Vulnerability found:
18 December 2009


Vendor informed:
18 December 2009


Severity level:
Medium


Credits:
Richard Brain & Jan Fry - ProCheckUp Ltd (www.procheckup.com)


Description:
Commonspot server is vulnerable to a vanilla XSS

Vulnerable server-side script: 'commonspot/utilities/longproc.cfm'

Unfiltered parameter: 'arbitrary'

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 RSA Authentication Agent login page. Such code would run within the 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 or passwords) to unauthorised third parties


Proof of concept:
https://target-domain.foo/commonspot/utilities/longproc.cfm?onlyurlvars=1&url=%27;--%3E%3C/script%3E%3Cscript%3Ealert%281%29%3C/script%3E


References:
BID 37986
http://www.securityfocus.com/bid/37986/


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