From: Jon McClintock (jammer@weak.org)
Date: Wed Aug 18 2004 - 14:06:10 EDT
On Wed, Aug 18, 2004 at 08:05:09AM -0000, ramatkal@hotmail.com wrote:
> During a recent Application pen test I came across a url of the form:
>
> http://www.vulnsite.com/cgi-bin/vulnscript.jsp?url=www.website.com&id=12345
>
> I changed the url parameter to something like url=www.google.com and google appeared in my browser. Next, i changed the url to url=www.whatismyip.com, hoping that the ip address of the webserver would be displayed, however, only my ip address was displayed.
>
> This means that my browser is loading the url parameter as opposed to the webserver script fethching the url and then displaying it for me in my browser right? Is this a security issue?
Take a closer look at the HTTP traffic between your browser and the web
server. My bet is that the server script is issuing a browser redirect.
> Assuming that it was the actual webserver script fetching the url parameter and then displaying it for me, I've come up with a few vulnerabilities (listed below) and was hoping that people might like to share some of their ideas.
>
> 1) Can use vulnsite as a proxy (& hack other sites)
> 2) Can port scan using the vuln site by changing url=www.website.com to url=www.sitetoscan.com:port
> 3) Can connect to & port scan machines behind the firewall.
4) Any of the problems associated with cross site scripting, including:
a) Cookie theft
b) Phishing
c) Fraud and misrepresentation
-Jon
------------------------------------------------------------------------------
Ethical Hacking at the InfoSec Institute. All of our class sizes are
guaranteed to be 12 students or less to facilitate one-on-one interaction
with one of our expert instructors. Check out our Advanced Hacking course,
learn to write exploits and attack security infrastructure. Attend a course
taught by an expert instructor with years of in-the-field pen testing
experience in our state of the art hacking lab. Master the skills of an
Ethical Hacker to better assess the security of your organization.
http://www.securityfocus.com/sponsor/InfoSecInstitute_pen-test_040817
-------------------------------------------------------------------------------
This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 10:53:59 EDT