Security Basics mailing list archives
Re: virus mail ignores MX?
From: Pierre-Yves Bonnetain <py.bonnetain () ba-cst com>
Date: Mon, 14 Jun 2004 09:26:18 +0200
Hi,
some virus mails are filtered well at viruswall. but other virus mails are not get through viruswall, and go directly to mail.xxxxx.com. I think. so I think some virus mail ignores MX, right? What's the problem and how can I solve this problem?
You are right. Some virus (and spam senders) go for the secundary MXes instead or the primary. You cannot do anything against that (except using only one primary MX, of course) since this choice is made on the sender's side. The best thing to do, whenever you have several MXs, is to have functionally identical systems, with the same configuration, tools, etc. That way, whatever the path followed by some mail, it will go through the same checks. Your current configuration is, in this regard, totally unsecure since it's very easy to bypass your virus filters. Hth, -- Pierre-Yves Bonnetain B&A Consultants - Se'curite' informatique - www.ba-cst.com Tel. : +33 (0) 563 277 241 - Fax : +33 (0) 563 277 245 --------------------------------------------------------------------------- Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off any course! All of our class sizes are guaranteed to be 10 students or less to facilitate one-on-one interaction with one of our expert instructors. Attend a course taught by an expert instructor with years of in-the-field pen testing experience in our state of the art hacking lab. Master the skills of an Ethical Hacker to better assess the security of your organization. Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.html ----------------------------------------------------------------------------
Current thread:
- virus mail ignores MX? Monty Ree (Jun 13)
- Re: virus mail ignores MX? Andrej Kacian (Jun 14)
- Re: virus mail ignores MX? Paul Kurczaba (Jun 14)
- Re: virus mail ignores MX? die tuere (Jun 14)
- Re: virus mail ignores MX? Pierre-Yves Bonnetain (Jun 14)
- RE: virus mail ignores MX? Burton M. Strauss III (Jun 14)
- Re: virus mail ignores MX? Ranjeet Shetye (Jun 21)
- <Possible follow-ups>
- RE: virus mail ignores MX? Joshua Vince (Jun 14)
- RE: virus mail ignores MX? Alan Greig (Jun 14)
- Re: virus mail ignores MX? Monty Ree (Jun 16)
- Re: virus mail ignores MX? Mircea MITU (Jun 18)
- RE: virus mail ignores MX? Keith T. Morgan (Jun 22)