Attacking the Vista Heap - 2008

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Off-by-one III • Trigger allocations of <strong>the</strong> new size, <strong>Heap</strong>Alloc will eventually return free chunk off-by-one chunk free chunk interesting data SIZE FLAGS CHECK SUM … DATA • Checksum will fail, but heap continues… • Application still using interesting data, but can be overwritten using new allocation
Off-by-one IV Off-by-one overflow requirements: • Not opted-in for termination on heap corruption • Position off-by-one chunk next to an appropriate envelope chunk • Know exact sizes of free and interesting chunks • Sufficient control of returned chunk to control interesting data
Page 1 and 2:
Attacking the Vista Heap Ben Hawkes
Page 3 and 4:
The Heap
Page 5 and 6:
Heap Exploit • An “exploit” p
Page 7 and 8:
Intro-clusion 2 • Heap exploits a
Page 9 and 10:
Heap Chunk • HeapAlloc returns a
Page 11 and 12:
Unlink • Solar Designer haxed net
Page 13 and 14:
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
Page 21 and 22:
hHeap HANDLE payload
Page 23 and 24:
Heap API
Page 25 and 26:
Heap API HANDLE hHeap LPVOID chunk
Page 27 and 28:
Heap HANDLE II • Unfortunately th
Page 29 and 30:
Heap HANDLE II • Set a Heap HANDL
Page 31 and 32:
Arbitrary Free
Page 33 and 34:
Arbitrary Free I • Assume you can
Page 35 and 36:
Arbitrary Free III Arbitrary Free (
Page 37 and 38: Vista Arbitrary Free II • Is ther
Page 39 and 40: Vista Arbitrary Free IV • Partial
Page 41 and 42: Vista Arbitrary Free VI Vista Arbit
Page 43 and 44: Vista Heap Changes • List integri
Page 45 and 46: Securing the Heap II - Generic •
Page 47 and 48: Food for Thought • Fundamentally
Page 49 and 50: 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: Off-by-one II • Modify free chunk
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 and 104: LFH header overflow I • Given an
Page 105 and 106: LFH header overflow II LFH_HEAP_ENT
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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