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Category:   Application (Forum/Board/Portal)  >   YaBB Vendors:   YaBB Development Team
YaBB Input Validation Hole in 'categories' Parameter Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1016684
SecurityTracker URL:  http://securitytracker.com/id/1016684
CVE Reference:   CVE-2006-4157   (Links to External Site)
Updated:  Jun 8 2008
Original Entry Date:  Aug 11 2006
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  

Description:   A vulnerability was reported in YaBB. A remote user can conduct cross-site scripting attacks.

The software does not properly filter HTML code from user-supplied input in the 'categories' parameter before displaying the input. A remote user can create a specially crafted URL that, when loaded by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the YaBB software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

A demonstration exploit is provided:

index.php?action=faqmy&myfaq=yes&id_cat=1&categories=<script>alert("xss")</script>

OUTLAW discovered this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the YaBB software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   No solution was available at the time of this entry.
Vendor URL:  www.yabbforum.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Yabb XSS

###########################################################################################

#Aria-Security.net Advisory                                                               #

#Discovered  by: OUTLAW                                                                   #

#< www.Aria-security.net >                                                                #

#Gr33t to: A.u.r.a  & C0d3r & l2odon & R@1D3N @ DrtRp &                                   #

###########################################################################################

#Software: YaBB								                           

#Attack method: Cross Site Scripting                                                      

#											  

# 											  

#Proof of Concept:								   	  

#											  

#index.php?action=faqmy&myfaq=yes&id_cat=1&categories=<script>alert("xss")</script>       

#   											  

#----------------------------------------------------------                               

#               									  

#Solution										  

#										   	  

#No Solutions										  

#									                  

#Contact : Outlaw@aria-security.net                                                       

#                                                                                         



 
 


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