Microsoft Windows Server 2019
Windows Server 2019 must prevent NTLM from falling back to a Null session
STIG ID:
WN19-SO-000270
|
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-205917
Description
NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.
Check
C-6182r356113_chk
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
F-6182r356114_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".