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Difference between revisions of "AT+XEMN Heap Overflow"

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AT+XEMN is a command on baseband 5.11.07 (pushed out with the 3.1 release), which when exploited correctly, causes a heap overflow allowing the crash to be moulded into an injection vector. This injection vector can then be used to inject an unlocking payload to provide a coveted Software SIM Unlock on the official 3.1(.2) firmware running 5.11.07
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Hacked by Chroniccommand
  
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== Credit ==
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* '''Vulnerability''': [[User:Oranav|Oranav]] (July) and [[User:iH8sn0w|iH8sn0w]] (September) (discovered independently)<br>
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* '''Exploit''': [[User:geohot|geohot]]
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== Implementation ==
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This exploit is used in [[blacksn0w]].
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== Exception Dump ==
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+XLOG: Exception Number: 1
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Trap Class: 0xDDDD (SW GENERATED TRAP)
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Identification: 140 (0x008C)
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Date: 22.10.2009
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Time: 00:30
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File: atform/text/_malloc.c
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Line: 1036
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Logdata:
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2E 0C 76 ED 40 14 31 64 61 74 63 3A 31 00 64 63 ..v.@.1datc:1.dc
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20 44 F4 E9 20 20 20 20 20 20 20 20 20 20 20 20 D..
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== Timeline ==
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=== July 2009 ===
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*[[User:Oranav|Oranav]] discovers this crash and gives is to the [[iPhone Dev Team]].
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*Upon initial investigation, The [[iPhone Dev Team]], mistakenly concludes that the crash is non-exploitable.
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=== September 2009 ===
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*iH8sn0w discovered this command independently but kept it a secret for about a month. [http://twitter.com/iH8sn0w/status/4353547726 ]
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=== October 2009 ===
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*When the Dev-Team stated that iH8sn0w did not have a unlock, he posted the command on Twitter. [http://twitter.com/iH8sn0w/status/4954333558]
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*Shortly after, Oranav posted his Hash from July. [http://pastebin.ca/1485104]
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*MuscleNerd tells iHacker that the crash was received awhile ago and is thought to be non-exploitable. [http://twitter.com/MuscleNerd/status/4978871033][http://twitter.com/iHacker/status/4978821448]
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*[[User:Geohot|Geohot]] attempts to exploit this crash, but intially also finds it to be non-exploitable. [http://twitter.com/geohot/status/4979506974]
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*Geohot does more investigation and discovers that this crash is indeed exploitable, and that it's a heap overflow. [http://twitter.com/geohot/status/5196861045]
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*Geohot achieves arbitrary code execution and begins work on unlock which will be called blacksn0w. [http://iphonejtag.blogspot.com/2009/10/heap-of-trouble.html]
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*Geohot posts a video of an unlocked 05.11.07 device. [http://www.youtube.com/watch?v=g23e9e9zOVI]
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=== November 2009 ===
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*Geohot releases [[blacksn0w]] to the masses.
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[[Category:Baseband Exploits]]

Revision as of 20:12, 6 November 2009

AT+XEMN is a command on baseband 5.11.07 (pushed out with the 3.1 release), which when exploited correctly, causes a heap overflow allowing the crash to be moulded into an injection vector. This injection vector can then be used to inject an unlocking payload to provide a coveted Software SIM Unlock on the official 3.1(.2) firmware running 5.11.07

Credit

  • Vulnerability: Oranav (July) and iH8sn0w (September) (discovered independently)
  • Exploit: geohot

Implementation

This exploit is used in blacksn0w.

Exception Dump

+XLOG: Exception Number: 1
Trap Class:     0xDDDD  (SW GENERATED TRAP)
Identification: 140 (0x008C)
Date: 22.10.2009
Time: 00:30
File: atform/text/_malloc.c
Line: 1036
Logdata:
 2E 0C 76 ED 40 14 31 64 61 74 63 3A 31 00 64 63   ..v.@.1datc:1.dc
 20 44 F4 E9 20 20 20 20 20 20 20 20 20 20 20 20    D..            
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20                   
 20 20 20 20 20 20 20 20

Timeline

July 2009

September 2009

  • iH8sn0w discovered this command independently but kept it a secret for about a month. [1]

October 2009

  • When the Dev-Team stated that iH8sn0w did not have a unlock, he posted the command on Twitter. [2]
  • Shortly after, Oranav posted his Hash from July. [3]
  • MuscleNerd tells iHacker that the crash was received awhile ago and is thought to be non-exploitable. [4][5]
  • Geohot attempts to exploit this crash, but intially also finds it to be non-exploitable. [6]
  • Geohot does more investigation and discovers that this crash is indeed exploitable, and that it's a heap overflow. [7]
  • Geohot achieves arbitrary code execution and begins work on unlock which will be called blacksn0w. [8]
  • Geohot posts a video of an unlocked 05.11.07 device. [9]

November 2009

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