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Pre-release versions of file formats new to Office Products must be blocked.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17322 DTOO210 - Excel SV-33448r1_rule Medium
Description
The Microsoft Office Compatibility Pack for Excel 2010 File Formats installed can open Office Open XML files saved with pre-release versions of Excel 2010. Excel Open XML files usually have the following extensions: .xlsx, .xlsm, .xltx, .xltm, .xlam.
STIG Date
Microsoft Excel 2010 2018-04-04

Details

Check Text ( C-33931r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Office 2010 Converters “Block opening of pre-release versions of file formats new to Excel 2010 through the Compatibility Pack for Office 2010 and Excel 2010 Converter” 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\fileblock

Criteria: If the value Excel12BetaFilesFromConverters is REG_DWORD = 1, this is not a finding.

Fix Text (F-29620r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Office 2010 Converters “Block opening of pre-release versions of file formats new to Excel 2010 through the Compatibility Pack for Office 2010 and Excel 2010 Converter” to “Enabled”.