[Bug 1539053] Re: out-of-bounds write in ./MagickCore/quantum-private.h:178

[Moshe Kaplan]

input file to trigger crash

** Attachment added: "id:000081,sig:06,src:000075,op:havoc,rep:16"
   https://bugs.launchpad.net/bugs/1539053/+attachment/4558290/+files/id%3A000081%2Csig%3A06%2Csrc%3A000075%2Cop%3Ahavoc%2Crep%3A16

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Title:
  out-of-bounds write in ./MagickCore/quantum-private.h:178

Status in imagemagick package in Ubuntu:
  New

Bug description:
  This bug was found while fuzzing ImageMagick with afl-fuzz

  Tested on ImageMagick version Tested on git commit
  8bc3ab67d818204fe5f0fe1dc29b873d37360461

  Command: magick id:000081,sig:06,src:000075,op:havoc,rep:16 /dev/null

  =================================================================
  ==12988==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4e029e1 at pc 0x8ecb2cb bp 0xbfa600b8 sp 0xbfa600b0
  WRITE of size 1 at 0xb4e029e1 thread T0
      #0 0x8ecb2ca in PopCharPixel /home/user/Desktop/ImageMagick/./MagickCore/quantum-private.h:178
      #1 0x8ecb2ca in ExportRedQuantum /home/user/Desktop/ImageMagick/MagickCore/quantum-export.c:2996
      #2 0x8ecb2ca in ExportQuantumPixels /home/user/Desktop/ImageMagick/MagickCore/quantum-export.c:4045
      #3 0x859fec0 in WriteMATImage /home/user/Desktop/ImageMagick/coders/mat.c:1278
      #4 0x8a9e9d8 in WriteImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:1091
      #5 0x8aa23bc in WriteImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:1309
      #6 0x9371daf in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4697
      #7 0x9379bc1 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
      #8 0x91080c3 in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:526
      #9 0x910a545 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
      #10 0x910ea29 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
      #11 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
      #12 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
      #13 0xb7512a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #14 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

  0xb4e029e1 is located 0 bytes to the right of 353-byte region [0xb4e02880,0xb4e029e1)
  allocated by thread T0 here:
      #0 0x80c6b81 in malloc (/usr/local/bin/magick+0x80c6b81)
      #1 0x8193319 in AcquireMagickMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:475
      #2 0x8193319 in AcquireQuantumMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:548

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/ImageMagick/./MagickCore/quantum-private.h:178 PopCharPixel
  Shadow bytes around the buggy address:
    0x369c04e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x369c04f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x369c0500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x369c0510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x369c0520: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x369c0530: 00 00 00 00 00 00 00 00 00 00 00 00[01]fa fa fa
    0x369c0540: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
    0x369c0550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x369c0560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x369c0570: 00 00 00 00 fa fa fa fa fa fa fa fa fa fa fa fa
    0x369c0580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  Shadow byte legend (one shadow byte represents 8 application bytes):
    Addressable:           00
    Partially addressable: 01 02 03 04 05 06 07 
    Heap left redzone:     fa
    Heap right redzone:    fb
    Freed heap region:     fd
    Stack left redzone:    f1
    Stack mid redzone:     f2
    Stack right redzone:   f3
    Stack partial redzone: f4
    Stack after return:    f5
    Stack use after scope: f8
    Global redzone:        f9
    Global init order:     f6
    Poisoned by user:      f7
    ASan internal:         fe
  ==12988==ABORTING

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