full-disclosure - Re: Python 2.5 (Modules/zlib) minigzip local buffer overflow vulnerability

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Message-ID: <20070315141818.GA24916@suse.de>
Date: Thu, 15 Mar 2007 15:18:18 +0100
From: Marcus Meissner <meissner@...e.de>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Python 2.5 (Modules/zlib) minigzip local
	buffer overflow vulnerability

On Thu, Mar 15, 2007 at 02:16:41PM +0200, Ismail Dönmez wrote:
> On Thursday 15 March 2007 04:26:29 James Matthews wrote:
> > and you would think some bugs we got rid of in open source software!
> 
> str{cpy,cat,...} which don't take an size attribute should be removed from 
> standard libc, I don't see why people still insist on using this insecure 
> variants.

Thanks to _FORTIFY_SOURCE strcpy and strcat to fixed size buffers are
at least protected now.

I however fail to see two things:
- is minigzip included anywhere?

- If you can exploit it by passing stuff on the commandline, I have
  much simpler exploit for you too:

  	minigzip /dev/null; echo 0wN3d\!

Ciao, Marcus

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