The Add-In Trust Level must be configured.

From Microsoft Outlook 2013 STIG

Associated with: CCI-001170

SV-53919r1_rule The Add-In Trust Level must be configured.

Vulnerability discussion

Under normal circumstances the installed COM add-ins are applications that have been approved and intentionally deployed by the organization and therefore they should not pose a security threat. However, if malware has infected systems it is possible that the malware will use the COM add-in feature to perform unauthorized actions. This setting enforces the default configuration, and therefore is unlikely to cause significant usability issues for most users.

Check content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> 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\15.0\outlook\security Criteria: If the value AddinTrust is REG_DWORD = 1, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security "Configure Add-In Trust Level" to "Enabled (Trust all loaded and installed COM addins)".

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