Bluetooth is still the best technology we have in a smartphone to implement exposure notifications. It is safe to use the Corona-Warn-App. Fight me! ;)
How secure is the interface between baseband chips and iOS?
While this interface should protect against escalations from the baseband into operating system components, its implementation is
full of bugs. Fuzzing this interface is not only relevant to security, but also results in various funny effects, since the iPhone looses
information about its identity and location, and eventually ends up in a state with a few thousand unread SMS that can no longer be deleted.
Virtual Pwn Networks (VPNs) add a network layer that should provide privacy and security. The privacy of VPNs clearly depends on their endpoint, thus, many companies run their own instances. We demonstrate that VPNs can be insecure nonetheless, as the users connecting to a company's VPN typically requires proprietary client software on their systems. These proprietary clients lack security, as we show based on the Cisco AnyConnect client for Linux and iOS.