vBulletin 4.1.3 Open Redirect

`Product: vBulletin  
Version: 3 - 4.1.3  
Release Date: 06/02/2011  
Risk: Low  
Authentication: Not required to exploit.  
Remote: Yes  
  
Description:   
Multiple Open Redirect vulnerabilities in vBulletin version 4.1.3 and below allow remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via the "url" parameter. By appending ?url=http://attackersite.com any number of pages, the user will be redirected to a potentially dangerous site. This is particularly interesting when used on the registration form or the password reset form.   
  
Exploit Example:  
http://forum.pwndshop.com/register.php?do=checkdate&url=http://attackersite.com  
  
Vendor Notified: Yes  
  
Reference:   
http://www.vbulletin.com/forum/showthread.php/381014-Potential-Phishing-Vector?p=2166441  
https://www.owasp.org/index.php/Open_redirect  
  
Credit:  
  
Robert Gilbert  
Senior Consultant  
HALOCK Security Labs, Purpose Driven Security(tm)  
rgilbert [-at-] halock [-dot-] com   
http://www.halock.com   
http://blog.halock.com   
  
  
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`