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How does iOS and the iPhone handle this SIM card/baseband processor issue? Is there an article that details the exact threat model and defenses in place?
by natdempk 10y ago
How does iOS and the iPhone handle this SIM card/baseband processor issue? Is there an article that details the exact threat model and defenses in place?
- londons_explore 10y agoiOS uses Qualcomm and Intel chipsets for basebands. For Qualcomm at least, they share a lot of code with Android, and nearly all the code is fully closed source, even to Apple engineers building the phone above. Note that code does everything from camera autofocus to doing NAT for tethering, to audio decoding while the CPU is sleeping, to setting up the GPU, to handling supercomplex GSM protocols, to determining USB charging current and serial debug interfaces. It is probably more complex than the whole of the rest of the OS. Looking at the quality of open source code from Qualcomm, I have nearly zero confidence in the security of that baseband. I'm confident you could find an "accidentally" open debug interface within a few days of looking.