Disable 'Insecure guest logons' in SMB

Determines whether insecure guest logons are used by file servers to allow unauthenticated access to shared folders.

Potential risk

Insecure guest logons allow unauthenticated access to shared folders and retreive sensitive data, as well as place malicious files. Shared resources on a system must require authentication to establish proper access.

Remediation options

Set the following registry value:
HKLM\SOFTWARE\Policies\Microsoft\Windows\lanmanworkstation\AllowInsecureGuestAuth

To the following REG_DWORD value:
0