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RE: ESTMP Exploits & Security
From: "JTH" <jth () visi com>
Date: Wed, 17 Mar 2004 12:41:12 -0600

-----Original Message-----
From: Dante Mercurio [mailto:Dante () webcti com]
Sent: Wednesday, March 17, 2004 12:35 PM
To: JTH; security-basics () securityfocus com
Subject: RE: ESTMP Exploits & Security

I seem to remember a firewall or gateway product that distinguished
telnet attempts to an SMTP service by the fact that a manual telnet
session sends each character in a separate packet, and a true mail
connection does not.

I don't remember much detail, but may be a good place to start.

I've seen one or two of these; the problem with this is I can go into a
GUI mail client and pop in my client's SMTP server as my SMTP server,
never even needing to open a command line. So while a product like this
would mitigate one form of email spoofing, it's easily worked around.


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