The system will be configured to meet the minimum session security requirement for NTLM SSP based clients.

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of Session Security for NTLM SSP Based Clients

Associated with IA controls: ECCT-1, ECCT-2

SV-32341r1_rule The system will be configured to meet the minimum session security requirement for NTLM SSP based clients.

Vulnerability discussion

Windows has implemented a variety of security support providers for use with RPC sessions. In a homogenous Windows environment, all of the options should be enabled and testing should be performed in a heterogeneous environment to determine the maximum-security level that provides reliable functionality.

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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”, ”Require 128-bit encryption” (all options selected).

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