RE: Terminal Service Port Change?
- From: "Jim Harrison" <Jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 13 Apr 2005 19:00:56 -0700
Normally I don't disagree with Tim cuz he's bigger than me, but given
that port scanning is absurdly simple (every script-kiddie worth their
salt can do it in their sleep) I can't see the value in port changing
for its own sake.
Even I can write a tool that will scan all 65365 TCP and UDP ports in
less than 10 seconds.
It takes very little more to make a few fingerprinting tests that will
tell me what lives at a listening port.
The time it takes to make sure everyone and everything involved knows
how to use it and that it's properly documented, etc., etc. just makes
it not worth the time any more.
If you have to do this because of resource restrictions, then so be it;
but don't play "port-games" just because you can.
-------------------------------------------------------
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: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx]
Sent: Wednesday, April 13, 2005 18:08
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Terminal Service Port Change?
http://www.ISAserver.org
Joking aside, there is actually a very valid reason to change default
ports
for services where applicable, and that is to avoid "standard" scanning
and/or worm activity. Greg is absolutely correct in that obscuring a
service via port change will not thwart a directed attack, but security
through obscurity does work as long as the target remains obscure. RDP
services on alt ports are difficult to detect unless you can hit the box
with RCP and are an admin (without port scanning by instantiating a TS
handle), or unless you can hit the box with NetBIOS and proxy requests
for
server registration through the Master Browser (even with null sessions
on
weak Win2k installs).
To speak to that old argument, I would say to do *both* if you can. Of
course, you are right in that some programs don't like alt ports (or
more
directly, some *clients* don't like alt ports) but when it comes to
remote
admin of servers, I have no problem at all, and in fact would recommend,
changing the default ports just to add that extra level of raising the
fruit. (That's not a Navy term, Jim!)
T
----- Original Message -----
From: Ball, Dan
To: [ISAserver.org Discussion List]
Sent: Wednesday, April 13, 2005 5:17 PM
Subject: [isalist] RE: Terminal Service Port Change?
http://www.ISAserver.org
Yep, goes back to the same old argument, do you hide the port to make it
harder to find, or just rely upon the security in place to make a known
port
safe? I prefer to leave "most" things at their default port, makes it
easier for me to do my job, some programs don't like using alternate
ports.
From: Greg Mulholland [mailto:greg@xxxxxxxxxxxxxx]
Sent: Wednesday, April 13, 2005 18:12
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Terminal Service Port Change?
http://www.ISAserver.org
True, but if your going to leave rdp unprotected, or anything for that
matter, we'll find it.. no matter what port you hide it on.
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