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Unencrypted passwords must not be sent to third-party SMB Servers.


Overview

Finding ID Version Rule ID IA Controls Severity
V-1141 3.034 SV-29004r2_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 see if there is a way to support encrypted password authentication.
STIG Date
Windows 2008 Domain Controller Security Technical Implementation Guide 2019-06-18

Details

Check Text ( C-62019r1_chk )
Analyze the system using the Security Configuration and Analysis snap-in.
Expand the Security Configuration and Analysis tree view.
Navigate to Local Policies >> Security Options.

If the value for "Microsoft Network Client: Send unencrypted password to third-party SMB servers" is not set to "Disabled", this is a finding.

The policy referenced configures the following registry value:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters\

Value Name: EnablePlainTextPassword

Value Type: REG_DWORD
Value: 0
Fix Text (F-66915r1_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".