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

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