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Re: [Gnash-dev] Has gnash been fuzzed?
From: |
Jacek Wielemborek |
Subject: |
Re: [Gnash-dev] Has gnash been fuzzed? |
Date: |
Thu, 19 Nov 2015 19:32:15 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
W dniu 19.11.2015 o 11:25, Sandro Santilli pisze:
> gnash -r2 -
Thanks! I managed to use it with AFL really quickly and already found
one crash:
address@hidden:~/fuzz-results/gnash# ~/bin/cwdump crashwalk.db
(1 of 9) - Hash:
42cf699aa3c84af55b5fa038a3b84dce.42cf699aa3c84af55b5fa038a3b84dce
---CRASH SUMMARY---
Filename: o/master/crashes/id:000006,sig:06,src:000009,op:havoc,rep:8
SHA1: 8d91c84e3729bbf2df58f8ea426e78a6f7247804
Classification: EXPLOITABLE
Hash: 42cf699aa3c84af55b5fa038a3b84dce.42cf699aa3c84af55b5fa038a3b84dce
Command: gtk-gnash -r 2 -
Faulting Frame:
gnash::SWFMovieDefinition::read_all_swf @ 0x00007ffff7a4c4b7: in
/usr/lib/gnash/libgnashcore-0.8.11.so
Disassembly:
Stack Head (8 entries):
raise @ 0x00007ffff3bcf107: in
/lib/x86_64-linux-gnu/libc-2.19.so (BL)
abort @ 0x00007ffff3bd04e8: in
/lib/x86_64-linux-gnu/libc-2.19.so (BL)
None @ 0x00007ffff3bc8226: in
/lib/x86_64-linux-gnu/libc-2.19.so (BL)
__assert_fail @ 0x00007ffff3bc82d2: in
/lib/x86_64-linux-gnu/libc-2.19.so (BL)
gnash::SWFMovieDefinition @ 0x00007ffff7a4c4b7: in
/usr/lib/gnash/libgnashcore-0.8.11.so
None @ 0x00007ffff442d5c0: in
/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
start_thread @ 0x00007ffff3f4b0a4: in
/lib/x86_64-linux-gnu/libpthread-2.19.so
clone @ 0x00007ffff3c8006d: in
/lib/x86_64-linux-gnu/libc-2.19.so (BL)
Registers:
rax=0x0000000000000000 rbx=0x00007ffff7fec000 rcx=0x00007ffff3bcf107
rdx=0x0000000000000006
rsi=0x000000000000510c rdi=0x000000000000431f rbp=0x00007ffff3cfed08
rsp=0x00007fffdcbfe6b8
r8=0x00007fffd80008b0 r9=0xfefefeff092d6364 r10=0x0000000000000008
r11=0x0000000000000202
r12=0x00007ffff7b5baf9 r13=0x00007ffff7b5bca0 r14=0x00005555559424d0
r15=0x00007fffdcbff700
rip=0x00007ffff3bcf107 efl=0x0000000000000202 cs=0x0000000000000033
ss=0x000000000000002b
ds=0x0000000000000000 es=0x0000000000000000 fs=0x0000000000000000
gs=0x0000000000000000
Extra Data:
Description: Possible stack corruption
Short description: PossibleStackCorruption (7/22)
Explanation: GDB generated an error while unwinding the stack and/or
the stack contained return addresses that were not mapped in the
inferior's process address space and/or the stack pointer is pointing to
a location outside the defa
ult stack region. These conditions likely indicate stack corruption,
which is generally considered exploitable.
---END SUMMARY---
address@hidden:~/fuzz-results/gnash# gtk-gnash -r 2 - <
./o/master/crashes/id:000004*
ALSA lib confmisc.c:768:(parse_card) cannot find card '0'
ALSA lib conf.c:4260:(_snd_config_evaluate) function
snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4260:(_snd_config_evaluate) function snd_func_concat
returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4260:(_snd_config_evaluate) function snd_func_refer
returned error: No such file or directory
ALSA lib conf.c:4739:(snd_config_expand) Evaluate error: No such file or
directory
ALSA lib pcm.c:2267:(snd_pcm_open_noupdate) Unknown PCM default
gtk-gnash: ../../../libcore/parser/SWFMovieDefinition.cpp:450: void
gnash::SWFMovieDefinition::read_all_swf(): Assertion `startPos <=
_swf_end_pos' failed.
Aborted (core dumped)
address@hidden:~/fuzz-results/gnash# base64
./o/master/crashes/id:000004*
RldTCAAAAAAg2t3y+3t5WHVnd+8=
Here's a Docker file that you can use to reproduce the fuzzing:
FROM d33tah/afl-sid
RUN aflize gnash
RUN dpkg -i ~/pkgs/*
RUN apt-get -f install -y
RUN mkdir i
# Note to mailing list: below has to be in one line
RUN echo
'Q1dTCOgwAAB42t06+3tcxXVnd+/ujiTLNopBGK9dUVywKXHMIyU4tixZz41Xd927Akwdul2t7kqLV7vK7l1bDuEZCI+kxkmL8CMGGtq0CSmEQto0bdP3OymtbQxtSELIA1L6F/SHquecmbk7V9qV7H5fv69f9X2enTlz5pwz5zU='
| base64 -d > i/1
# The line above ended before #
ENTRYPOINT afl-fuzz-parallel -i i -o o -m none -- gtk-gnash -r 2 -
To use it, save it as Dockerfile and run:
sudo docker build --no-cache=true -t afl-gnash .
sudo docker run -ti afl-gnash
Let me know if you're having any problems - I'm still working on
afl-sid, so there might be some recent bugs.
Cheers,
d3tah
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Description: OpenPGP digital signature
- [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/18
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/18
- Re: [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/18
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/18
- Re: [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/18
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/19
- Re: [Gnash-dev] Has gnash been fuzzed?,
Jacek Wielemborek <=
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/20
- Re: [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/20
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/20
- Re: [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/20
- Re: [Gnash-dev] Has gnash been fuzzed?, Sandro Santilli, 2015/11/20
- Re: [Gnash-dev] Has gnash been fuzzed?, Jacek Wielemborek, 2015/11/20