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Unencrypted passwords must not be sent to third-party Server Message Block (SMB) servers.


Overview

Finding ID Version Rule ID IA Controls Severity
V-225041 WN16-SO-000210 SV-225041r569186_rule Medium
Description
Some non-Microsoft SMB servers only support unencrypted (plain-text) password authentication. Sending plain-text passwords across the network when authenticating to an SMB server reduces the overall security of the environment. Check with the vendor of the SMB server to determine if there is a way to support encrypted password authentication.
STIG Date
Microsoft Windows Server 2016 Security Technical Implementation Guide 2021-03-05

Details

Check Text ( C-26732r466025_chk )
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\Services\LanmanWorkstation\Parameters\

Value Name: EnablePlainTextPassword

Value Type: REG_DWORD
Value: 0x00000000 (0)
Fix Text (F-26720r466026_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft Network Client: Send unencrypted password to third-party SMB servers" to "Disabled".