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Category:   Application (Forum/Board/Portal)  >   PostNuke Vendors:   postnuke.com
(Vendor Issues Fix) Re: PostNuke Input Filtering Error in 'modules.php' Facilitates Remote Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1005653
SecurityTracker URL:  http://securitytracker.com/id/1005653
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 18 2002
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.72
Description:   GemSEC reported an input validation vulnerability in PostNuke in the 'sid' argument of 'modules.php'. A remote user can conduct cross-site scripting attacks against PostNuke users.

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 PostNuke 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://ip.ad.dr.ess/postnuke/html/modules.php?op=modload&name=News&file=article&sid=<script>alert(document.cookie);</script>exploitstring

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running PostNuke, 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:   The vendor has released a fix containing an updated pnAPI.php module, available at the following locations:

http://developers.postnuke.com/phpBB2/viewforum.php?f=14
http://sourceforge.net/project/showfiles.php?group_id=27927&release_id=119725

Vendor URL:  www.postnuke.com (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 8 2002 PostNuke Input Filtering Error in 'modules.php' Facilitates Remote Cross-Site Scripting Attacks



 Source Message Contents

Subject:  Alert ID: 1005583



The vendor reports the following:

the reported vulnerability is already fixed by an updated pnAPI.php
the sources can be downloaded either via our security outlet at 
http://developers.postnuke.com/phpBB2/viewforum.php?f=14 or on our sf.net 
projectsite at 
http://sourceforge.net/project/showfiles.php?group_id=27927&release_id=119725


 
 


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