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


Overview

Finding ID Version Rule ID IA Controls Severity
V-3666 WN08-SO-000070 SV-48120r1_rule ECCT-1 ECCT-2 Medium
Description
Microsoft has implemented a variety of security support providers for use with RPC sessions. All of the options must be enabled to ensure the maximum security level.
STIG Date
Windows 8 / 8.1 Security Technical Implementation Guide 2015-11-30

Details

Check Text ( C-44846r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in. (See "Performing Analysis with the Security Configuration and Analysis Snap-in" in the STIG Overview document.)
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for "Network security: Minimum session security for NTLM SSP based (including secure RPC) servers" is not set to "Require NTLMv2 session security" and "Require 128-bit encryption", this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \System\CurrentControlSet\Control\Lsa\MSV1_0\

Value Name: NTLMMinServerSec

Value Type: REG_DWORD
Value: 0x20080000 (537395200)

"Require NTLMv2 session security" will prevent authentication if "Network security: LAN Manager Authentication level" is set to permit NTLM or LM authentication.
Fix Text (F-41257r1_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).