*** 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:000081,sig:06,src:000075,op:havoc,rep:16 /dev/null
=================================================================
==12988==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4e029e1 at
pc 0x8ecb2cb bp 0xbfa600b8 sp 0xbfa600b0
WRITE of size 1 at 0xb4e029e1 thread T0
#0 0x8ecb2ca in PopCharPixel
/home/user/Desktop/ImageMagick/./MagickCore/quantum-private.h:178
#1 0x8ecb2ca in ExportRedQuantum
/home/user/Desktop/ImageMagick/MagickCore/quantum-export.c:2996
#2 0x8ecb2ca in ExportQuantumPixels
/home/user/Desktop/ImageMagick/MagickCore/quantum-export.c:4045
#3 0x859fec0 in WriteMATImage
/home/user/Desktop/ImageMagick/coders/mat.c:1278
#4 0x8a9e9d8 in WriteImage
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:1091
#5 0x8aa23bc in WriteImages
/home/user/Desktop/ImageMagick/MagickCore/constitute.c:1309
#6 0x9371daf in CLINoImageOperator
/home/user/Desktop/ImageMagick/MagickWand/operation.c:4697
#7 0x9379bc1 in CLIOption
/home/user/Desktop/ImageMagick/MagickWand/operation.c:5157
#8 0x91080c3 in ProcessCommandOptions
/home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:526
#9 0x910a545 in MagickImageCommand
/home/user/Desktop/ImageMagick/MagickWand/magick-cli.c:786
#10 0x910ea29 in MagickCommandGenesis
/home/user/Desktop/ImageMagick/MagickWand/mogrify.c:172
#11 0x80de12d in MagickMain
/home/user/Desktop/ImageMagick/utilities/magick.c:74
#12 0x80de12d in main /home/user/Desktop/ImageMagick/utilities/magick.c:85
#13 0xb7512a82 in __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:287
#14 0x80ddf54 in _start (/usr/local/bin/magick+0x80ddf54)
0xb4e029e1 is located 0 bytes to the right of 353-byte region
[0xb4e02880,0xb4e029e1)
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
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/user/Desktop/ImageMagick/./MagickCore/quantum-private.h:178 PopCharPixel
Shadow bytes around the buggy address:
0x369c04e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c04f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0500: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x369c0520: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x369c0530: 00 00 00 00 00 00 00 00 00 00 00 00[01]fa fa fa
0x369c0540: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x369c0550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x369c0560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x369c0570: 00 00 00 00 fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0580: fd fd fd fd fd fd fd fd fd fd fd fd fd fd 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
==12988==ABORTING
** Affects: imagemagick (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1539053
Title:
out-of-bounds write in ./MagickCore/quantum-private.h:178
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