[Bug 1542785] [NEW] out-of-bounds write in ./MagickCore/pixel-accessor.h:839

Moshe Kaplan mk.moshe.kaplan at gmail.com
Sun Feb 7 05:50:29 UTC 2016 

*** This bug is a security vulnerability ***

Public security bug reported:

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on ImageMagick git commit
5572ef67a81385837decff3746026b9abfd4a599


Command: magick id:000351,sig:06,src:005875,op:havoc,rep:128 /dev/null

=================================================================
==21278==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5404cc0 at pc 0x8fc9cf8 bp 0xbfd29cd8 sp 0xbfd29cd0
WRITE of size 2 at 0xb5404cc0 thread T0
    #0 0x8fc9cf7 in ImportCbYCrYQuantum /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/./MagickCore/pixel-accessor.h:839
    #1 0x8fc9cf7 in ImportQuantumPixels /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/quantum-import.c:4183
    #2 0x84b5417 in ReadDPXImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/dpx.c:1266
    #3 0x8a8b0fa in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
    #4 0x8a92f6f in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
    #5 0x9375259 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4680
    #6 0x937d741 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5174
    #7 0x910a89d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474
    #8 0x910dc15 in MagickImageCommand /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:786
    #9 0x91120f9 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 0xb74f9a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #13 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

0xb5404cc0 is located 0 bytes to the right of 4032-byte region [0xb5403d00,0xb5404cc0)
allocated by thread T0 here:
    #0 0x80c7061 in __interceptor_posix_memalign (/usr/local/bin/magick+0x80c7061)
    #1 0x81881bf in AcquireAlignedMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:273
    #2 0x89a8e5e in OpenPixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:3402
    #3 0x89b5d3f in GetImagePixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:1583
    #4 0x89c2c29 in SyncImagePixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:5023

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/./MagickCore/pixel-accessor.h:839 ImportCbYCrYQuantum
Shadow bytes around the buggy address:
  0x36a80940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36a80950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36a80960: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36a80970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36a80980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x36a80990: 00 00 00 00 00 00 00 00[fa]fa fa fa fa fa fa fa
  0x36a809a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36a809b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36a809c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36a809d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36a809e0: 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
==21278==ABORTING

** Affects: imagemagick (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1542785

Title:
  out-of-bounds write in ./MagickCore/pixel-accessor.h:839

Status in imagemagick package in Ubuntu:
  New

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

  Tested on ImageMagick git commit
  5572ef67a81385837decff3746026b9abfd4a599

  
  Command: magick id:000351,sig:06,src:005875,op:havoc,rep:128 /dev/null

  =================================================================
  ==21278==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5404cc0 at pc 0x8fc9cf8 bp 0xbfd29cd8 sp 0xbfd29cd0
  WRITE of size 2 at 0xb5404cc0 thread T0
      #0 0x8fc9cf7 in ImportCbYCrYQuantum /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/./MagickCore/pixel-accessor.h:839
      #1 0x8fc9cf7 in ImportQuantumPixels /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/quantum-import.c:4183
      #2 0x84b5417 in ReadDPXImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/dpx.c:1266
      #3 0x8a8b0fa in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
      #4 0x8a92f6f in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
      #5 0x9375259 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4680
      #6 0x937d741 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5174
      #7 0x910a89d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474
      #8 0x910dc15 in MagickImageCommand /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:786
      #9 0x91120f9 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 0xb74f9a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #13 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

  0xb5404cc0 is located 0 bytes to the right of 4032-byte region [0xb5403d00,0xb5404cc0)
  allocated by thread T0 here:
      #0 0x80c7061 in __interceptor_posix_memalign (/usr/local/bin/magick+0x80c7061)
      #1 0x81881bf in AcquireAlignedMemory /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/memory.c:273
      #2 0x89a8e5e in OpenPixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:3402
      #3 0x89b5d3f in GetImagePixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:1583
      #4 0x89c2c29 in SyncImagePixelCache /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/cache.c:5023

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/./MagickCore/pixel-accessor.h:839 ImportCbYCrYQuantum
  Shadow bytes around the buggy address:
    0x36a80940: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36a80950: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36a80960: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36a80970: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    0x36a80980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x36a80990: 00 00 00 00 00 00 00 00[fa]fa fa fa fa fa fa fa
    0x36a809a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36a809b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36a809c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36a809d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36a809e0: 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
  ==21278==ABORTING

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