Microsoft Windows 10
NTLM must be prevented from falling back to a Null session
STIG ID:
WN10-SO-000180
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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-220934
Description
NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.
Check
C-22649r555287_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: allownullsessionfallbackValue Type: REG_DWORDValue: 0
Fix
F-22638r555288_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".