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Bugtraq: Directory traversal in 2X ThinClientServer v5.0_sp1-r3497

Directory traversal in 2X ThinClientServer v5.0_sp1-r3497

From: Luigi Auriemma <aluigi_at_autistici.org>
Date: Mon, 31 Mar 2008 21:48:47 +0200

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

                             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_at_autistici.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
Received on Mar 31 2008

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