PKU2U authentication using online identities must be prevented.

From Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide

Part of PKU2U Online Identities Authentication

Associated with: CCI-000366

SV-53178r1_rule PKU2U authentication using online identities must be prevented.

Vulnerability discussion

PKU2U is a peer-to-peer authentication protocol. This setting prevents online identities from authenticating to domain-joined systems. Authentication will be centrally managed with Windows user accounts.

Check content

If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Control\LSA\pku2u\ Value Name: AllowOnlineID Type: REG_DWORD Value: 0

Fix text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Network security: Allow PKU2U authentication requests to this computer to use online identities" to "Disabled".

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