[Bug 1542115] Re: out-of-bounds read in MagickCore/memory.c:707:23

[Moshe Kaplan]

Reported upstream at:
https://github.com/ImageMagick/ImageMagick/issues/122

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Title:
  out-of-bounds read in MagickCore/memory.c:707:23

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:000346,sig:06,src:005762,op:havoc,rep:32 /dev/null

  =================================================================
  ==1064==ERROR: AddressSanitizer: global-buffer-overflow on address 0x0950b2e4 at pc 0x80b2b26 bp 0xbfcdd908 sp 0xbfcdd4ec
  READ of size 4096 at 0x0950b2e4 thread T0
      #0 0x80b2b25 in memcpy (/usr/local/bin/magick+0x80b2b25)
      #1 0x818b8fd in CopyMagickMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:707:23
      #2 0x888dfb8 in ExtractPostscript /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:787
      #3 0x887f751 in ReadWPGImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:1077
      #4 0x8a8ad6a in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
      #5 0x8a92bdf in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
      #6 0x9375c09 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4685
      #7 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
      #8 0x910ae9d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474
      #9 0x910e215 in MagickImageCommand /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:786
      #10 0x91126f9 in MagickCommandGenesis /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/mogrify.c:172
      #11 0x80de16d in MagickMain /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:74
      #12 0x80de16d in main /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:85
      #13 0xb74c5a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #14 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

  0x0950b2e4 is located 60 bytes to the left of global variable '.str185' from 'MagickCore/magic.c' (0x950b320) of size 6
  0x0950b2e4 is located 0 bytes to the right of global variable '.str184' from 'MagickCore/magic.c' (0x950b2e0) of size 4
    '.str184' is ascii string 'TTF'
  SUMMARY: AddressSanitizer: global-buffer-overflow ??:0 memcpy
  Shadow bytes around the buggy address:
    0x212a1600: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9
    0x212a1610: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9
    0x212a1620: f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9
    0x212a1630: f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9
    0x212a1640: f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9 00 01 f9 f9
  =>0x212a1650: f9 f9 f9 f9 00 01 f9 f9 f9 f9 f9 f9[04]f9 f9 f9
    0x212a1660: f9 f9 f9 f9 06 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9
    0x212a1670: f9 f9 f9 f9 00 00 00 00 01 f9 f9 f9 f9 f9 f9 f9
    0x212a1680: 06 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
    0x212a1690: 07 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9
    0x212a16a0: 03 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9
  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
  ==1064==ABORTING

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