Targeting the iOS Kernel - Reverse Engineering Mac OS X

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Who am I? Stefan Esser • from Cologne/Germany • Information Security since 1998 • PHP Core Developer since 2001 • Suhosin / Hardened-PHP 2004 • Month of PHP Bugs 2007 / Month of PHP Security 2010 • ASLR for jailbroken iPhones 2010 / untethered jailbreak for iOS 4.3.1/2 • Head of Research & Development at SektionEins GmbH Stefan Esser • Targeting the iOS Kernel • April 2011 • 2
Motivation • iPhone security heavily relies on kernel level protections • code signing / sandboxing • NX / ASLR • public iPhone exploit payloads are very limited in what they can do • security researchers have relied on the jailbreakers to provide kernel pwnage • this session is an introduction to finding bugs in the iOS kernel Stefan Esser • Targeting the iOS Kernel • April 2011 • 3
Page 1: Targeting the iOS Kernel Stefan Ess
Page 5 and 6: Part I Introduction Stefan Esser
Page 7 and 8: Finding Vulnerabilities in the iOS
Page 9 and 10: Interesting Kernel Bugs - OS X OS X
Page 11 and 12: Part II The iOS Kernelcache Stefan
Page 13 and 14: Getting the iOS Kernelcache (II)
Page 15 and 16: Kernelcache is just a Mach-O Binary
Page 17 and 18: iOS Kernelcache vs. IDA • IDA can
Page 19 and 20: Helping IDA - Kernel Extensions •
Page 21 and 22: Helping IDA - findAndMarkKEXT.py St
Page 23 and 24: IOKit Driver Classes (I) • IOKit
Page 25 and 26: IOKit Object Hierarchy - Full View
Page 27 and 28: Part IV iOS Kernel Where Are your S
Page 29 and 30: Kernel Symbols - Manual Symbolizati
Page 31 and 32: Zynamic‘s BinDiff • Zynamic‘s
Page 33 and 34: Zynamic‘s BinDiff - Demo (II) Ste
Page 35 and 36: Using IOKit Class Hierarchy for Sym
Page 37 and 38: Exporting Symbols • IDA cannot ex
Page 39 and 40: iOS Kernel Attack Surface • simpl
Page 41 and 42: Finding and Marking the Syscall Tab
Page 43 and 44: Attacking through Network Protocols
Page 45 and 46: Attacking through Network Protocols
Page 47 and 48: Attacking through Devices (II) com.
Page 49 and 50: Dumping List of Sysctl Handlers mai
Page 51 and 52: Attacking from User-Land: IOKit Dri
Page 53 and 54:
iOS Kernel Debugging • no support
Page 55 and 56:
iPhone Dock Connector (Pin-Out) PIN
Page 57 and 58:
Ingredients (I) • 470 kΩ resisto
Page 59 and 60:
Ingredients (III) • FT232RL Break
Page 61 and 62:
Final USB and USB Serial Cable •
Page 63 and 64:
KDP over serial • KDP over serial
Page 65 and 66:
Using GDB... $ /Developer/Platforms
Page 67:
Links • xpwntool - https://github
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Targeting the iOS Kernel - Reverse Engineering Mac OS X

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