Not to be rude but in my point of view, it is just paranoia. It would be easier
just to go to a bank, and do whatever you want there.
But technically, yes you can do something like this with just running vnc
viewer which does not require admin right.
An ssh client placed on a webpage owned by you
(http://www.appgate.com/products/80_MindTerm/) and with this java based client
you can tunnel your connection and connect to your personal computer's screen.
For your scenario, last part is not logical, when you connect to your personal
machine, It is better if you use Roboform or something like that will stop
anybody to see your password. It will form password into the web page.
Cheers
Mehmet
-----Original Message-----
From: Antonio Fontes [mailto:saphyr@infomaniak.ch]
Sent: Thursday, April 07, 2005 12:14 AM
To: webappsec@securityfocus.com
Subject: Re: keyloggers?
What would be your feeling about this scenario ?
- setting a computer for remote access like vnc or remote desktop
- encapsulate the connection into a ssh tunnel using cygwin
or a linux/unix gateway with a ssh daemon running
- connect to your personnal computer through the secured tunnel
- launch a virtual keyboard on your personnal computer. this virtual
keyboard can be made in any common RAD language or even
a simple javascript : a keyboard is drawn on the screen, and you
click the letters to compose your strings.
- thanks to windows OLE stuff, you select the string with the mouse
and drop it into a web form for example. the string does not get
'copied' to the clipboard through this manipulation.
- disconnect when you're done.
Some remarks:
- they should be able to capture your keystrokes : there won't be any.
- they should be able to capture your mouse click positions : just
improve your virtual keyboard to redraw the keys in another position
after X mouse clicks.
- they should be able to capture your transmitted data. I admin they
still can decode it through ssh sniffers and mitm attacks BUT : if you
use a remote access sending graphical information, such as VNC ,
that would need a huge effort to reconstitute 'what you saw'.
- the last possible failure would be the case where they see or record
everything you see. About 'seeing' : try to go to a cyber cafe running
fully privileged accounts (there are many who simply restore disk images
at reboot time) and kill every thing you can in the task manager.
About 'recording' what you see : are there really many places where they
can record every client's desktop view ?
There's still a risk, I know there are tools which are unseen in the task
manager but... come on... If you're that paranoid, you wouldn't even
open an e-banking account.
my 2 (swiss) cents...
AF
