*** 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 id:000075,sig:06,src:000107,op:flip1,pos:7 /dev/null
=================================================================
==7295==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb4e03bdc at
pc 0x891bd19 bp 0xbfb26208 sp 0xbfb26200
WRITE of size 1 at 0xb4e03bdc thread T0
#0 0x891bd18 in WriteSUNImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/sun.c:962
#1 0x824e050 in WriteImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:2208
#2 0x824fb98 in WriteImages
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:2351
#3 0x8144026 in ConvertImageCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:6087
#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
#8 0xb74dca82 in __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:287
#9 0x80d4904 in _start
(/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm+0x80d4904)
0xb4e03bdc is located 0 bytes to the right of 284-byte region
[0xb4e03ac0,0xb4e03bdc)
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 0x824e050 in WriteImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:2208
#3 0x824fb98 in WriteImages
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:2351
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/sun.c:962
WriteSUNImage
Shadow bytes around the buggy address:
0x369c0720: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0730: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0740: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x369c0750: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x369c0760: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x369c0770: 00 00 00 00 00 00 00 00 00 00 00[04]fa fa fa fa
0x369c0780: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x369c0790: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x369c07a0: fd fd fd fd fd fd fd fd fd fd fd fd fa fa fa fa
0x369c07b0: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x369c07c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
==7295==ABORTING
** Affects: graphicsmagick (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1537835
Title:
out-of-bounds write in coders/sun.c:962
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