iPhone: unlock for any iPhone 3G possible?

George Hotz dürfte einigen noch ein Begriff sein. Der US-Student war der zweite, der anfangs ein 4GB iPhone der ersten Generation hackte und (sich selbiges von einem Unternehmer mit einem Nissan 350Z und drei 8GB iPhones) bezahlen ließ. Nachdem nun einige Zeit nichts mehr von ihm in der iPhone Szene zu hören war, meldete er sich letzte Woche mit einem äußerst interessanten Blogbeitrag zurück:

5.8 Exploit
I’ve been off the iPhone scene for a while. A couple days ago, I got an e-mail from Chronic asking for help with the new asr. I helped out with genpass, and started reading through theiphonewiki again. Thanks so much for all the information contributed so far; it prompted me to find this.

In bootloader 5.8 on the 3G, the loader signature validator is broken. Someone botched an if statement checking the location and length of the loader in the cert. Because of this, you can pass the run cert for the firmware you currently have on the phone instead of the loader cert, and send whatever you want as a loader.

Here is a bspatch file to be applied to ICE2_02.28.00.fls allowing downgrades from 2.30.03 using BBUpdaterExtreme. By replacing the patched cert with your current run cert, you can downgrade from any other version.

Unfortunately, most 3G’s out there are bootloader 5.9 I was hoping, since RSA was added to the bootrom, that it would run the vulnerable ramstrapper, but I had no luck, although I didn’t try that hard. I see no reason why it shouldn’t work theoretically; the bootrom RSA is complicated, maybe when I finish EDA…

And dev, since you’re into hashes
882B7B3E84B76125755A84FB0BE52B9D8E25284D