RE: Bittorrent - utorrent

[Baki Gábor <baki.gabor () infobia hu>]

Hello,

Bad news: if a client can use even tcp 443 to communicate, you may have to
break the ssl channel analyze the traffice and rebuild it again.
But in this case none of your colleagues wanna use their net-bank software.
They'll see your certificate, not the bank's one.
So in this case you probably need a true content filter.

Otherwise: you have to implement some kind of software restriction policy.
If you digitally sign all of the allowed application and if you restrict
your users from running any other software, you may win. ;)

Kind regards,
Gabor Baki


-----Original Message-----
From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On
Behalf Of Ove Dalgard Hansen
Sent: Wednesday, March 07, 2007 8:38 PM
To: focus-ids () securityfocus com
Subject: Bittorrent - utorrent

Hello Everyone,

I am in a bit of trouble,

On a network where i am configuring IDS - using ASA5510 + SSM module, we try
to deny access to Bittorrent downloads - it consumes quite a bit of bandwith
and is not allowed by the company's policy.
We try to filter bittorrent which succedes - but the utorrent changes
protocol and goes by the SSL port 443 and thereby circumvent the IDS, since
its not possible to see the encrypted traffic. 

Does anyone out there have a good idea of how i am to solve the issue?


Best Regards

Ove Hansen
IT-Quality A/S 
Banemarksvej 50F
Denmark - 2605




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