*** 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
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