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

[Moshe Kaplan]

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

[Moshe Kaplan (moshekaplan)]

input file to trigger crash

[Moshe Kaplan (moshekaplan)]

Reported upstream at https://github.com/ImageMagick/ImageMagick/issues/126

[Launchpad Janitor (janitor)]

This bug was fixed in the package imagemagick - 8:6.9.6.6+dfsg-1ubuntu3

---------------
imagemagick (8:6.9.6.6+dfsg-1ubuntu3) zesty; urgency=medium

  * debian/patches/0020-Revert-GradientImage-change.patch: Revert patch
    per https://github.com/ImageMagick/ImageMagick/issues/316. Thanks
    to Cristy <email address hidden>. Closes LP: #1645406.

 -- Nishanth Aravamudan <email address hidden> Tue, 06 Dec 2016 17:26:36 +0100