Microsoft Windows Server 2016
PKU2U authentication using online identities must be prevented
STIG ID:
WN16-SO-000340
|
SRG:
SRG-OS-000480-GPOS-00227
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Severity:
Medium
|
CCI:
CCI-000366
|
Vulnerability ID:
V-225051
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.
Check
If the following registry value does not exist or is not configured as specified, this is a finding.Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Control\LSA\pku2u\Value Name: AllowOnlineIDType: REG_DWORDValue: 0x00000000 (0)
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".