Services using Local System that use Negotiate when reverting to NTLM authentication must use the computer identity instead of authenticating anonymously.

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Services using Local System that use Negotiate when reverting to NTLM authentication must use the computer identity instead of authenticating anonymously.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73679	WN16-SO-000320	SV-88343r1_rule		Medium

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.

STIG	Date
Windows Server 2016 Security Technical Implementation Guide	2020-06-16

Details

Check Text ( C-73761r1_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 Text (F-80129r1_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".