*** 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
=================================================================
==23869==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xb3e1f47f at
pc 0x89c96a3 bp 0xbf81a128 sp 0xbf81a120
READ of size 1 at 0xb3e1f47f thread T0
#0 0x89c96a2 in ParseColor
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xpm.c:154
#1 0x89c96a2 in ReadXPMImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xpm.c:347
#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
#8 0xb7505a82 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)
0xb3e1f47f is located 1 bytes to the left of 2065-byte region
[0xb3e1f480,0xb3e1fc91)
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 0x89c518e in ReadXPMImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/coders/xpm.c:306
#3 0x8244d62 in ReadImage
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/constitute.c:1607
#4 0x812c3ac in ConvertImageCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:4348
#5 0x8165066 in MagickCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:8862
#6 0x81ed0dc in GMCommandSingle
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17338
#7 0x81ea204 in GMCommand
/home/user/Desktop/graphicsmagick_fuzz_results/graphicsmagick/magick/command.c:17391
#8 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/xpm.c:154
ParseColor
Shadow bytes around the buggy address:
0x367c3e30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3e50: 00 00 01 fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c3e60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x367c3e70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x367c3e80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
0x367c3e90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3ea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3eb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3ec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x367c3ed0: 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
==23869==ABORTING
** Affects: graphicsmagick (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1537601
Title:
heap-buffer-overflow in coders/xpm.c:154
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