WD My Cloud NAS devices have hard-wired backdoor

WD mostly markets the My Cloud range as suited for file sharing and backup in domestic settings. But several of the models with the backdoor are four-disk machines suitable for use as shared storage in small business and also capable of being configured as iSCSI targets for use supporting virtual servers. Throw in the fact that some of the messed-up machines can reach 40TB capacity and there's the very real prospect that sizeable databases are dangling online.