Remotely Compromising Android and iOS via a bug in Broadcom's WI-FI Chipsets

The article mentions

> Broadpwn is a fully remote attack against Broadcom’s BCM43xx family of WiFi chipsets, which allows for code execution on the main application processor in both Android and iOS.

But it doesn't go into any details on this privilege escalation actually works for iOS and more specifically that it doesn't require additional exploits. Can anyone explain this in more detail? If this actually allows code execution on iOS application processor, that means we have a jailbreak right?

The block diagram shows a PCIE connection to the application processor, which enables DMA. Most modern systems have a MMU to prevent the peripheral from DMAing to memory areas not specifically reserved for it, but given (certainly Android) systems run oldschool kernels hacked together by the last kind of crowd you want working on them it's probably not enabled or setup correctly.

The other more obvious privilege escalation is that there is still a kernel driver on the application processor talking to the chipset. There is per se no reason to distrust data coming from the chipset, so these often aren't written as defensive as they should be and could contain trivially exploitable assumptions on what the chipset will send and do.