iOS Kernel Heap Armageddon - Hakim

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Recap... • public iOS kernel heap research can be summarized as • there is a kernel heap zone allocator • it comes with heap meta data • which can be exploited • here is one possible way Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 4
So what is this talk about? • zone allocator recap • other kernel heap managers / wrappers • recent changes in the allocators • cross zone attacks • kernel level application data overwrite attacks • generic heap massage technique Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 5
Page 1 and 2: http://www.sektioneins.de iOS Kerne
Page 3: DISCLAIMER iOS 6 • is in beta =>
Page 7 and 8: Some Kernel Zones $ zprint kalloc e
Page 9 and 10: iOS Kernel Zone Allocator 101 • k
Page 11 and 12: iOS Kernel Zone Allocator 101 • z
Page 13 and 14: iOS Kernel Zone Allocator 101 • w
Page 15 and 16: Exploiting the freelist in iOS 6
Page 17 and 18: Overview Managers and Wrappers not
Page 19 and 20: kalloc() • kalloc() is a wrapper
Page 21 and 22: kfree() • kfree() is a bit specia
Page 23 and 24: _MALLOC() • _MALLOC() is a wrappe
Page 25 and 26: _MALLOC() in iOS 5.x void *_MALLOC(
Page 27 and 28: What about kern_os_malloc(), new an
Page 29 and 30: mcache / slab could and might fill
Page 31 and 32: kernel_memory_allocate • “maste
Page 33 and 34: Cross Zone Attacks • what is the
Page 35 and 36: Visualization of Zone Page Allocati
Page 55 and 56:
Visualization of Zone Page Allocati
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Zone Page Allocation Distribution (
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Cross Memory Allocator Attacks •
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iOS Kernel C++ • iOS kernel‘s l
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OSObject Memory Layout 0x00 0x04 vt
Page 69 and 70:
Overwriting an OSObject in Memory
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OSArray Memory Layout and Overwriti
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“Generic“ Technique to control
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Heap Feng Shui / Heap Massage / ...
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OSUnserializeXML() • deserializat
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How does the parser work? (II) •
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How does the parser work? (IV) •
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How does the parser work? (VI) •
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How does the parser work? (VIII)
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Heap Spraying (Remember?) • alloc
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Heap Spraying • allocate repeated
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Heap Spraying • allocate repeated
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Fill Arbitrary Sized Memory Blocks
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Poking Holes into Allocated Data
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Extra: Keeping Data Allocated • s
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iOS Kernel Heap Armageddon - Hakim

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