Difference between revisions of "X-Gold 608 Unlock"

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(RAM Unlock History)
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[[User:Oranav|Oranav]] discovered another exploit (the [[AT+XLOG Vulnerability]]), and shared it with the iPhone Dev Team for the next unlock. The iPhone Dev Team kept it under wraps to target firmware 3.0 and the [[N88ap|iPhone 3GS]]. The unlock, codenamed [[ultrasn0w]], was released to the public on 23 June 2009 for baseband [[4.26.08]] only. [http://blog.iphone-dev.org/post/128573459]
 
[[User:Oranav|Oranav]] discovered another exploit (the [[AT+XLOG Vulnerability]]), and shared it with the iPhone Dev Team for the next unlock. The iPhone Dev Team kept it under wraps to target firmware 3.0 and the [[N88ap|iPhone 3GS]]. The unlock, codenamed [[ultrasn0w]], was released to the public on 23 June 2009 for baseband [[4.26.08]] only. [http://blog.iphone-dev.org/post/128573459]
   
After Apple released iOS 3.1, patching the [[AT+XLOG Vulnerability]], a new unlock named [[blacksn0w]] was released by [[geohot]] on 3 November 2009 for baseband [[5.11.07]].
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iOS 3.1 contained a baseband [[5.11.07]], which patched the [[AT+XLOG Vulnerability]]. The [[AT+XEMN Heap Overflow]] was exploited in a new unlock named [[blacksn0w]], released by [[User:Geohot|geohot]] on 3 November 2009. A few months later, the vulnerability was patched in baseband [[5.12.01]].
   
When iOS 4.0 was publicly released, an updated release of [[ultrasn0w]] was released, providing an unlock for all the baseband versions found in OTB 3.0 through 4.0 iOS releases.
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When iOS 4.0 was publicly released, an updated release of [[ultrasn0w]] was released, using the [[AT+XAPP Vulnerability]] to unlock all basebands found in firmwares 3.0 through 4.0. Apple countered this with [[5.14.02|a baseband update]] in iOS 4.1.
   
 
==Possible Methods==
 
==Possible Methods==

Revision as of 06:02, 10 September 2010

Until recently, the 3G software unlock was the biggest missing piece of the iPhone community. It proved more difficult than the previous unlocks due to the fact that the baseband bootloader is signature checked by the bootrom. The iPhone Dev Team has successfully unlocked baseband firmwares by overriding carrier locks on-the-fly in RAM, therefore at boot the baseband bootrom can validate the bootloader, and the bootloader can validate the baseband.

RAM Unlock History

On December 21, 2008, MuscleNerd demonstrated yellowsn0w, the first unlock.[1] Originally, yellowsn0w was designed for basebands 2.04.03 and earlier, until geohot shared the AT+stkprof Exploit with them. On January 27, 2009, Apple released iOS 2.2.1, which contained baseband 2.30.03 and patched said exploit.

Oranav discovered another exploit (the AT+XLOG Vulnerability), and shared it with the iPhone Dev Team for the next unlock. The iPhone Dev Team kept it under wraps to target firmware 3.0 and the iPhone 3GS. The unlock, codenamed ultrasn0w, was released to the public on 23 June 2009 for baseband 4.26.08 only. [2]

iOS 3.1 contained a baseband 5.11.07, which patched the AT+XLOG Vulnerability. The AT+XEMN Heap Overflow was exploited in a new unlock named blacksn0w, released by geohot on 3 November 2009. A few months later, the vulnerability was patched in baseband 5.12.01.

When iOS 4.0 was publicly released, an updated release of ultrasn0w was released, using the AT+XAPP Vulnerability to unlock all basebands found in firmwares 3.0 through 4.0. Apple countered this with a baseband update in iOS 4.1.

Possible Methods

Class 1

  • Find an exploit in the bootrom to break the chain of trust. The Dev-Team successfully dumped the bootrom, but they won't release it as it's copyrighted code.
  • Improve by several orders of magnitude the NCK brute forcer, and find a way to extract the CHIPID and NORID
  • Find the theorized algorithm of NCK generation
  • Factorize the RSA keys used for signing
  • Find a second preimage for a signature

Class 2

  • Use a SIM hack such as the TurboSIM Unlock
  • Find a way to patch running memory to "unlock" the phone on every bootup. This is how ultrasn0w works.
  • Find an exploit in the Baseband Bootloader so you can downgrade the baseband, then use ultrasn0w. Geohot and the iPhone Dev Team found (independently) an exploit in bootloader 5.8, but it isn't useful enough as only very-early (week<30) iPhone 3G units have bootloader 5.8.

Resources