Microsoft Windows Server 2025

Windows Server 2025 services using Local System that use Negotiate when reverting to NTLM authentication must use the computer identity instead of authenticating anonymously

STIG ID: WN25-SO-000260 | SRG: SRG-OS-000480-GPOS-00227 | Severity: Medium | CCI: CCI-000366 | Vulnerability ID: V-278220

Description

Services using Local System that use Negotiate when reverting to NTLM authentication may gain unauthorized access if allowed to authenticate anonymously versus using the computer identity.

Check

C-82750r1181364_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\

Value Name: UseMachineId

Type: REG_DWORD
Value: 0x00000001 (1)

Fix

F-82655r1181365_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network security: Allow Local System to use computer identity for NTLM to "Enabled".