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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 172.16.1.1 connects to a remote host foo.com
using telnet by entering "telnet foo.com" from a command prompt which
would normally connect to 192.168.1.1 (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.
<snip>

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


Curt Purdy CISSP, GSNA, GSEC, CNE, MCSE+I, CCDA 
Information Security Officer 
Information Systems Security
infosysec.net
443.846.4231

-------------

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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