The minds behind the SHAtter exploit have decided to lift the veil on the much-anticipated exploit, and have finally started to fill in the blanks on it’s page over at The iPhone Wiki. Once-upon-a-time, there was information about SHAtter written at the wiki, but it was all removed and the page locked to prevent further editing.
Now, it looks like the page has been propagated with some of the backstory behind the exploit, and will continue to expand with more information about the inner workings of SHAtter.
This is an unsigned code execution vulnerability that resides in DFU mode of the S5L8930 bootrom. Uses of this exploit have already involved uploading a pwned iBSS/iBEC to provide access to the AES engine and to run custom ramdisks.
Vulnerability: posixninja (07/05/2010). Research: posixninja, pod2g, also MuscleNerd. Exploit: pod2g (09/09/2010).
In April 2010 pod2g wrote a USB fuzzer and tested every single USB control message possible on his iPod2,1. The fuzzer found 2 vulnerabilities: – a heap overflow caused by the A1,1 control message – a way to dump the bootrom using USB descriptors request
The team tested both PoC on new generation devices (iPhone2,1, iPod3,1, iPad) and both were already fixed by Apple.
posixninja continued the fuzzing on new gens and found that with a particular sequence of USB messages it was possible to dump the BSS+Heap+Stack (on new gens only). Having a memory dump is really helpful to make exploits and it was also the first time we had this kind of dump, previous bootrom exploits (ex: 24kpwn) were done blind!
Also, his first attempts to dump the memory resulted in rebooting the device. Interesting! We’ll see after that this reboot is the base of the SHAtter exploit.
Read on for the rest – or check out the source for the most up-to-date info. (Though the site is under heavy load, and may not work.)
The research started and the main actor of this story is posixninja. He found why the device reboots and proposed different ideas to exploit this. posixninja also reversed tons of assembly code of the bootrom in this period, giving a support discussion to the team. We’re not talking about days, but months of work. So, major props to posixninja: SHAtter would not have been possible without the clever vulnerability he found and the research he did on the bootrom.
In the meanwhile, pod2g helped on the USB reversing side and found a way to have more control over the size of the USB packets sent. The finer-grained control of the packet sizes is the key of SHAtter.
posixninja and pod2g worked on exploiting the vulnerability for days. Every attempt was a failure because the idea to attack the stack and bypass the img3 control routines was just impossible. It took them weeks to understand why they failed and why they couldn’t exploit it this way.
They both gave up in July and focused on other subjects.SHAtter exploit
(details on the SHAtter exploit soon to come)