[Bug 1537421] Re: heap-buffer-overflow in coders/sun.c:175

[Moshe Kaplan]

This bug was found while fuzzing ImageMagick with afl-fuzz

Tested on git commit 87b213f9e2578611654a74ea0c6014367f4dc2fa

Command: magick $infile /dev/null

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Title:
  heap-buffer-overflow in coders/sun.c:175

Status in imagemagick package in Ubuntu:
  New

Bug description:
  =================================================================
  ==19729==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb600aecc at pc 0x8801fba bp 0xbfdb50b8 sp 0xbfdb50b0
  READ of size 1 at 0xb600aecc thread T0
      #0 0x8801fb9 in DecodeImage /home/user/Desktop/ImageMagick/coders/sun.c:175
      #1 0x8801fb9 in ReadSUNImage /home/user/Desktop/ImageMagick/coders/sun.c:441
      #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 0xb74b5a82 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
      #12 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)

  0xb600aecc is located 0 bytes to the right of 204-byte region [0xb600ae00,0xb600aecc)
  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/sun.c:175 DecodeImage
  Shadow bytes around the buggy address:
    0x36c01580: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c01590: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c015a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c015b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c015c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  =>0x36c015d0: 00 00 00 00 00 00 00 00 00[04]fa fa fa fa fa fa
    0x36c015e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c015f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c01600: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c01610: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
    0x36c01620: 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
  ==19729==ABORTING

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