Details
Use this setting to ensure PIN access to mailbox data via voice is required.
Rationale:
If PINLess access is enabled, the mailbox data is unsecured and vulnerable to capture when being accessed via the phone
Solution
To implement the recommended state, execute the following PowerShell cmdlet:
Set-UMMailboxPolicy -id MyUMMailboxPolicy -AllowPinlessVoiceMailAccess $false
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Windows.