"The hub communicates with the Sleep Number servers by opening an SSH tunnel and providing a reverse tunnel back to the hub that their developers can use to connect to the hub and do maintenance when needed. The idea that unknown users can directly connect to my internal home network is a scary thought, so I will probably be disconnecting the hub from the external internet once I am satisfied with my internal network control script. It also makes me wonder how many other internet-connected appliances include a similar backdoor into the home network like this one has."
I would assume that if your device uses "cloud" or "app" anything that it has some sort of method like this. It probably also uses a port about 1024 even if it's SSH so it gets around the typical firewalls which would also be why it opens a reverse shell. Its for firewall traversal. I understand the concept and reason for it but it also is a backdoor into your entire network.
Gives me pause on anything that tries to talk to my router
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