Over The Air: Exploiting Broadcom’s Wi-Fi Stack (Project Zero)

Here's a lengthy and detailed description of how the Project Zero team reverse engineered Broadcom's proprietary WiFi processor and developed a remote code execution exploit. "All that said and done, the introduction of Wi-Fi FullMAC chips does not come without a cost. Introducing these new pieces of hardware, running proprietary and complex code bases, may weaken the overall security of the devices and introduce vulnerabilities which could compromise the entire system."

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