Four separate security bugs would give attackers almost complete control and persistence over targeted devices, thanks to a faulty update mechanism.
Discovery of 56 OT Device Flaws Blamed on Lackluster Security Culture
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Culture of ‘insecure-by-design’ security is cited in discovery of bug-riddled operational technology devices.
https://threatpost.com/discovery-of-56-ot-device-flaws-blamed-on-lackluster-security-culture/180035/