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Files from Internet zone must be opened in Excel in Protected View mode.


Overview

Finding ID Version Rule ID IA Controls Severity
V-223340 O365-EX-000031 SV-223340r508019_rule Medium
Description
This policy setting allows you to determine if files downloaded from the Internet zone open in Protected View. If you enable this policy setting, files downloaded from the Internet zone do not open in Protected View. If you disable or do not configure this policy setting, files downloaded from the Internet zone open in Protected View.
STIG Date
Microsoft Office 365 ProPlus Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-25013r442239_chk )
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Do not open files from the Internet zone in Protected View is set to "Disabled".

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

HKCU\software\policies\microsoft\office\16.0\excel\security\protectedview

If the value DisableInternetFilesInPV is REG_DWORD = 0, this is not a finding.

If the value does not exist, this is not a finding.

If the value is REG_DWORD = 1, this is a finding.
Fix Text (F-25001r442240_fix)
Set policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Do not open files from the Internet zone in Protected View to "Disabled".