Attacking the Vista Heap - 2008

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LFH header overflow I • Given an overflow that can write NULL bytes, what do we gain? • Small overflow envelope technique on LFH chunks even with a terminating heap
LFH header overflow II LFH_HEAP_ENTRY: CONTEXT INDEX FLAGS 0 4 6 7 • RtlpLowFrag<strong>Heap</strong>Free uses INDEX to determine adjusted location of chunk before checksum test • Only when FLAGS == 5 and CONTEXT == 0x0000002
Page 1 and 2:
Attacking the Vista Heap Ben Hawkes
Page 3 and 4:
The Heap
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Heap Exploit • An “exploit” p
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Intro-clusion 2 • Heap exploits a
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Heap Chunk • HeapAlloc returns a
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Unlink • Solar Designer haxed net
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Unlink • HISTORY: control the fwd
Page 15 and 16:
Current Heap Exploitation • So ev
Page 17 and 18:
Attacking the Application • At th
Page 19 and 20:
Attacking the Vista Heap • The te
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hHeap HANDLE payload
Page 23 and 24:
Heap API
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Heap API HANDLE hHeap LPVOID chunk
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Heap HANDLE II • Unfortunately th
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Heap HANDLE II • Set a Heap HANDL
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Arbitrary Free
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Arbitrary Free I • Assume you can
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Arbitrary Free III Arbitrary Free (
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Vista Arbitrary Free II • Is ther
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Vista Arbitrary Free IV • Partial
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Vista Arbitrary Free VI Vista Arbit
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Vista Heap Changes • List integri
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Securing the Heap II - Generic •
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Food for Thought • Fundamentally
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Rant Off • We need an architectur
Page 51 and 52:
Summary • Heap vulnerabilities ar
Page 53 and 54: Appendix 1 - page 54 - hHeap overfl
Page 55 and 56: ASLR HeapCreate: 1 2 3 4 randPad =
Page 57 and 58: Large Chunk Allocation RtlpAllocate
Page 59 and 60: Heap Spray II - the stats • Say N
Page 61 and 62: Guarding hHeap • Notice lack of g
Page 63 and 64: hHeap overflows I • Overflow in c
Page 65 and 66: hHeap overflows IV • Pattern 1: -
Page 67 and 68: hHeap overflows VI • Pattern 3: -
Page 69 and 70: hHeap payload hHeap (X) … A … B
Page 75 and 76: hHeap payload hHeap (X) … B … C
Page 77 and 78: Adjusted Double Free I • Applicat
Page 79 and 80: Adjusted Double Free III • At thi
Page 81 and 82: Adjusted Double Free V Adjusted Dou
Page 83 and 84: Heap termination I BOOL SetHeapOpti
Page 85 and 86: Heap termination III • Must opt-i
Page 87 and 88: Off-by-one II • Modify free chunk
Page 89 and 90: Off-by-one IV Off-by-one overflow r
Page 91 and 92: Vista Chunks • Every chunk has a
Page 93 and 94: Canary leak • Leak of a chunk hea
Page 95 and 96: LFH bucket overflow I • LFH bucke
Page 97 and 98: LFH bucket overflow II • LFH buck
Page 99 and 100: LFH bucket overflow IV • Set ent_
Page 101 and 102: LFH bucket overflow V • Y is used
Page 103: LFH header overflow I • Given an
Page 107 and 108: LFH header overflow IV LFH Chunk la
Page 109: LFH header overflow VI LFH header o
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Attacking the Vista Heap - 2008

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