Advisory : Phishing Vulnerability in Verisign Network
Dated :  5 July 2007
Severity : Critical

Explanation:

The Verisign Secured Network and Verisign Weblogs network is vulnerable to
phishing . The problem persists in the redirection links present which
allows third party redirection. The cause :

1. Redirection of traffic directly without visiting website.
2. The website wont check the link that is being called by the phisher.
3. Third party linking is possible.
4. Looping attack is also possible.

The vulnerable links are:

1. http://www.verisignsecured.com/Redirect.aspx?[ website name ]
2. http://www.weblogs.com/clickthru?url=[website name]

It is considered as vulnerable because the clickthru parameter can be
initialised
to any website not related to main website links respectively.

Examples:
1]http://www.weblogs.com/clickthru?url=http://www.unep.org/Documents.Multilingual/Default.asp?DocumentID=' 


2]http://www.weblogs.com/clickthru?url=http://www.weblogs.com/clickthru?url=http://www.pewinternet.org/report_display.asp?r=');-- 


3]http://www.verisignsecured.com/Redirect.aspx?http://www.unep.org/Documents.Multilingual/Default.asp?DocumentID=' 


4]http://www.verisignsecured.com/Redirect.aspx?http://www.weblogs.com/clickthru?url=http://www.weblogs.com/clickthru?url=http://www.pewinternet.org/report_display.asp?r=');-- 


5]http://www.verisignsecured.com/Redirect.aspx?http://www.weblogs.com/clickthru?url=http://www.weblogs.com/clickthru?url=http://www.weblogs.com/clickthru?url=http://www.google.com 



Vendor Status : Reported.


Regards
Aditya K Sood
http://www.secniche.org



_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/