AT+XEMN Heap Overflow

AT+XEMN is a command, that when issued in minicom, causes a non-exploitable crash for 5.11.07.

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                   
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July 2009

• Oranav discovers this command.
• Shortly after discovered, The iPhone Dev Team, confirms that the command is non-exploitable.
• There was no talk about this command.

September 2009

• iH8sn0w discovered this command but kept it a secret for about a month - http://twitter.com/iH8sn0w/status/4353547726

October 2009

• When the Dev-Team stated that iH8sn0w did not have a unlock, he posted the command on Twitter - http://twitter.com/iH8sn0w/status/4954333558.
• Shortly after, Oranav discovered this, and posted his Hash from July - http://pastebin.ca/1485104.
• MuscleNerd tells iHacker that the command was received awhile ago and was non-exploitable - http://twitter.com/MuscleNerd/status/4978871033 | http://twitter.com/iHacker/status/4978821448
• GeoHot attempts to use this command, but later finds out aswell that it is non-exploitable - http://twitter.com/geohot/status/4979506974
• The hunt for another exploit continues as New 3G/3G[S] users join or if 3G/3G[S] users upgrade to Official Apple Firmware.
• Geohot does more investigation and discovers that this command may indeed be exploitable - http://twitter.com/geohot/status/5196861045