ProCheckUp Security Advisory 2009.4

`PR09-04: Cross-Site Scriting on Portwise SSL VPN v4.6  
  
Vulnerability found: 25th March 2009  
  
Vendor informed: 28th April 2009  
  
Vulnerability fixed:  
  
Severity: Medium  
  
Description:  
  
The Portwise portal login page is vulnerable to XSS. Portwise is a  
SSL-VPN portal.  
  
  
Note: Other version might be affected as well  
  
  
The following demonstrate XSS:  
  
1) Login page XSS  
  
https://example.com/wa/auth?&authmech=Assess&reloadFrame=%22;%3Cscript%3Eblah%3C/script%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E  
  
  
  
Consequences:  
  
An attacker may be able to cause execution of malicious scripting code  
in the browser of a user who clicks on a link to a Portwise Portal-based  
site. Such  
  
code would run within the security context of the target domain. This  
type of attack can result in non-persistent defacement of the target  
site, or the  
  
redirection of confidential information (i.e.: session IDs) to  
unauthorised third parties.  
  
  
  
Fix:  
  
Ensure all input parameters (especially "reloadFrame") are filtered  
sufficiently before beign echoed back to the client.  
  
  
References:  
  
http://www.procheckup.com/Vulnerabilities.php  
  
  
  
Credits: George Christopoulos and Jan Fry of ProCheckUp Ltd  
(www.procheckup.com)  
  
  
Legal:  
  
Copyright 2009 Procheckup Ltd. All rights reserved.  
  
Permission is granted for copying and circulating this Bulletin to the  
Internet community for the purpose of alerting them to problems, if and  
only if, the  
  
Bulletin is not edited or changed in any way, is attributed to  
Procheckup, and provided such reproduction and/or distribution is  
performed for non-  
  
commercial purposes.  
  
Any other use of this information is prohibited. Procheckup is not  
liable for any misuse of this information by any third party.  
  
`