ubuntu@ubuntu:~/fuzz_py$ gm convert -version
GraphicsMagick 1.4 snapshot-20171203 Q8
==3510==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000002bf at pc 0x7f3d07e2caf4 bp 0x7ffd7d14a920 sp 0x7ffd7d14a918
WRITE of size 1 at 0x6020000002bf thread T0
#0 0x7f3d07e2caf3 in MagickBitStreamMSBWrite /home/ubuntu/GraphicsMagick/magick/bit_stream.c:125:28
#1 0x7f3d07f765ea in ExportGrayAlphaQuantumType /home/ubuntu/GraphicsMagick/magick/export.c:1252:21
#2 0x7f3d07f765ea in ExportViewPixelArea /home/ubuntu/GraphicsMagick/magick/export.c:3213
#3 0x7f3d082d8e32 in WritePNMImage /home/ubuntu/GraphicsMagick/coders/pnm.c:1930:21
#4 0x7f3d07f0b319 in WriteImage /home/ubuntu/GraphicsMagick/magick/constitute.c:2230:14
#5 0x7f3d07f0baa7 in WriteImages /home/ubuntu/GraphicsMagick/magick/constitute.c:2387:21
#6 0x7f3d07e9dd84 in ConvertImageCommand /home/ubuntu/GraphicsMagick/magick/command.c:6087:11
#7 0x7f3d07ebc0db in MagickCommand /home/ubuntu/GraphicsMagick/magick/command.c:8872:17
#8 0x7f3d07eda495 in GMCommandSingle /home/ubuntu/GraphicsMagick/magick/command.c:17393:10
#9 0x7f3d07ed9585 in GMCommand /home/ubuntu/GraphicsMagick/magick/command.c:17446:16
#10 0x7f3d05c11f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287
#11 0x41980b in _start (/usr/local/bin/gm+0x41980b)
0x6020000002bf is located 0 bytes to the right of 15-byte region [0x6020000002b0,0x6020000002bf)
allocated by thread T0 here:
#0 0x4b91d3 in malloc (/usr/local/bin/gm+0x4b91d3)
#1 0x7f3d082d7d4a in WritePNMImage /home/ubuntu/GraphicsMagick/coders/pnm.c:1868:20
#2 0x7f3d07f0b319 in WriteImage /home/ubuntu/GraphicsMagick/magick/constitute.c:2230:14
#3 0x7f3d07f0baa7 in WriteImages /home/ubuntu/GraphicsMagick/magick/constitute.c:2387:21
#4 0x7f3d07e9dd84 in ConvertImageCommand /home/ubuntu/GraphicsMagick/magick/command.c:6087:11
#5 0x7f3d07ebc0db in MagickCommand /home/ubuntu/GraphicsMagick/magick/command.c:8872:17
#6 0x7f3d07eda495 in GMCommandSingle /home/ubuntu/GraphicsMagick/magick/command.c:17393:10
#7 0x7f3d07ed9585 in GMCommand /home/ubuntu/GraphicsMagick/magick/command.c:17446:16
#8 0x7f3d05c11f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287
SUMMARY: AddressSanitizer: heap-buffer-overflow /home/ubuntu/GraphicsMagick/magick/bit_stream.c:125:28 in MagickBitStreamMSBWrite
Shadow bytes around the buggy address:
0x0c047fff8000: fa fa fd fa fa fa 00 04 fa fa 00 04 fa fa 00 04
0x0c047fff8010: fa fa 00 04 fa fa 00 04 fa fa 00 04 fa fa 00 04
0x0c047fff8020: fa fa 00 04 fa fa 00 04 fa fa 00 04 fa fa 00 04
0x0c047fff8030: fa fa fd fd fa fa 00 04 fa fa fd fd fa fa fd fa
0x0c047fff8040: fa fa fd fa fa fa 00 fa fa fa 00 fa fa fa 06 fa
=>0x0c047fff8050: fa fa 00 fa fa fa 00[07]fa fa fa fa fa fa fa fa
0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8080: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff80a0: 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
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
==3510==ABORTING
credit: littleputa of nsfocus security team.
Please re-attach your "pam.png" in a zip archive. I am not able to reproduce the problem with the current file. FYI, SourceForge rewrites common formats like GIF and PNG so they will be destroyed as test-cases unless they are wrapped up.
The attachments dosn't work,please see https://github.com/littleputa/poc/files/1534075/pam.zip.
The file extracted from your zip file does reproduce the problem.
Diff:
This problem is fixed by Mercurial changeset 15290:f1c418ef0260. Thanks for reporting this issue.
CVE-2017-17498 credit: littleputa of nsfocus security team.
Last edit: littleputa 2018-07-04