bugtraq - Re: Tornado www-server v1.2: directory traversal, buffer overflow

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Date: Mon, 2 Jun 2003 09:40:22 +0200
From: "Berend-Jan Wever" <SkyLined@...p.tudelft.nl>
To: "D4rkGr3y" <grey_1999@...l.ru>, <bugtraq@...urity.nnov.ru>,
	<bugtraq@...urityfocus.com>
Subject: Re: Tornado www-server v1.2: directory traversal, buffer overflow


I've done a quick debugging session: The overflow does not seem exploitable
other then a DoS.
What happens is that there is not enough heap to hold the long strings so it
writes past the heap to a location where no memory is allocated. This will
cause an unhandled exception.

Kind regards,

Berend-Jan Wever.

----- Original Message ----- 
From: "D4rkGr3y" <grey_1999@...l.ru>
To: <bugtraq@...urity.nnov.ru>; <bugtraq@...urityfocus.com>
Sent: Friday, May 30, 2003 1:09
Subject: Tornado www-server v1.2: directory traversal, buffer overflow
<snip>
>  This server is one BiG problem. IMHO is most dangerous server.
>  Main bug in DNA ;D Attacker may see any files in system (but
>  only if he know path and filename), may crash server (and exec
>  malicious code) by sending long http request. Examples:
>
>  www.server.com/../existing_file           <-file be showed
>
>  www.server.com/aa[more than 471 chars]
> |                                                              |
> #--------------------------------------------------------------#
> | Exploit:                                                     |
>   ~~~~~~~~
>
>  Naah, its not interesting. Lets authors code something better.
<snip>