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NTLM will be prevented from falling back to a Null session.


Overview

Finding ID Version Rule ID IA Controls Severity
V-21952 3.152 SV-32446r1_rule Medium
Description
This setting prevents NTLM from falling back to a Null (unauthenticated) session.
STIG Date
Windows Server 2008 R2 Domain Controller Security Technical Implementation Guide 2019-06-18

Details

Check Text ( C-32912r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in.
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies -> Security Options.

If the value for “Network Security: Allow LocalSystem NULL session fallback” is not set to “Disabled”, then this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Subkey: \System\CurrentControlSet\Control\LSA\MSV1_0\

Value Name: allownullsessionfallback

Type: REG_DWORD
Value: 0
Fix Text (F-28857r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> “Network Security: Allow LocalSystem NULL session fallback” to “Disabled”.