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WN25-SO-000340 Windows Server 2025 session security for NTLM SSP-based servers must be configured to require NTLMv2 session security and 128-bit encryption.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

Windows Server 2025 session security for NTLM SSP-based servers must be configured to require NTLMv2 session security and 128-bit encryption.

Control

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: NTLMMinServerSec Value Type: REG_DWORD Value: 0x20080000 (537395200)

Discussion

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.

Related controls

CCI-000366

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) servers to "Require NTLMv2 session security" and "Require 128-bit encryption" (all options selected).