out-of-bounds read in coders/wpg.c:342:19

[Moshe Kaplan]

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on ImageMagick git commit %s

Command: magick id:000338,sig:06,src:005458,op:havoc,rep:8 /dev/null

=================================================================
==1020==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5e108eb at pc 0x889da35 bp 0xbffa92f8 sp 0xbffa92f0
READ of size 1 at 0xb5e108eb thread T0
    #0 0x889da34 in InsertRow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:342:19
    #1 0x8886e51 in ReadWPGImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:1341
    #2 0x8a8ad6a in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
    #3 0x8a92bdf in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
    #4 0x9375c09 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4685
    #5 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
    #6 0x910ae9d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474
    #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 0xb7525a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #12 0x80ddf94 in _start (/usr/local/bin/magick+0x80ddf94)

0xb5e108eb is located 0 bytes to the right of 27-byte region [0xb5e108d0,0xb5e108eb)
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 0x8a8ad6a in ReadImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:494
    #4 0x8a92bdf in ReadImages /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickCore/constitute.c:844
    #5 0x9375c09 in CLINoImageOperator /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:4685
    #6 0x937e0f1 in CLIOption /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/operation.c:5179
    #7 0x910ae9d in ProcessCommandOptions /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/MagickWand/magick-cli.c:474

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/wpg.c:342 InsertRow
Shadow bytes around the buggy address:
  0x36bc20c0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x36bc20d0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
  0x36bc20e0: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
  0x36bc20f0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x36bc2100: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
=>0x36bc2110: fd fd fa fa fd fd fd fd fa fa 00 00 00[03]fa fa
  0x36bc2120: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x36bc2130: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
  0x36bc2140: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
  0x36bc2150: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x36bc2160: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
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
==1020==ABORTING

[Moshe Kaplan (moshekaplan)]

input file to trigger crash

[Moshe Kaplan (moshekaplan)]

Reported upstream at: https://github.com/ImageMagick/ImageMagick/issues/120

[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