Trust Center “Trust access to Visual Basic Project” to “Disabled”.