[Mimedefang] HBEDV Reporting broken? - False Positives Reported
Albert E. Whale
aewhale at ABS-CompTech.com
Sun Dec 15 16:19:06 EST 2002
Ashley,
Thanks for the reply, HOWEVER there are other Factors here, which you did not
Read previously.
1. The Entire Class A network is Blocked, Now nothing from Korea or China gets
in. INCLUDING DNS Answers.
2. There is no Virus. Nothing in the Email will distribute a Virus.
This brings up the first question, regarding a possible False Positive, and
secondly Why is a False positive presented on the Mail message. I too have
access to Unfiltered DNS and also from WHOIS Servers. I know where the messages
(allegedly) came from.
The intent is to reduce the Amount of Scanning, probing and SPAMming from Asia.
For the most part, it is effective. However, I cannot explain the the False
Positive in the Email Message.
I didn't mean to overwhelm you, just trying to keep this message focused.
Thanks and Have a Great Day!
"Ashley M. Kirchner" wrote:
> Albert E. Whale wrote:
>
> >Looks more like Sendmail is doing the Lookup. Here's a sample of the logs.
> >
> >Dec 15 12:06:11 access2 sendmail[2953]: gBDJIOuj002074:
> >to=<debra134 at kebi.com>, delay=1+21:23:24, xdelay=00:00:00,
> >mailer=esmtp, pri=4262908, relay=kebi.com., dsn=4.0.0,
> >stat=Deferred: Name server: kebi.com.: host name lookup failure
> >Dec 15 13:09:17 access2 sendmail[5436]: gBDJIOui002074:
> >to=<suzanne8004 at kebi.com>, delay=1+22:26:30, xdelay=00:00:56,
> >mailer=esmtp, pri=4352763, relay=kebi.com., dsn=4.0.0,
> >stat=Deferred: Name server: kebi.com.: host name lookup failure
> >
> >
> This is sendmail (or the server it's on) not being able to resolve
> kebi.com. What happened here (in order) is:
>
> - someone at @kebi.com sent you a message with a virus attached.
> - MD successfully identified this and blocked the message
> - MD also attempted to notify the sender at kebi.com that their
> message had a virus in it
> - MD passed it's notification message back to sendmail for delivery
> - sendmail was unable to resolve kebi.com and kept trying for a
> while (couple of days)
> - sendmail eventually gave up and dropped the message back in
> postmaster at yourdomain (or root at yourdomain)
>
> When I lookup kebi.com, I get a round robin answer containing 10
> different IPs. If your mail server can't resolve the address, I'd say
> you need to look at your DNS server and find out why it can't resolve
> that address. It could be a simple case of it not allowing sendmail to
> communicate with it...who knows.
>
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--
Albert E. Whale - CISSP
http://www.abs-comptech.com
----------------------------------------------------------------------
ABS Computer Technology, Inc. - ESM, Computer & Networking Specialists
Sr. Security, Network, and Systems Consultant
Board of Directors - InfraGard - Pittsburgh, PA
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