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freesshdnull.txt

freesshdnull.txt
Posted Feb 20, 2008
Authored by Luigi Auriemma | Site aluigi.org

freeSSHd versions 1.2.0 and below suffer from a NULL pointer crash vulnerability.

tags | advisory
SHA-256 | ac84698704e52b768afadad35309db8a5e3ee57c473f3cceb4d439c0b10901ce

freesshdnull.txt

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

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@autistici.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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