Microsoft Windows Server 2022

Windows Server 2022 session security for NTLM SSP-based clients must be configured to require NTLMv2 session security and 128-bit encryption

STIG ID: WN22-SO-000330 | SRG: SRG-OS-000480-GPOS-00227 | Severity: Medium | CCI: CCI-000366 | Vulnerability ID: V-254477

Description

Microsoft has implemented a variety of security support providers for use with Remote Procedure Call (RPC) sessions. All of the options must be enabled to ensure the maximum security level.

Check

C-57962r849245_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\MSV1_0\Value Name: NTLMMinClientSecValue Type: REG_DWORDValue: 0x20080000 (537395200)

Fix

F-57913r849246_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network security: Minimum session security for NTLM SSP based (including secure RPC) clients to "Require NTLMv2 session security" and "Require 128-bit encryption" (all options selected).