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Re: [FW-1] [fw-1] Instant Messenger bypass FW-1



We are in the process of changing operating systems on all our PCs and I am
going to seriously attempt to just block my users from installing software
on their PCs.  The theory being of course that if they can't install
anything, they can't put IM clients or any of the other various and sundry
useless, time wasting, PC eating garbage they are so fond of.  I just wonder
if anyone else has managed this and how effective it has been.

Jim Edwards

-----Original Message-----
From: Rocky Stefano [mailto:[email protected]]
Sent: Wednesday, June 12, 2002 9:43 AM
To: [email protected]
Subject: Re: [FW-1] [fw-1] Instant Messenger bypass FW-1


This has long been a known problem. Its not a vulnerability with any
firewall. There are several methods available to stop IM's from getting out
of your network.

-----Original Message-----
From: A, Kaustubh [mailto:[email protected]]
Sent: June 12, 2002 9:05 AM
To: [email protected]
Subject: [FW-1] [fw-1] Instant Messenger bypass FW-1


Folks,

I came to know about an article of Gartner saying that their are some IM
bypassing Firewall by scanning open ports.
Has anybody tested this CP FW-1 NG? I am afraid if this is a problem with
FW-1!!!


 Firewall Bypass Technology


 AOL's Instant Messenger has a uniquely slippery client that is
 designed to bypass firewall port blocking technology, making the
 product easy to configure from behind a firewall. For example, the
 AOL client will use any available port, scanning even those reserved
 for domain naming system (DNS) lookup. This technology enables
 unsophisticated users to sneak past a firewall with relative ease,
 effectively establishing breaches in the corporate firewall.




Kaustubh A.
Technical Consultant
HP Services
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