Excel attachments opened from Outlook must be in Protected View.

From Microsoft Excel 2013 STIG

Part of DTOO293 - Turn off Protected View for attachments

SV-53837r1_rule Excel attachments opened from Outlook must be in Protected View.

Vulnerability discussion

This policy setting allows for determining whether Excel files in Outlook attachments open in Protected View. If enabling this policy setting, Outlook attachments do not open in Protected View. If disabling or not configuring this policy setting, Outlook attachments open in Protected View.

Check content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View Turn off Protected View for attachments opened from Outlook" must be set to Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\Excel\security\protectedview Criteria: If the value DisableAttachmentsInPV is REG_DWORD = 0, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Protected View "Turn off Protected View for attachments opened from Outlook" to "Disabled".

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