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Windows Server 2022 must prevent PKU2U authentication using online identities.


Overview

Finding ID Version Rule ID IA Controls Severity
V-254472 WN22-SO-000280 SV-254472r991589_rule Medium
Description
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.
STIG Date
Microsoft Windows Server 2022 Security Technical Implementation Guide 2024-06-14

Details

Check Text ( C-57957r849230_chk )
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: 0x00000000 (0)
Fix Text (F-57908r849231_fix)
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".