Ubuntu
imagemagick package

out-of-bounds write in ./MagickCore/pixel-accessor.h:766

Bug #1539050 reported by Moshe Kaplan on 2016-01-28

256

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	imagemagick (Ubuntu)	Fix Released	Undecided	Unassigned

Bug Description

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on ImageMagick version Tested on git commit 8bc3ab67d818204fe5f0fe1dc29b873d37360461

Command: magick id:000002,sig:06,src:000001,op:flip1,pos:866 /dev/null

=================================================================
==12486==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb3106606 at pc 0x88a4fda bp 0xbfdb0448 sp 0xbfdb0440
WRITE of size 2 at 0xb3106606 thread T0
    #0 0x88a4fd9 in InsertRow /home/user/Desktop/ImageMagick/./MagickCore/pixel-accessor.h:766
    #1 0x888ace3 in UnpackWPGRaster /home/user/Desktop/ImageMagick/coders/wpg.c:486
    #2 0x888ace3 in ReadWPGImage /home/user/Desktop/ImageMagick/coders/wpg.c:1154
    #3 0x8a940ba in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #4 0x8a9bf2f in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #5 0x93716d9 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #6 0x9379bc1 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #7 0x91071cd in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
    #8 0x910a545 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
    #9 0x910ea29 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
    #10 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
    #11 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
    #12 0xb745aa82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #13 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

0xb3106606 is located 6 bytes to the right of 25600-byte region [0xb3100200,0xb3106600)
allocated by thread T0 here:
    #0 0x80c7021 in __interceptor_posix_memalign (/usr/local/bin/magick+0x80c7021)
    #1 0x8192c0f in AcquireAlignedMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:273
    #2 0x89b1f8e in OpenPixelCache /home/user/Desktop/ImageMagick/MagickCore/cache.c:3402
    #3 0x89bee6c in GetImagePixelCache /home/user/Desktop/ImageMagick/MagickCore/cache.c:1583
    #4 0x8982d3d in QueueAuthenticPixelCacheNexus /home/user/Desktop/ImageMagick/MagickCore/cache.c:3800
    #5 0x89c08b9 in QueueAuthenticPixels /home/user/Desktop/ImageMagick/MagickCore/cache.c:3970

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/ImageMagick/./MagickCore/pixel-accessor.h:766 InsertRow
Shadow bytes around the buggy address:
  0x36620c70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36620c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36620c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36620ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x36620cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x36620cc0:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36620cd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36620ce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36620cf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36620d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36620d10: 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
==12486==ABORTING