out-of-bounds read in coders/meta.c:496

[Moshe Kaplan]

=================================================================
==19714==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb2f02be0 at pc 0x85b330e bp 0xbfa4eb88 sp 0xbfa4eb80
READ of size 1 at 0xb2f02be0 thread T0
    #0 0x85b330d in parse8BIM /home/user/Desktop/ImageMagick/coders/meta.c:496
    #1 0x85b330d in ReadMETAImage /home/user/Desktop/ImageMagick/coders/meta.c:1201
    #2 0x8a9438a in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #3 0x8a9c1ff in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #4 0x9371649 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #5 0x9379b31 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #6 0x910713d in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
    #7 0x910a4b5 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
    #8 0x910e999 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
    #9 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
    #10 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
    #11 0xb74a7a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #12 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

0xb2f02be0 is located 0 bytes to the right of 144-byte region [0xb2f02b50,0xb2f02be0)
allocated by thread T0 here:
    #0 0x80c6b81 in malloc (/usr/local/bin/magick+0x80c6b81)
    #1 0x81932f9 in AcquireMagickMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:475
    #2 0x81932f9 in AcquireQuantumMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:548
    #3 0x8a9438a in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #4 0x8a9c1ff in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #5 0x9371649 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #6 0x9379b31 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #7 0x910713d in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/ImageMagick/coders/meta.c:496 parse8BIM
Shadow bytes around the buggy address:
  0x365e0520: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x365e0530: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x365e0540: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x365e0550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x365e0560: 00 00 fa fa fa fa fa fa fa fa 00 00 00 00 00 00
=>0x365e0570: 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa fa
  0x365e0580: fa fa fa fa fd fd fd fd fd fd fd fd fd fd fd fd
  0x365e0590: fd fd fd fd fd fd fa fa fa fa fa fa fa fa fd fd
  0x365e05a0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x365e05b0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x365e05c0: fd fd fd fd fd fd fd fd fd fd 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
==19714==ABORTING

[Moshe Kaplan (moshekaplan)]

input file to trigger crash

[Moshe Kaplan (moshekaplan)]

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on git commit 87b213f9e2578611654a74ea0c6014367f4dc2fa

Command: magick $infile /dev/null

[Moshe Kaplan (moshekaplan)]

Reported and fixed upstream at: https://github.com/ImageMagick/ImageMagick/issues/94

[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