[Bug 1542114] Re: out-of-bounds read in coders/wpg.c:342:19

[Moshe Kaplan]

Reported upstream at:
https://github.com/ImageMagick/ImageMagick/issues/120

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Title:
  out-of-bounds read in coders/wpg.c:342:19

Status in imagemagick package in Ubuntu:
  New

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

  Tested on ImageMagick git commit %s

  Command: magick id:000338,sig:06,src:005458,op:havoc,rep:8 /dev/null

  =================================================================
  ==1020==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5e108eb at pc 0x889da35 bp 0xbffa92f8 sp 0xbffa92f0
  READ of size 1 at 0xb5e108eb thread T0
      #0 0x889da34 in InsertRow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:342:19
      #1 0x8886e51 in ReadWPGImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:1341
      #2 0x8a8ad6a in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
      #3 0x8a92bdf in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
      #4 0x9375c09 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4685
      #5 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
      #6 0x910ae9d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474
      #7 0x910e215 in MagickImageCommand /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:786
      #8 0x91126f9 in MagickCommandGenesis /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/mogrify.c:172
      #9 0x80de16d in MagickMain /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:74
      #10 0x80de16d in main /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:85
      #11 0xb7525a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #12 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

  0xb5e108eb is located 0 bytes to the right of 27-byte region [0xb5e108d0,0xb5e108eb)
  allocated by thread T0 here:
      #0 0x80c6bc1 in malloc (/usr/local/bin/magick+0x80c6bc1)
      #1 0x81889a9 in AcquireMagickMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:475
      #2 0x81889a9 in AcquireQuantumMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:548
      #3 0x8a8ad6a in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
      #4 0x8a92bdf in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
      #5 0x9375c09 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4685
      #6 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
      #7 0x910ae9d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:342 InsertRow
  Shadow bytes around the buggy address:
    0x36bc20c0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
    0x36bc20d0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
    0x36bc20e0: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
    0x36bc20f0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
    0x36bc2100: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
  =>0x36bc2110: fd fd fa fa fd fd fd fd fa fa 00 00 00[03]fa fa
    0x36bc2120: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
    0x36bc2130: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
    0x36bc2140: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
    0x36bc2150: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
    0x36bc2160: fa fa fd fd fd fd fa fa fd fd fd fd fa fa 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
  ==1020==ABORTING

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