Re: [PEN-TEST] eMail auditing problem

[Erik Tayler <nine () 14X NET>]

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Just to clarify (and try not to seem picky), the sniffer doesn't need
to reside "between the source of the email and the destination". It
can reside on the server sending mail, or the server receiving mail,
as well as anything in-between. Just seemed like something was left
out.

Erik Tayler
http://www.14x.net/fx

- -----Original Message-----
From: Penetration Testers [mailto:PEN-TEST () SECURITYFOCUS COM]On
Behalf
Of Justin Schaefer
Sent: Wednesday, September 13, 2000 12:05 PM
To: PEN-TEST () SECURITYFOCUS COM
Subject: Re: eMail auditing problem


in order to sniff someones email, the person sniffing would need root
access
on a machine between the source of the email and the destination. the
person
would then run a packet sniffer, like dsniff or snoop, and filter the
input,
to only see what they wanted to see. If you are sure this is
happening,
traceroute from your mail server to a destination where your client
believes
his mail is being read. Start by checkign out all machines on your
local
network for unusual traffic/programs/users logged in etc... and
search the
drives fro files that shouldnt be there. logs.. etc. then move on to
the
next hop in the traceroute. Once you have gone as far as you can in
this
manner, and you can confirm that the email is being raed, it may be
time to
start alerting admins at other isps, or carriers. Just keep following
the
traceroute, until you find him. Chances are however, that it is
somewhere on
your clients network.

- -Justin

- -----Original Message-----
From: Groh, Jens [mailto:jgroh () LPC-COMPUTER DE]
Sent: Wednesday, September 13, 2000 8:17 AM
To: PEN-TEST () SECURITYFOCUS COM
Subject: [PEN-TEST] eMail auditing problem


Hi Folks,

as I'm new to the security scene I have to ask you a questions:

I've heard from a customer, that he believes, that all of his
outgoing mail
is read by someone using an email sniffer! My
question now is: has that to be server sided? I mean can anyone use
this
email sniffer or has he or she already hacked the
outgoing mail server?

How is this to be done?
What programms?
What procedure?
How would you do that?

Thanx in advance,

Jens Groh
Hostmaster / Security
LPC GmbH
Germany

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