The characteristics of a Telnet connection are significantly different from a standard SMTP connection and some firewall proxies can recognize and drop Telnet connections but what's the point? It's trivial to create an interactive SMTP emulation that would bypass this check. The port is designed to for TCP connections that passes ASCII text characters. What would you be accomplishing by preventing/dropping Telnet connections?
-- Bill Stackpole, CISSP
| Ronneil Camara <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 08/23/00 08:09 AM
|
To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]> cc: Subject: SMTP servers |
I've noticed that when I telnet to any mail servers on port 25, I can send
email to anyone using SMTP commands. Is there a way to stop this?
Thanks.
Onie
--
.-------------------------------------------------------.
o^o | Ronneil Camara | [EMAIL PROTECTED] |
/V\ |--------------------| +632 6354086 +63917 5326993 |
// \\ | "The only way to `----------------------------------|
/( )\ | stop a hacker is to think like one." |
^^-^^ | ...brilliant misguided youth |
`-------------------------------------------------------'
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
