SV-223355r961863: The Publish to Global Address List (GAL) button must be disabled in Outlook. | Microsoft Office 365 ProPlus STIG SCAP Benchmark

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Assessment Title

Rule Text

The Publish to Global Address List (GAL) button must be disabled in Outlook.

Description

Discussion Text

This policy setting controls whether Outlook users can publish e-mail certificates to the Global Address List (GAL). If you enable this policy setting, the "Publish to GAL" button does not display in the "E-mail Security" section of the Trust Center. If you disable or do not configure this policy setting, Outlook users can publish their e-mail certificates to the GAL through the "E-mail Security" section of the Trust Center.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-108889V-99785

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:223355
if (Test-Path -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\outlook\security\publishtogaldisabled" -ErrorAction SilentlyContinue -and (Get-ItemProperty -Path "HKCU:\Software\Policies\Microsoft\Office\16.0\outlook\security\publishtogaldisabled" -ErrorAction SilentlyContinue).publishtogaldisabled -eq 1) {Write-Output "PASS"; Exit 0} else {Write-Output "FAIL"; Exit 1}

Remediation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Cryptography >> Do not display 'Publish to GAL' button to "Enabled".