out-of-bounds write in MagickCore/memory.c:711

[Moshe Kaplan]

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on ImageMagick git commit %s

Command: magick id:000203,sig:06,src:001740,op:havoc,rep:4 /dev/null

=================================================================
==417==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4101e80 at pc 0x818c2ab bp 0xbf96e128 sp 0xbf96e120
WRITE of size 1 at 0xb4101e80 thread T0
    #0 0x818c2aa in CopyMagickMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:711
    #1 0x8669895 in EncodeRLE /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/pdb.c:692
    #2 0x8669895 in WritePDBImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/pdb.c:884
    #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
    #8 0x910e215 in MagickImageCommand /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:786
    #9 0x91126f9 in MagickCommandGenesis /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/mogrify.c:172
    #10 0x80de16d in MagickMain /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:74
    #11 0x80de16d in main /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/utilities/magick.c:85
    #12 0xb7455a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #13 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

0xb4101e80 is located 0 bytes to the right of 96-byte region [0xb4101e20,0xb4101e80)
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/MagickCore/memory.c:711 CopyMagickMemory
Shadow bytes around the buggy address:
  0x36820380: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36820390: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x368203a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x368203b0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
  0x368203c0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00
=>0x368203d0:[fa]fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x368203e0: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x368203f0: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 fa
  0x36820400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36820410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36820420: 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
==417==ABORTING

[Moshe Kaplan (moshekaplan)]

input file to trigger crash

[Moshe Kaplan (moshekaplan)]

Reported upstream at: https://github.com/ImageMagick/ImageMagick/issues/119