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From the Schneier on Security blog

This is a scarily impressive vulnerability:

Earlier this year, Apple patched one of the most breathtaking iPhone vulnerabilities ever: a memory corruption bug in the iOS kernel that gave attackers remote access to the entire device­ — over Wi-Fi, with no user interaction required at all. Oh, and exploits were wormable­ — meaning radio-proximity exploits could spread from one nearby device to another, once again, with no user interaction needed.

[…]

Beer’s attack worked by exploiting a buffer overflow bug in a driver for AWDL, an Apple-proprietary mesh networking protocol that makes things like Airdrop work. Because drivers reside in the kernel — ­one of the most privileged parts of any operating system­ — the AWDL flaw had the potential for serious hacks. And because AWDL parses Wi-Fi packets, exploits can be transmitted over the air, with no indication that anything is amiss...