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Alloc8 Untethered bootroom exploit released for iPhone 3GS

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Alloc8 Untethered bootroom exploit released for iPhone 3GS

We may find ourselves sitting with iPhone 7/7 Plus in our hands, and talking enthusiastically about what Apple has planned for this year’s anniversary edition iPhone, but attention today has taken a trip through the sands of time, focusing intently on Apple’s iPhone 3GS.

Released by Twitter user axi0mX, the exploit is called alloc8, and makes use of a vulnerability in the malloc function in the bootrom. The details of the exploit and how it works can be found on axi0mX’s GitHub page, where there is a comprehensive write-up. The majority of the write-up went over my head, but may prove invaluable to those trying to increase their knowledge of iOS exploitation and jailbreaking in general.

The original iPhone 3GS had a vulnerability in the bootrom which was exploited by 24Kpwn. Because of the low level nature of bootrom exploits, they give total control over upgrading, downgrading, untethered jailbreaking, and installing of custom firmwares, and are therefore considered incredibly serious by Apple, and incredibly valuable by developers. They can only be patched by a hardware update, not by any software measure or firmware update. No recent jailbreak has made use of such a vulnerability, and none have even been made public for any device since the iPhone 4. 24Kpwn was sufficiently worrying to Apple that they actually released a refresh of the iPhone 3GS halfway through its release cycle, with a new bootrom.

This new exploit works on both the old and new revisions of the iPhone 3GS bootrom, and due to Apple’s inability to patch or release new revisions, means that the device is now permanently pwned. Doubtless this will mean little to the majority of people for whom the 3GS is now a distant memory, but it could allow for more research to be done into the iPhone’s early boot components, and even if not, is a very impressive feat.

alloc8 brings freedom to millions of iPhone 3GS devices, forever, by exploiting a powerful vulnerability in function malloc in the bootrom. Both revisions of iPhone 3GS bootrom are vulnerable, but old bootrom is also vulnerable to 24Kpwn, which is faster than alloc8.

From a features perspective, the developer has listed a few on the official GitHub page, such as being able to jailbreak iPhone 3GS with the new bootrom. There’s also an extensive write-up on the discovery and instructions on how to get up and running the ipwndfu tool that puts this new alloc8 exploit to work.

We would possibly in finding ourselves sitting with iPhone 7/7 Plus in our palms, and speaking enthusiastically about what Apple has deliberate for this yr’s anniversary version iPhone, however consideration these days has taken a go back and forth thru the sands of time, focusing closely on Apple’s iPhone 3GS.

Released via Twitter consumer axi0mX, the exploit is known as alloc8, and uses a vulnerability within the malloc serve as within the bootrom. The main points of the exploit and the way it works may also be discovered on axi0mX’s GitHub page, the place there's a comprehensive write-up. Nearly all of the write-up went over my head, however would possibly turn out valuable to these looking to building up their wisdom of iOS exploitation and jailbreaking generally.


The unique iPhone 3GS had a vulnerability within the bootrom which used to be exploited by way of 24Kpwn. As a result of the low degree nature of bootrom exploits, they provide overall keep an eye on over upgrading, downgrading, untethered jailbreaking, and putting in of customized firmwares, and are subsequently thought to be extremely critical by way of Apple, and extremely precious by way of developers. They may be able to most effective be patched via a hardware update, now not through any tool measure or firmware update. No fresh jailbreak has made use of this kind of vulnerability, and none have even been made public for any tool because the iPhone 4. 24Kpwn used to be sufficiently being worried to Apple that they in fact released a refresh of the iPhone 3GS midway thru its unencumber cycle, with a brand new bootrom.

This new exploit works on each the previous and new revisions of the iPhone 3GS bootrom, and because of Apple’s incapability to patch or unencumber new revisions, signifies that the tool is now completely pwned. Without doubt this may imply little to nearly all of other folks for whom the 3GS is now a far away reminiscence, however it would permit for extra analysis to be executed into the iPhone’s early boot parts, and although now not, is an overly spectacular feat.
alloc8 brings freedom to hundreds of thousands of iPhone 3GS units, eternally, via exploiting an impressive vulnerability in serve as malloc in the bootrom. Each revisions of iPhone 3GS bootrom are prone, however previous bootrom could also be liable to 24Kpwn, which is quicker than alloc8.
From a options viewpoint, the developer has indexed a couple of at the legitimate GitHub page, corresponding to with the ability to jailbreak iPhone 3GS with the brand new bootrom. There’s additionally an in depth write-up at the discovery and directions on the right way to rise up and operating the ipwndfu device that places this new alloc8 exploit to paintings.



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