RE: [lists] Re: sniffing plaintext protocols

["Curt Purdy" <purdy () tecman com>]

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

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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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