[Bug 1539052] [NEW] out-of-bounds read in coders/xcf.c:369:35

Moshe Kaplan mk.moshe.kaplan at gmail.com
Thu Jan 28 12:25:02 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 version Tested on git commit
8bc3ab67d818204fe5f0fe1dc29b873d37360461

Command: magick id:000036,sig:06,src:000016,op:flip2,pos:25 /dev/null

=================================================================
==12630==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5a03a00 at pc 0x88c37a6 bp 0xbf977fb8 sp 0xbf977fb0
READ of size 1 at 0xb5a03a00 thread T0
    #0 0x88c37a5 in load_tile /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:369:35
    #1 0x88c37a5 in load_level /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:656
    #2 0x88c37a5 in load_hierarchy /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:741
    #3 0x88c37a5 in ReadOneLayer /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:918
    #4 0x88c37a5 in ReadXCFImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:1310
    #5 0x8a940ba in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
    #6 0x8a9bf2f in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
    #7 0x93716d9 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
    #8 0x9379bc1 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
    #9 0x91071cd in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
    #10 0x910a545 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
    #11 0x910ea29 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
    #12 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
    #13 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
    #14 0xb74e0a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #15 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

0xb5a03a00 is located 0 bytes to the right of 48-byte region [0xb5a039d0,0xb5a03a00)
allocated by thread T0 here:
    #0 0x80c6b81 in malloc (/usr/local/bin/magick+0x80c6b81)
    #1 0x8193319 in AcquireMagickMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:475
    #2 0x8193319 in AcquireQuantumMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:548
    #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

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:369 load_tile
Shadow bytes around the buggy address:
  0x36b406f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b40700: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b40710: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b40720: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x36b40730: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
=>0x36b40740:[fa]fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 04
  0x36b40750: fa fa 00 00 00 00 00 04 fa fa 00 00 00 00 00 04
  0x36b40760: fa fa 00 00 00 00 00 04 fa fa fd fd fd fd fd fd
  0x36b40770: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 04
  0x36b40780: fa fa 00 00 00 00 00 04 fa fa fd fd fd fd fd fd
  0x36b40790: fa fa fd fd fd fd fd fd fa fa 00 00 00 00 00 04
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
==12630==ABORTING

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

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https://bugs.launchpad.net/bugs/1539052

Title:
  out-of-bounds read in coders/xcf.c:369:35

Status in imagemagick package in Ubuntu:
  New

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

  Tested on ImageMagick version Tested on git commit
  8bc3ab67d818204fe5f0fe1dc29b873d37360461

  Command: magick id:000036,sig:06,src:000016,op:flip2,pos:25 /dev/null

  =================================================================
  ==12630==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb5a03a00 at pc 0x88c37a6 bp 0xbf977fb8 sp 0xbf977fb0
  READ of size 1 at 0xb5a03a00 thread T0
      #0 0x88c37a5 in load_tile /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:369:35
      #1 0x88c37a5 in load_level /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:656
      #2 0x88c37a5 in load_hierarchy /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:741
      #3 0x88c37a5 in ReadOneLayer /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:918
      #4 0x88c37a5 in ReadXCFImage /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:1310
      #5 0x8a940ba in ReadImage /home/user/Desktop/ImageMagick/MagickCore/constitute.c:494
      #6 0x8a9bf2f in ReadImages /home/user/Desktop/ImageMagick/MagickCore/constitute.c:844
      #7 0x93716d9 in CLINoImageOperator /home/user/Desktop/ImageMagick/MagickWand/operation.c:4663
      #8 0x9379bc1 in CLIOption /home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
      #9 0x91071cd in ProcessCommandOptions /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:474
      #10 0x910a545 in MagickImageCommand /home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
      #11 0x910ea29 in MagickCommandGenesis /home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
      #12 0x80de12d in MagickMain /home/user/Desktop/ImageMagick/utilities/magick.c:74
      #13 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
      #14 0xb74e0a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #15 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

  0xb5a03a00 is located 0 bytes to the right of 48-byte region [0xb5a039d0,0xb5a03a00)
  allocated by thread T0 here:
      #0 0x80c6b81 in malloc (/usr/local/bin/magick+0x80c6b81)
      #1 0x8193319 in AcquireMagickMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:475
      #2 0x8193319 in AcquireQuantumMemory /home/user/Desktop/ImageMagick/MagickCore/memory.c:548
      #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

  SUMMARY: AddressSanitizer: heap-buffer-overflow /home/user/Desktop/imagemagick_fuzz_results/ImageMagick/coders/xcf.c:369 load_tile
  Shadow bytes around the buggy address:
    0x36b406f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36b40700: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36b40710: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36b40720: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36b40730: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
  =>0x36b40740:[fa]fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 04
    0x36b40750: fa fa 00 00 00 00 00 04 fa fa 00 00 00 00 00 04
    0x36b40760: fa fa 00 00 00 00 00 04 fa fa fd fd fd fd fd fd
    0x36b40770: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 04
    0x36b40780: fa fa 00 00 00 00 00 04 fa fa fd fd fd fd fd fd
    0x36b40790: fa fa fd fd fd fd fd fd fa fa 00 00 00 00 00 04
  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
  ==12630==ABORTING

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