The Add-In Trust Level must be configured.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-228436 | DTOO236 | SV-228436r508021_rule | CCI-001170 | medium |
| Description | ||||
| All installed trusted COM addins can be trusted. Exchange Settings for the addins still override if present and this option is selected. | ||||
| STIG | Date | |||
| Microsoft Outlook 2016 Security Technical Implementation Guide | 2022-03-11 | |||
Details
Check Text (C-228436r508021_chk)
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security "Configure Add-In Trust Level" is set to "Enabled (Trust all loaded and installed COM addins)".
Procedure: Use the Windows Registry Editor to navigate to the following key:
HKCU\Software\Policies\Microsoft\Office\16.0\outlook\security
Criteria: If the value AddinTrust is REG_DWORD = 1, this is not a finding.
Fix Text (F-30654r497631_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security "Configure Add-In Trust Level" to "Enabled (Trust all loaded and installed COM addins)".