Microsoft Windows Server 2016
NTLM must be prevented from falling back to a Null session
STIG ID:
WN16-SO-000330
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SRG:
SRG-OS-000480-GPOS-00227
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Severity:
Medium
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CCI:
CCI-000366
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Vulnerability ID:
V-225050
Description
NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.
Check
If the following registry value does not exist or is not configured as specified, this is a finding.Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SYSTEM\CurrentControlSet\Control\LSA\MSV1_0\Value Name: allownullsessionfallbackType: REG_DWORDValue: 0x00000000 (0)
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".