[Bug 1539050] Re: out-of-bounds write in ./MagickCore/pixel-accessor.h:766

[Moshe Kaplan]

Reported upstream at:
https://github.com/ImageMagick/ImageMagick/issues/102

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Title:
  out-of-bounds write in ./MagickCore/pixel-accessor.h:766

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:000002,sig:06,src:000001,op:flip1,pos:866 /dev/null

  =================================================================
  ==12486==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb3106606 at pc 0x88a4fda bp 0xbfdb0448 sp 0xbfdb0440
  WRITE of size 2 at 0xb3106606 thread T0
      #0 0x88a4fd9 in InsertRow /home/user/Desktop/ImageMagick/./MagickCore/pixel-accessor.h:766
      #1 0x888ace3 in UnpackWPGRaster /home/user/Desktop/ImageMagick/coders/wpg.c:486
      #2 0x888ace3 in ReadWPGImage /home/user/Desktop/ImageMagick/coders/wpg.c:1154
      #3 0x8a940ba in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
      #4 0x8a9bf2f in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
      #5 0x93716d9 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
      #6 0x9379bc1 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
      #7 0x91071cd in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
      #8 0x910a545 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
      #9 0x910ea29 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
      #10 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
      #11 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
      #12 0xb745aa82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #13 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

  0xb3106606 is located 6 bytes to the right of 25600-byte region [0xb3100200,0xb3106600)
  allocated by thread T0 here:
      #0 0x80c7021 in __interceptor_posix_memalign (/usr/local/bin/magick+0x80c7021)
      #1 0x8192c0f in AcquireAlignedMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:273
      #2 0x89b1f8e in OpenPixelCache /home/user/Desktop/ImageMagick/MagickCore/cache.c:3402
      #3 0x89bee6c in GetImagePixelCache /home/user/Desktop/ImageMagick/MagickCore/cache.c:1583
      #4 0x8982d3d in QueueAuthenticPixelCacheNexus /home/user/Desktop/ImageMagick/MagickCore/cache.c:3800
      #5 0x89c08b9 in QueueAuthenticPixels /home/user/Desktop/ImageMagick/MagickCore/cache.c:3970

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/ImageMagick/./MagickCore/pixel-accessor.h:766 InsertRow
  Shadow bytes around the buggy address:
    0x36620c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36620c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36620c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36620ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36620cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x36620cc0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36620cd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36620ce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36620cf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36620d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36620d10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  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
  ==12486==ABORTING

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