RE: Open Ports

From: "Thor \(Hammer of God\)" <thor@xxxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Date: Thu, 19 Jan 2006 13:36:57 -0800

I don't know that I agree with that-- port knocking is just port knocking. It's how it is used that makes it malicious or not.

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"I'll see your Llama and up you a Badger."
John T

----- Original Message ----- From: "Jim Harrison" <Jim@xxxxxxxxxxxx> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> Sent: Thursday, January 19, 2006 1:24 PM Subject: [isalist] RE: Open Ports


http://www.ISAserver.org

"port knocking" as understood by the majority of the security community *is* malicious.


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  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!
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-----Original Message-----
From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx]
Sent: Thursday, January 19, 2006 12:08
To: [ISAserver.org Discussion List]
Subject: RE: [isalist] RE: Open Ports

True. However, with the assumption that a) you actually own the system and b) you want to use the port-knocking mechanism (therefore making it wanted code), the concept isn't bogus. My intention is to have a go at it on my testing environment, just because it'd be fun to try. :P I wouldn't dream of even mentioning the concept at a customer. As far as 'owning the machine', I can imagine you're also referring to the fact I don't 'own' the ISA server's internals. True. Combining an ISA server as back-end with, say, a UNIX machine in front with port-knocking on it, however, would solve that problem. I'm also aware there are plenty of progs available to do that for me, but, ah hell, I like playing around with code at times. ;)


________________________________

From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Thu 19-1-2006 20:56
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Open Ports

http://www.ISAserver.org

The basic idea behind port-knocking is that you have installed an agent that can control your (local or remote) firewall policies. If you've accomplished the task of installing unwanted code on a machine that you don't (actually) own, you've wasting time simply dorking about with firewall policies.

-------------------------------------------------------
  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!
-------------------------------------------------------


-----Original Message-----
From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx]
Sent: Thursday, January 19, 2006 11:45
To: [ISAserver.org Discussion List]
Subject: RE: [isalist] RE: Open Ports


Why bogus ?

________________________________

From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: Thu 19-1-2006 20:41
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Open Ports

http://www.ISAserver.org

Port-knocking is a bogus concept.
If you can place your agent on the firewall, it's game over anyway.

-------------------------------------------------------
  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!
-------------------------------------------------------


-----Original Message-----
From: Geldrop, Paul van [mailto:paul.van.geldrop@xxxxxxxxxxxxx]
Sent: Thursday, January 19, 2006 11:34
To: [ISAserver.org Discussion List]
Subject: RE: [isalist] RE: Open Ports

Actually, the concept of port-knocking applies to this example rather beautifully.. shame it's not available for ISA 2004. Though I do plan to have a go at a script for that, just because I wanna. :P

Paul

http://blogs.dirteam.com/blogs/paul


________________________________

From: Alexandre Gauthier [mailto:gauthiera@xxxxxxxxxxxxxxxxx]
Sent: Thu 19-1-2006 19:59
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Open Ports

http://www.ISAserver.org

Whenever I hear GRC.com I shudder and start loosing hair. The vision of Gibson's plump moustache brings vile, unspeakable things back to rise around the taste buds on the back of my tongue.

And indeed "opening a port" (haha one more kitten/isa just died)only when requested... wouldn't that be the equivalent of leaving it open?

It's akin to plugging your ears shut and opening them only when the phone rings. How will you know it is ringing and that someone attempts to communicate with you?

Either I misunderstood or something here is clearly illogical.

-----Message d'origine----- De : Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Envoyé : 19 janvier 2006 12:09 À : [ISAserver.org Discussion List] Objet : [isalist] RE: Open Ports

http://www.ISAserver.org

You've been to GRC.com again, haven't you? :-P Both HTTP and FTP use the TCP protocol to get where they're going. It's a basic precept of TCP communications that you can't respond to a connection request if you don't accept them.

-------------------------------------------------------
  Jim Harrison
  MCP(NT4, W2K), A+, Network+, PCG
  http://isaserver.org/Jim_Harrison/
  http://isatools.org
  Read the help / books / articles!
-------------------------------------------------------


-----Original Message-----
From: Tom Rogers [mailto:trogers@xxxxxxxxxxxxxxxxxx]
Sent: Thursday, January 19, 2006 08:59
To: [ISAserver.org Discussion List]
Subject: [isalist] Open Ports

Ports 80 and 21 are open statically on my ISA 2000 SP-2 server. I publish websites through ISA and a single FTP site. How do I make these ports open dynamically - only when proper access is needed?

TIA,

-Tom Rogers
ISA Rookie

All mail to and from this domain is GFI-scanned.


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