Check: O365-EX-000034
Microsoft Office 365 ProPlus STIG:
O365-EX-000034
(in versions v2 r11 through v1 r2)
Title
File attachments from Outlook must be opened in Excel in Protected mode. (Cat II impact)
Discussion
This policy setting allows you to determine if Excel files in Outlook attachments open in Protected View. If you enable this policy setting, Outlook attachments do not open in Protected View. If you disable or do not configure this policy setting, Outlook attachments open in Protected View.
Check Content
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Turn off Protected View for attachments opened from Outlook 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 DisableAttachmentsInPV is REG_DWORD = 0, this is not a finding.
Fix Text
Set policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Turn off Protected View for attachments opened from Outlook to "Disabled".
Additional Identifiers
Rule ID: SV-223343r879630_rule
Vulnerability ID: V-223343
Group Title: SRG-APP-000210
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-001170 |
The information system prevents the automatic execution of mobile code in organization-defined software applications. |
Controls
Number | Title |
---|---|
SC-18 (4) |
Prevent Automatic Execution |