TFTPUtil GUI TFTP Directory Traversal

[vuln_research () princeofnigeria org]

Title: TFTPUtil GUI TFTP Directory Traversal
Product: TFTPUtil GUI

Discovered: November 26, 2008
Discovered by: Rob Kraus, princeofnigeria (PoN)

Vendor: k23productions
Vendor URL: http://sourceforge.net/projects/tftputil
Vendor notification date: December 1, 2008
Vendor response date: December 8, 2008
Vendor acknowledgement: December 8, 2008
Vendor provided fix: December 8, 2008
Release coordinated with the vendor: --
Public disclosure date: January 14, 2009

Affects: TFTPUtil GUI versions 1.2.0 and 1.3.0
Fixed in: 1.4.0
Risk: Medium

Vulnerability Description: TFTPUtil GUI versions 1.2.0 and 1.3.0 are prone to a directory-traversal vulnerability 
because it fails to sanitize TFTP GET requests. By using a specially crafted TFTP GET request an attacker is capable of 
retrieving files outside of the TFTP root directory.

Impact: The ability to obtain files outside of the TFTP root directory may allow an attacker to obtain more information 
about the underlying operating system and applications running on the host.

Keywords: security, vulnerability, tftp, directory traversal, princeofnigeria, gui, windows, server

[--Background--]

Type of vulnerability: Input validation flaw
Who can exploit it: Local and remote users

TFTPUtil GUI is an application that provides services for transferring configuration files, firmware files and other 
types of data using the TFTP protocol. The application should restrict GET requests to the contents of the TFTP root 
directory to prevent obtaining data from other parts of the host operating system.

Vulnerability Scope: The default installation of TFTPUtil 1.20. or 1.3.0 will allow exploitation of this vulnerability.

[--More Details--]

Exploitation of this flaw is trivial and can be executed using any RFC 1350 compliant TFTP client software. No exploit 
code is required.

[--Fix or Workaround Information--]

Patch availability: 1.4.0
Vendor provided fix: 1.4.0
Workarounds: Update to 1.4.0

[--Disclosure Policy--]

PrinceofNigeria.org Vulnerability Disclosure Policy
http://www.princeofnigeria.org/blogs/index.php/vulndev/vulnreleasepolicy/?blog=1

[--Disclosure History--]

Public disclosure date: January 14, 2009

[--References--]
CVE-ID:
Bugtraq ID:
Secunia ID:
OSVDB ID:

[--Author--]
Rob Kraus, princeofnigeria (PoN)
Website: www.princeofnigeria.org/blogs