CIS Microsoft Windows 10 Enterprise Release 1909 Benchmark

Remediation:

To establish the recommended configuration via GP, set the following UI path to Require NTLMv2 session security, Require 128-bit encryption :

Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options\Network security: Minimum session security for NTLM SSP based (including secure RPC) clients

Impact:

NTLM connections will fail if NTLMv2 protocol and strong encryption (128-bit) are not both negotiated. Client applications that are enforcing these settings will be unable to communicate with older servers that do not support them. This setting could impact Windows Clustering when applied to servers running Windows Server 2003, see Microsoft Knowledge Base article 890761: You receive an "Error 0x8007042b" error message when you add or join a node to a cluster if you use NTLM version 2 in Windows Server 2003 for more information on possible issues and how to resolve them.

Default Value:

Require 128-bit encryption. (NTLM connections will fail if strong encryption (128-bit) is not negotiated.)

References:

1. CCE-35447-2

CIS Controls:

Version 6

13 Data Protection Data Protection

Version 7

5.1 Establish Secure Configurations Maintain documented, standard security configuration standards for all authorized operating systems and software.

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