[Bug 1542107] Re: out-of-bounds write in coders/pdb.c:691

[Seth Arnold]

** Changed in: imagemagick (Ubuntu)
       Status: New => Confirmed

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Title:
  out-of-bounds write in coders/pdb.c:691

Status in imagemagick package in Ubuntu:
  Confirmed

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

  Tested on ImageMagick git commit %s

  Command: magick id:000102,sig:06,src:000277,op:int16,pos:140,val:+1024
  /dev/null

  =================================================================
  ==31973==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4201d80 at pc 0x866c0e6 bp 0xbfd4db78 sp 0xbfd4db70
  WRITE of size 1 at 0xb4201d80 thread T0
      #0 0x866c0e5 in EncodeRLE /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/pdb.c:691
      #1 0x866c0e5 in WritePDBImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/pdb.c:884
      #2 0x8a95688 in WriteImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:1091
      #3 0x8a9906c in WriteImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:1309
      #4 0x93762df in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4719
      #5 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
      #6 0x910bd93 in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:526
      #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 0xb74d3a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #12 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

  0xb4201d80 is located 0 bytes to the right of 96-byte region [0xb4201d20,0xb4201d80)
  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 0x8a95688 in WriteImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:1091
      #4 0x8a9906c in WriteImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:1309
      #5 0x93762df in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4719
      #6 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
      #7 0x910bd93 in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:526

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/pdb.c:691 EncodeRLE
  Shadow bytes around the buggy address:
    0x36840360: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36840370: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36840380: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36840390: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
    0x368403a0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x368403b0:[fa]fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
    0x368403c0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
    0x368403d0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
    0x368403e0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
    0x368403f0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 fa
    0x36840400: 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
  ==31973==ABORTING

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