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PBBoard CMS 2.1.4 CSRF / Cross Site Scripting

PBBoard CMS 2.1.4 CSRF / Cross Site Scripting
Posted Jul 16, 2012
Authored by Ibrahim El-Sayed, Vulnerability Laboratory | Site vulnerability-lab.com

PBBoard CMS version 2.1.4 suffers from cross site request forgery and cross site scripting vulnerabilities.

tags | exploit, vulnerability, xss, csrf
SHA-256 | 3504eeef961d0a59f49c9ee08fb6ee83c790ce14364fa6fe2751a1e2eab9d1a9

PBBoard CMS 2.1.4 CSRF / Cross Site Scripting

Change Mirror Download
PBBoard v2.1.4 CMS - Multiple Web Vulnerabilities




Common Vulnerability Scoring System:

PBBoard forum is a free and very famous flat-forum bulletin board software.

- LICENSE: http://www.pbboard.com/manual/license.txt
- INSTALL And UPGRADE : http://www.pbboard.com/pbb_manual/README.html
- English Style : http://www.pbboard.com/forums/t6478.html
- Languages : http://www.pbboard.com/forums/index.php?page=pages&show=1&id=6
- Converter: http://www.pbboard.com/forums/index.php?page=pages&show=1&id=3
- contact us: http://www.pbboard.com/forums/index.php?page=send&sendmessage=1

(Copy of the Vendor Homepage: http://www.pbboard.com/ )

The Vulnerability Laboratory Research Team discovered multiple Web vulnerabilities in the PBBoard v2.1.4 forum application.

2012-06-26: Public Disclosure




A persistent web vulnerability is detected in the PBBoard v2.1.4 forum application.
The bug allows remote attackers to implement/inject malicious script code on the application side (persistent).
The persistent vulnerability is located in the add poll function when adding a thread. The malicious code can be injected in the `answer field`.
The output listing page with the pool executed the malicious persistent script code (JS/HTML).
Successful exploitation of the vulnerability can lead to stable (persistent) context manipulation.
Exploitation requires low user inter-action.

Vulnerable Module(s):
[+] Add thread > Add poll

Vulnerable Parameter(s):
[+] [Answer]

Proof of Concept:
The persistent input validation vulnerabilities can be exploited by remote attackers with low privileged
user account & required user inter action. For demonstration or reproduce ...

To reproduce the vulnerability, the attacker should add a new thread and the check on the add poll button. After that
the attacker can add his malicious code in the answer field of the poll. Anyone who's viewing that thread will be
exploited by the malicious code. Such attack can result in session hijacking, redirecting or cookie theft. Moreover,
the persistent XSS can be exploited to launch a CSRF attack to the user and to exploit the other CSRF vulnerabilities
in the same product to completely hack the application.

Poll: <iframe src=http://www.vuln-lab.com></iframe> !
<tr align="center">
<td class="thead" width="95%" colspan="3">
Question :<strong>&<iframe src=http://www.vuln-lab.com></iframe> !</strong>
</tr> <tr>
<td class="row1" width="50%">
<input type="radio" name="answer" value="0">
<iframe src=http://www.vw.de></iframe></td>
<td class="row1" width="40%">
<img src="look/styles/forum/main/images/bar_right.gif" alt="" width="4" height="11"><img src="look/styles/forum/main/images/bar.gif"
alt="" width="0" height="11"><img src="look/styles/forum/main/images/bar_left.gif" alt="" width="4" height="11">
<td class="row1" width="12%" align="center">
Voters: 0 </td>

<td class="row1" width="50%">
<input type="radio" name="answer" value="1">
<[PERSISTENT SCRIPT CODE]></iframe></td>
<td class="row1" width="40%">
<img src="look/styles/forum/main/images/bar_right.gif" alt="" width="4" height="11">
<img src="look/styles/forum/main/images/bar.gif" alt="" width="0" height="11">
<img src="look/styles/forum/main/images/bar_left.gif" alt="" width="4" height="11">
<td class="row1" width="12%" align="center">

The security risk of the persistent input validation vulnerabilities is estimated as medium(+).

Vulnerability Laboratory [Research Team] - Ibrahim El-Sayed [the StOrM) (storm@vulnerability-lab.com)

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. All pictures, texts, advisories, sourcecode, videos and
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modify, use or edit our material contact (admin@vulnerability-lab.com or support@vulnerability-lab.com) to get a permission.

Copyright © 2012 Vulnerability-Lab

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