full-disclosure - Multiple vulnerabilities in Georgia SoftWorks SSH2 Server 7.01.0003

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <20080102205557.cff7307a.aluigi@autistici.org>
Date: Wed, 2 Jan 2008 20:55:57 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com,
	news@...uriteam.com, full-disclosure@...ts.grok.org.uk, vuln@...unia.com,
	packet@...ketstormsecurity.org
Subject: Multiple vulnerabilities in Georgia SoftWorks
	SSH2 Server 7.01.0003

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

                             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@...istici.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

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/