There's a device called a USB filter that turns every USB port into a charge-only port, and protects against sketchy charging ports. Add this helpful dongle to your life if you travel a lot:https://www.amazon.com/Plugable-Universal-Charge-Only-Adapter-Android/dp/B00FA9GXKM/ref=sr_1_1?s=wireless&ie=UTF8&qid=1535130533&sr=1-1&keywords=usb+filter …
But those vulnerabilities in Nexus phones are very low-sev. Sniffing IMEI over USB? Who cares?
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It's printed on the SIM trays anyway. It doesn't seem particularly useful as attack surface since you would need a very roundabout exploit of the modem followed by exploiting the OS from there instead of just exploiting the large attack surface of the Linux USB stack.
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Android permits adding USB peripherals (keyboards, mice, joysticks, storage, wired networking and a lot more) while locked, so there are a bunch of different USB drivers as attack surface. Easy to modify the code to only permit new devices when unlocked but hurts accessibility.
End of conversation
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