[Pen Test Partners] have found some really scary vulnerabilities in AGA range cookers. They are connected by SMS by which a mobile app sends an unauthenticated SMS to the AGA to give it commands for instance preheat the oven, You can also just tell your AGA to turn everything on at once.
The problem is with the web interface; it allows an attacker to check if a user’s cell phone is already registered, allowing for a slow but effective enumeration attack. Once the attacker finds a registered device, all they need to do is send an SMS, as messages are not authenticated by the cooker, neither is the SIM card set up to send the messages validated when registered.
This is quite disturbing, What if someone left a tea towel on the hob or some other flammable material before leaving for work, only to come back to a pile of ashes? This is a six-gazillion BTU stove and oven, after all. It just seems the more connected we are in this digital age the more we end up vulnerable to attacks, companies seem too busy trying to push their products out the door to do simple security checks.
Before disclosing the vulnerability, [Pen Test Partners] tried to contact AGA through Twitter and ended up being blocked. They phoned around trying to get in contact with someone who even knew what IoT or security meant. This took some time but finally they managed to get through to someone from the technical support. Hopefully AGA will roll out some updates soon. The company’s reluctance to do something about this security issue does highlight how sometimes disclosure may not be enough.
[Via Pen Test Partners]
The electronics are based on a Teensy LC programmed to appear as a USB keyboard, and the buttons are standard push buttons. The insides are wired together with nylon conductive tape. LEGO was an appropriate choice because the Teensy and switches are built on top of LEGO compatible PCBs, so components are just snapped in place. The system is called 
