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Open/Save actions for Excel 4 workbooks must be blocked.


Overview

Finding ID Version Rule ID IA Controls Severity
V-26608 DTOO106 - Excel SV-34272r1_rule Medium
Description
This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.
STIG Date
Microsoft Excel 2010 2018-04-04

Details

Check Text ( C-34201r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 workbooks” must be “Enabled: Open/Save blocked, use open policy".

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 XL4Workbooks is REG_DWORD = 2, this is not a finding.
Fix Text (F-29895r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 workbooks” to “Enabled: Open/Save blocked, use open policy".