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Windows Server 2022 LAN Manager authentication level must be configured to send NTLMv2 response only and to refuse LM and NTLM.


Overview

Finding ID Version Rule ID IA Controls Severity
V-254475 WN22-SO-000310 SV-254475r849241_rule High
Description
The Kerberos v5 authentication protocol is the default for authentication of users who are logging on to domain accounts. NTLM, which is less secure, is retained in later Windows versions for compatibility with clients and servers that are running earlier versions of Windows or applications that still use it. It is also used to authenticate logons to standalone or nondomain-joined computers that are running later versions.
STIG Date
Microsoft Windows Server 2022 Security Technical Implementation Guide 2022-08-25

Details

Check Text ( C-57960r849239_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: LmCompatibilityLevel

Value Type: REG_DWORD
Value: 0x00000005 (5)
Fix Text (F-57911r849240_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network security: LAN Manager authentication level to "Send NTLMv2 response only. Refuse LM & NTLM".