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Category:   Application (Forum/Board/Portal)  >   YaBB Vendors:   YaBB Development Team
YaBB Input Validation Error in 'usersrecentposts' Lets Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1013420
SecurityTracker URL:  http://securitytracker.com/id/1013420
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 12 2005
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Exploit Included:  Yes  
Version(s): YaBB2 RC1
Description:   Alireza Hosseini and Leyla Bagheri of PersianHacker.NET Security Team reported an input validation vulnerability in YaBB in 'usersrecentposts'. A remote user can conduct cross-site scripting attacks.

The software does not properly validate user-supplied input in the 'usersrecentposts' action. The 'username' field is not properly filtered to prevent HTML code. 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 URL is provided:

http://[target]/YaBB.pl?action=usersrecentposts;username=<IFRAME%20SRC%3Djavascript:alert('XSS-Vulnerability')><%252FIFRAME>

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:  [PersianHacker.NET 200503-08] YaBB2 rc1 XSS Vulnerability


[PersianHacker.NET 200503-08] YaBB2 rc1 XSS
Vulnerability
Date: 2005 March
Bug Number: 08

YaBB 
is a leading free forum software package that rivals
any professional message board out there. It provides
a real-time chat and support system for your visitors.

More info @:
http://www.yabbforum.com/


Discussion:
--------------------
XSS Vulnerability in 'usersrecentposts' that may allow
a remote user to launch cross-site
scripting attacks.

This issue could permit a remote attacker to create a
malicious URI link that includes
hostile HTML and script code. If this link were to be
followed, the hostile
code may be rendered in the web browser of the victim
user. This would occur in
the security context of the affected Web site and may
allow for theft of cookie-
based authentication credentials or other attacks.

This vulnerability is reported to exist in YaBB2 rc1,
other versions might
also be affected. 

Exploit:
--------------------
http://www.example.com/YaBB.pl?action=usersrecentposts;username=<IFRAME%20SRC%3Djavascript:alert('XSS-Vulnerability')><%252FIFRAME>


Solution:
--------------------
no solution at this time.


Credit:
--------------------
Discovered by PersianHacker.NET Security Team
by Alireza Hosseini (trueend5 yahoo com)
http://www.PersianHacker.NET


Help
--------------------
Read our whitepaper about XSS Vulnerability (only in
FARSI language):
http://www.persianhacker.net/articles/article-2322.html
visit: http://www.PersianHacker.NET
or mail me @: trueend5 yahoo com


		
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