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RE: [lists] Re: sniffing plaintext protocols
From: "Curt Purdy" <purdy () tecman com>
Date: Mon, 31 Jul 2006 18:39:41 -0400

Dotzero wrote:
User A at IP address connects to a remote host foo.com
using telnet by entering "telnet foo.com" from a command prompt which
would normally connect to (using RFC 1918 addresses rather
than real ones).

Evil person B has access to a router that is in the path between user
A and the telnet server for foo.com. Evil person B sets up a span port
and sniffs traffic to his hearts content....including the telnet
session. Note that evil person B is not on the same network segment as
either of the endpoints. Obviously, this is a simplified and contrived
example that ignores asymetric routing, etc.

Which is why I require all users to use only SSH with no port 23 allowed at

Information Security Officer 
Information Systems Security


If you spend more on coffee than on IT security, you will be hacked. 
What's more, you deserve to be hacked. 
-- former White House cybersecurity czar Richard Clarke 

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