Great Circle Associates Firewalls
(January 1996)
 

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Subject: Re: Closing the NetBeui over TCP Port
From: adept @ minerva . cis . yale . edu (Ben)
Date: Wed, 24 Jan 96 18:29:42 EST
To: ppmorris @ syr . edu (Peter Morrissey), firewalls @ greatcircle . com

On Wed, 24 Jan 1996, Peter Morrissey wrote:

> I'm interested in peoples' opinions on having a security
> policy that closes off this port (actually 137,138, 139) at
> the Internet firewall. Some are saying that they should
> be allowed to share there Win/95 and Win/NT resources 
> over the Internet. My feeling is that there are better
> ways to accomplish this, and that it might be dangerous
> to do it this way.

I really don't know too much about NetBEUI, but it strikes me that 
anytime that you allow any protocol to pass through the firewall without 
having it examined, you're asking for trouble.

There exists the very real danger that the person with the 
Win/95/NT box sitting on their desk could be the focal point of a well 
mounted attack that used their machine as a router between the outside 
world and your internal net completely bypassing your firewall.

So, yes, I'd be very inclined to agree with your analysis.

Ben.
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Ben Samman .
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 samman @
 cs .
 yale .
 edu
"If what Proust says is true, that happiness is the absence of fever, then
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