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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PBBoard v2.1.4 CMS – Multiple Vulnerabilities
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