full-disclosure - NULL pointer crash in freeSSHd 1.20

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Message-Id: <20080219231033.2108f539.aluigi@autistici.org>
Date: Tue, 19 Feb 2008 23:10:33 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, news@...uriteam.com,
	full-disclosure@...ts.grok.org.uk, vuln@...unia.com,
	packet@...ketstormsecurity.org
Subject: NULL pointer crash in freeSSHd 1.20


#######################################################################

                             Luigi Auriemma

Application:  freeSSHd
              http://www.freesshd.com
              Note: is possible that the problem affects also
              wodSSHServer anyway this has not been tested
Versions:     <= 1.2.0
Platforms:    Windows
Bug:          NULL pointer crash
Exploitation: remote
Date:         17 Feb 2008
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org


#######################################################################


1) Introduction
2) Bug
3) The Code
4) Fix


#######################################################################

===============
1) Introduction
===============


freeSSHd is a free SSH server for Windows.


#######################################################################

======
2) Bug
======


The server can be crashed through a NULL pointer access simply sending
a SSH2_MSG_NEWKEYS packet as first command.


#######################################################################

===========
3) The Code
===========


http://aluigi.org/poc/freesshdnull.zip


#######################################################################

======
4) Fix
======


No fix


#######################################################################


--- 
Luigi Auriemma
http://aluigi.org

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