Untrusted database files must be opened in Excel in Protected View mode.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-99753	O365-EX-000030	SV-108857r2_rule		Medium

Description
This policy setting controls whether database files (.dbf) opened from an untrusted location are always opened in Protected View. If you enable this policy setting, database files opened from an untrusted location are always opened in Protected View. Users will not be able to change this setting under File >> Options >> Trust Center >> Trust Center Settings >> Protected View. If you disable or do not configure this policy setting, database files opened from an untrusted location are not opened in Protected View, unless users have changed this setting in the Trust Center. Note: This policy setting only applies to subscription versions of Office, such as Office 365 ProPlus.

Description

This policy setting controls whether database files (.dbf) opened from an untrusted location are always opened in Protected View. If you enable this policy setting, database files opened from an untrusted location are always opened in Protected View. Users will not be able to change this setting under File >> Options >> Trust Center >> Trust Center Settings >> Protected View. If you disable or do not configure this policy setting, database files opened from an untrusted location are not opened in Protected View, unless users have changed this setting in the Trust Center. Note: This policy setting only applies to subscription versions of Office, such as Office 365 ProPlus.

STIG	Date
Microsoft Office 365 ProPlus Security Technical Implementation Guide	2020-06-17

Details

Check Text ( C-98603r5_chk )
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> External Content >> Protected View Always open untrusted database files in Protected View is set to "Enabled". Use the Windows Registry Editor to navigate to the following key: Microsoft Excel 2016\Excel Options\Security\Trust Center\Protected View If the value for enabledatabasefileprotectedview is REG_DWORD = 1, this is not a finding.

Check Text ( C-98603r5_chk )

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> External Content >> Protected View Always open untrusted database files in Protected View is set to "Enabled".

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

Microsoft Excel 2016\Excel Options\Security\Trust Center\Protected View

If the value for enabledatabasefileprotectedview is REG_DWORD = 1, this is not a finding.

Fix Text (F-105437r4_fix)
Set policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> External Content >> Always open untrusted database files in Protected View to "Enabled".