*** This bug is a security vulnerability ***
Public security bug reported:
This bug was found while fuzzing graphicsmagick with afl-fuzz
Tested on hg changeset 14720:3b1f1e0c1098
Command: gm convert %s /dev/null
=================================================================
==15344==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4a00b05 at
pc 0x89c00b1 bp 0xbfbdc838 sp 0xbfbdc830
READ of size 1 at 0xb4a00b05 thread T0
#0 0x89c00b0 in load_tile
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:373
#1 0x89c00b0 in load_level
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:810
#2 0x89c00b0 in load_hierarchy
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:977
#3 0x89c00b0 in ReadOneLayer
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:1137
#4 0x89c00b0 in ReadXCFImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:1589
#5 0x8244d62 in ReadImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:1607
#6 0x812c3ac in ConvertImageCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:4348
#7 0x8165066 in MagickCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:8862
#8 0x81ed0dc in GMCommandSingle
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17338
#9 0x81ea204 in GMCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17391
#10 0x80d4a76 in main
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm.c:61
#11 0xb74c5a82 in __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:287
#12 0x80d4904 in _start
(/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm+0x80d4904)
0xb4a00b05 is located 0 bytes to the right of 21-byte region
[0xb4a00af0,0xb4a00b05)
allocated by thread T0 here:
#0 0x80bd531 in __interceptor_malloc
(/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm+0x80bd531)
#1 0x839bb38 in MagickMalloc
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/memory.c:156
#2 0x8244d62 in ReadImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:1607
#3 0x812c3ac in ConvertImageCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:4348
#4 0x8165066 in MagickCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:8862
#5 0x81ed0dc in GMCommandSingle
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17338
#6 0x81ea204 in GMCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17391
#7 0x80d4a76 in main
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm.c:61
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xcf.c:373
load_tile
Shadow bytes around the buggy address:
0x36940110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36940120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36940130: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36940140: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36940150: fa fa fa fa fa fa fa fa fa fa fa fa fa fa 00 00
=>0x36940160:[05]fa fa fa fd fd fd fa fa fa fd fd fd fa fa fa
0x36940170: fd fd fd fa fa fa fd fd fd fa fa fa 00 00 00 06
0x36940180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x36940190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369401a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369401b0: 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
==15344==ABORTING
** Affects: graphicsmagick (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1537599
Title:
heap-buffer-overflow in coders/xcf.c:373
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