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gswsshit.txt

gswsshit.txt
Posted Jan 2, 2008
Authored by Luigi Auriemma | Site aluigi.org

Georgia SoftWorks SSH2 Server versions 7.01.0003 and below are vulnerable to format string and buffer overflow vulnerabilities.

tags | advisory, overflow, vulnerability
SHA-256 | 9bc627a765585240639ddac60046d1c9debb996c1a46fe0bd10acb38328c4bf8

gswsshit.txt

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

Luigi Auriemma

Application: Georgia SoftWorks SSH2 Server (GSW_SSHD)
http://www.georgiasoftworks.com/prod_ssh2/ssh2_server.htm
Versions: <= 7.01.0003
Platforms: Windows
Bugs: A] format string in the log function
B] buffer-overflow in the log function
C] buffer-overflow in the handling of the password
Exploitation: remote
Date: 02 Jan 2008
Author: Luigi Auriemma
e-mail: aluigi@autistici.org
web: aluigi.org


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


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


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

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


GSW_SSHD is a well known commercial SSH server which acts as SSH tunnel
for the telnet server GS_Tnet.exe.


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

=======
2) Bugs
=======

------------------------------------
A] format string in the log function
------------------------------------

The logging function used by the server is affected by a format string
vulnerability caused by the usage of vsprintf for building the first
message (like "LoginPassword(%s(%s)[%u])") and the usage of another
vsprintf for building the final log entry.
The bug can be exploitable through the username field.


--------------------------------------
B] buffer-overflow in the log function
--------------------------------------

A buffer-overflow vulnerability is located in the same logging
function.
It's enough to use an username longer than 10000 chars to exploit the
vulnerability.


--------------------------------------------------
C] buffer-overflow in the handling of the password
--------------------------------------------------

The server is affected also by another buffer-overflow this time
located in the instructions which handle the password supplied by the
client exploitable through a string longer than 800 chars.


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

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


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


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

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


No fix


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


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