ProCheckUp Security Advisory 2009.19

`PR09-19: Cross-Site Scripting (XSS) on CommonSpot server  
  
Vulnerability found: 17th December 2009  
  
Vendor informed: 18th December 2009  
  
Severity: Medium  
  
Successfully tested on: Commonspot server  
  
http://www.paperthin.com/  
  
  
Description:  
  
Commonspot server is vulnerable to a vanilla XSS  
  
Vulnerable server-side script: 'commonspot/utilities/longproc.cfm'  
  
Unfiltered parameter: 'arbitrary'  
  
  
Notes:  
  
  
Simple XSS Proof of Concept (PoC) URL:  
  
https://target-domain.foo/commonspot/utilities/longproc.cfm?onlyurlvars=1&url=%27;--%3E%3C/script%3E%3Cscript%3Ealert%281%29%3C/script%3E  
  
  
Consequences:  
  
An attacker may be able to cause execution of malicious scripting code  
in the browser of a victim user who clicks on a link to a CommonSpot server.  
  
This type of attack can result in non-persistent defacement of the  
target site, or the redirection of confidential information (i.e.:  
session IDs or passwords) to unauthorised third parties.  
  
  
  
Credits: found by Richard Brain & Jan Fry - 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.  
`