Title

Unencrypted passwords must not be sent to third-party SMB Servers. (Cat II impact)

Discussion

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 Content

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: 0

Fix Text

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".

Additional Identifiers

Rule ID: SV-253450r877396_rule

Vulnerability ID: V-253450

Group Title: SRG-OS-000074-GPOS-00042

Expert Comments

CCIs tied to check.

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