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Date: Wed, 1 Jul 2015 10:04:32 +0800
From: Kai Zhao <loverszhao@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: more robustness
> Is there an easy way to reproduce this problem for a bleeding-jumbo
> version without the --fuzz option?
Sorry I did not consider the reproduce. I think I should do something
for others to reproduce the bugs.
Currently, when I found bugs, I will output all the mutated hashes of the
format and try to reproduce. It's a bad way.
I will try to add this feature. I think it would be easy to support it in
fuzz_option.pl. Alexander Cherepanov's fuzzer.sh has done the work
that minimize samples for failed format. I think I can borrow from the
script.
Thanks,
Kai
On Mon, Jun 29, 2015 at 12:31 AM, Frank Dittrich <frank.dittrich@...lbox.org
> wrote:
> On 06/28/2015 01:54 PM, Kai Zhao wrote:
> >> I think more people might try out and comment on your new --fuzz option
> >> if you would push your changes to (a separate branch of) your own github
> >> repository and provide a link to that repository/branch.
> >
> > Thanks, here is the link:
> >
> > https://github.com/loverszhaokai/JohnTheRipper/tree/fuzz_option
>
> (fuzz_option)run $ ./john --format=PBKDF2-HMAC-SHA1 --fuzz
> Fuzzing: PBKDF2-HMAC-SHA1 [PBKDF2-SHA1 128/128 AVX 4x]...
> =================================================================
> ==26467==ERROR: AddressSanitizer: stack-buffer-overflow on address
> 0x7ffd6af53f3a at pc 0x00000044f633 bp 0x7ffd6af53bc0 sp 0x7ffd6af53bb0
> WRITE of size 1 at 0x7ffd6af53f3a thread T0
> #0 0x44f632 in raw_to_hex
> /home/fd/git/fuzz-JtR/src/base64_convert.c:241
> #1 0x453afd in mime_to_hex
> /home/fd/git/fuzz-JtR/src/base64_convert.c:686
> #2 0x45611b in base64_convert
> /home/fd/git/fuzz-JtR/src/base64_convert.c:921
> #3 0x60f77d in prepare
> /home/fd/git/fuzz-JtR/src/pbkdf2-hmac-sha1_fmt_plug.c:151
> #4 0x6bd370 in fuzz_test /home/fd/git/fuzz-JtR/src/formats.c:1153
> #5 0x6a4d2e in fuzz /home/fd/git/fuzz-JtR/src/bench.c:829
> #6 0x6c995d in john_run /home/fd/git/fuzz-JtR/src/john.c:1367
> #7 0x6cae5c in main /home/fd/git/fuzz-JtR/src/john.c:1753
> #8 0x7f83fc8b078f in __libc_start_main (/lib64/libc.so.6+0x2078f)
> #9 0x406878 in _start (/home/fd/git/fuzz-JtR/run/john+0x406878)
>
> Address 0x7ffd6af53f3a is located in stack of thread T0 at offset 106 in
> frame
> #0 0x60f49e in prepare
> /home/fd/git/fuzz-JtR/src/pbkdf2-hmac-sha1_fmt_plug.c:118
>
> This frame has 3 object(s):
> [32, 106) 'tmph' <== Memory access at offset 106 overflows this
> variable
> [160, 284) 'tmp'
> [320, 464) 'tmps'
> HINT: this may be a false positive if your program uses some custom
> stack unwind mechanism or swapcontext
> (longjmp and C++ exceptions *are* supported)
> SUMMARY: AddressSanitizer: stack-buffer-overflow
> /home/fd/git/fuzz-JtR/src/base64_convert.c:241 raw_to_hex
> Shadow bytes around the buggy address:
> 0x10002d5e2790: 04 f4 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00 00 00
> 0x10002d5e27a0: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00
> 0x10002d5e27b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x10002d5e27c0: 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00
> 0x10002d5e27d0: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
> =>0x10002d5e27e0: 00 00 00 00 00 00 00[02]f4 f4 f2 f2 f2 f2 00 00
> 0x10002d5e27f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 04 f2 f2
> 0x10002d5e2800: f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x10002d5e2810: 00 00 00 00 f4 f4 f3 f3 f3 f3 00 00 00 00 00 00
> 0x10002d5e2820: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0x10002d5e2830: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 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
> Container overflow: fc
> Array cookie: ac
> Intra object redzone: bb
> ASan internal: fe
> ==26467==ABORTING
>
>
> Is there an easy way to reproduce this problem for a bleeding-jumbo
> version without the --fuzz option?
>
> Frank
>
--
loverszhaokai
motto：You got a dream and you gotta protect it.
github：https://github.com/loverszhaokai
blog：http://www.cnblogs.com/lovers/
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