SV-223343r961092: File attachments from Outlook must be opened in Excel in Protected mode. | Microsoft Office 365 ProPlus STIG SCAP Benchmark

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Assessment Title

Rule Text

File attachments from Outlook must be opened in Excel in Protected mode.

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001170SV-108865V-99761

References

DPMS Target Microsoft Office 365 ProPlus DISA DPMS Target Microsoft Office 365 ProPlus 4099

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_office_365_proplus target this check assesses.

# OVAL Definition: oval:mil.disa.stig.office365:def:223343
if (!(Test-Path -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\excel\security\protectedview\DisableAttachmentsInPV")) {exit 1} else {if ((Get-ItemProperty -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\excel\security\protectedview\DisableAttachmentsInPV").DisableAttachmentsInPV -eq 0) {exit 0} else {exit 1}}

Remediation

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".