Microsoft Windows 10

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

STIG ID: WN10-SO-000110 | SRG: SRG-OS-000074-GPOS-00042 | Severity: Medium | CCI: CCI-000197 | Vulnerability ID: V-220926

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.

Check

C-22641r555263_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\Services\LanmanWorkstation\Parameters\Value Name: EnablePlainTextPasswordValue Type: REG_DWORDValue: 0

Fix

F-22630r555264_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".