*** 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:000078,sig:06,src:000122,op:arith8,pos:11,val:+5
/dev/null
=================================================================
==12927==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb3e066a6 at
pc 0x88e176f bp 0xbf870d68 sp 0xbf870d60
WRITE of size 1 at 0xb3e066a6 thread T0
#0 0x88e176e in ReadRLEImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/rle.c:524
#1 0x8244d62 in ReadImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:1607
#2 0x812c3ac in ConvertImageCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:4348
#3 0x8165066 in MagickCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:8862
#4 0x81ed0dc in GMCommandSingle
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17338
#5 0x81ea204 in GMCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17391
#6 0x80d4a76 in main
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm.c:61
#7 0xb74a3a82 in __libc_start_main
/build/buildd/eglibc-2.19/csu/libc-start.c:287
#8 0x80d4904 in _start
(/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm+0x80d4904)
0xb3e066a6 is located 6 bytes to the right of 25760-byte region
[0xb3e00200,0xb3e066a0)
allocated by thread T0 here:
#0 0x80bd531 in __interceptor_malloc
(/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/utilities/gm+0x80bd531)
#1 0x839c9f4 in MagickMalloc
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/memory.c:156
#2 0x839c9f4 in MagickMallocArray
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/memory.c:347
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/rle.c:524
ReadRLEImage
Shadow bytes around the buggy address:
0x367c0c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c0c90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c0ca0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c0cb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c0cc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x367c0cd0: 00 00 00 00[fa]fa fa fa fa fa fa fa fa fa fa fa
0x367c0ce0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c0cf0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c0d00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c0d10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c0d20: 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
==12927==ABORTING
** Affects: graphicsmagick (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1537860
Title:
out-of-bounds write in coders/rle.c:524
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