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WN11-SO-000180 NTLM must be prevented from falling back to a Null session.

DISA STIG library V2R11
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

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

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: allownullsessionfallback Value Type: REG_DWORD Value: 0

Discussion

NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.

Related controls

CCI-000366

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".