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Category:   Application (Forum/Board/Portal)  >   Yet Another Forum.net Vendors:   yetanotherforum.net
'Yet Another Forum.net' Input Validation Holes Permits Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1013632
SecurityTracker URL:  http://securitytracker.com/id/1013632
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Apr 4 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): 0.9.9
Description:   An input validation vulnerability was reported in 'Yet Another Forum.net'. A remote user can conduct cross-site scripting attacks.

The software does not properly validate user-supplied input in several fields. A remote user can submit specially crafted input that, when viewed 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 'Yet Another Forum.net' 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.

The 'name' and 'location' fields are affected. The 'subject' field of a private message is also affected.

The vendor was notified on March 17, 2005.

Maty Siman discovered and reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the 'Yet Another Forum.net' 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.yetanotherforum.net/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Yet Another Forum.net XSS vulnerabilities




OVERVIEW
=========

"Yet Another Forum.net (http://www.yetanotherforum.net/)
is a opensource discussion forum or bulletin board system
for web sites running ASP.NET. It is ASP.NET based with a
MS SQL backend database.
The full C# source code is available licensed as GPL. "

Several Cross Site Scripting (XSS) vulnerabilities were found.

DETAILS
=======

Due to insufficient input filtering, any user can
insert malicious script code into "name" and "location" fields
and into the "Subject" field of PM.
The scripts may (for example) steal authentication cookies of users
reading messages written by the malicious user.


VULNERABLE VERSIONS
===================

Yet Another Forum.net Version 0.9.9 is vulnerable to this issue.
Prior version were not tested


SOLUTION
========

Yet Another Forum.net's administrator was informed on March 17, 2005.


CREDITS
=======

The vulnerability was researched by Maty Siman (maty@checkmarx.com)

--
Maty Siman, CISSP
Web: http://www.checkmarx.com/

 
 


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