[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] RE: [FW1] How to block "telnet mail.Mydomain.com 25 "
Consider this an impossibility. Telnet to port 25 is the equivalent to a SMTP communication. There are tricks that could be done with an IDS setup such as looking for the characteristics of telnet (individual characters per packet) and sending a RST back to the source, but at the end of the day, what you have accomplished is ing out only a few crackers. Instead, focus on hardening your email server, removing banners with product names and revision numbers, pen-testing, and having good design and policies for Internet accessible systems. HTH, --- Gavin -----Original Message----- From: John Hardly [mailto:[email protected]] Sent: Monday, January 15, 2001 14:03 Cc: [email protected] Subject: [FW1] How to block "telnet mail.Mydomain.com 25 " Hi all, I'd like to know if anyone has an idea on how to block someone from iniating commands to my sendmail thru "telnet mail.MyDomain.com 25". Please consider both of the cases : the Mail server is behind a firewall or Not. Tanks. -- John Hardly E-mail : john (at) iav (dot) ac (dot) ma ======================================================================== ======== To unsubscribe from this mailing list, please see the instructions at http://www.checkpoint.com/services/mailing.html ======================================================================== ======== ================================================================================ To unsubscribe from this mailing list, please see the instructions at http://www.checkpoint.com/services/mailing.html ================================================================================
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