full-disclosure - Re: FuzzDiff tool

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Date: Tue, 17 Aug 2010 16:05:08 +0300
From: Henri Salo <henri@...v.fi>
To: Dan Rosenberg <drosenberg@...curity.com>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: FuzzDiff tool

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On Mon, 26 Jul 2010 16:53:28 -0400
Dan Rosenberg <drosenberg@...curity.com> wrote:

> Hello,
> 
> I'd like to announce FuzzDiff, a simple tool to help make crash
> analysis during file format fuzzing a bit easier.  I'm sure many
> people have written similar tools for their own purposes, but I
> haven't seen any that are publicly available.  Hopefully at least one
> person finds it useful.
> 
> When provided with a fuzzed file, a corresponding original un-fuzzed
> file, and the path to the targeted program, FuzzDiff will selectively
> "un-fuzz" portions of the fuzzed file while re-launching the
> application to monitor for crashes.  This will yield a file that still
> crashes the target application, but contains a minimum set of changes
> from the original, un-fuzzed file.  This can be useful in pinning down
> the exact cause of a crash.
> 
> The tool is written in Python and currently only works on Unix-based
> systems, since it monitors for crashes by checking for SIGSEGV.  It
> also assumes that the target program adheres to the syntax "[program]
> [args] [input file]".  Both of these limitations can be easily worked
> around.  The code is hardly what I'd call production-ready, but it
> gets the job done.
> 
> The tool is available at:
> http://vsecurity.com/resources/tool
> 
> Happy hacking,
> Dan Rosenberg

Please open bug-tracker for FuzzDiff and put the program under some
version controlling software.

You have temporary file vulnerability in FuzzDiff
(5b6b5c6c22c1103b4169b9fe6e7bfbc3
c0ce0235f8f0026988c60a3217233c36d829ecdf). Maybe you want to use
this module: http://docs.python.org/library/tempfile.html

Best regards,
Henri Salo
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