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RE: Spamming

From: "Franki" <franki () gshop com au>
Date: Fri, 5 Oct 2001 02:53:38 +0800
yup, and postfix has many many ways of dealing with span as well...

in fact it had better stats in a recent survey then sendmail or Qmail with
regards
to being spam relays... IE it was like .05% both sendmail and Qmail were
higher...



rgds

Frank

-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net]On Behalf Of Ed Kasky
Sent: Friday, 5 October 2001 2:34 AM
To: snort-users () lists sourceforge net
Subject: RE: [Snort-users] Spamming


I have been watching this thread and have to agree with Jason on this
one.  Sendmail is well equipped to deal with spam from a number of
different directions:

http://www.sendmail.org/antispam.html

One note- "If you're still running 8.8.x and can't upgrade for some reason,
this page should help you. But the recommended way to deal with anti-relay
problems is to upgrade to 8.9.3 or 8.10 ."

At 02:06 PM 10/4/2001 -0400, Jason Robertson wrote:

This sounds more like something that would be better handled by the mail
server.

I know a server like Exim can handle this to a degree.  Or with a router
with ratelimiting(or linux
with the ratelimiting patches), you just give him almost no access, as an
example he can only
send to the server at 2kbps, this would make spam nearly impossible.

On 3 Oct 2001 at 21:39, Roger Bou Aoun wrote:

From:                   "Roger Bou Aoun" <roger.bouaoun () dm net lb>
To:                     "'Chris Keladis'" <Chris.Keladis () cmc cwo net au>
Copies to:              <snort-users () lists sourceforge net>,
<erek () theadamsfamily net>
Subject:                RE: [Snort-users] Spamming
Date sent:              Wed, 3 Oct 2001 21:39:42 +0200


Well you can use IDS to determine a Spam by the traffic generated by a
certain IP I m speaking about Network Based IDS so you can put a
limitation about the traffic generated by these IP'S.

What I want is to control the number of sessions on port 25 SMTP to each
host so I can have control on him, so in case he is spamming he will
fail. I've tried several Anti Spam software I was Satisfied with Mail
Shield, but it do not support this feature

Regards

      ,,,
     /'^'\
    ( o o )
oOOO--(_)--OOOo----------------------

     Roger Bou Aoun
Senior Security Specialist

Data Management - Lebanon
Internet Service Provide
AL Ghazal Tower, 9TH Floor
Tel: + 961 1 337 001   ext 202
Fax: + 961 1 218 889                  Mobile: + 961 3 843 155

                       E-mail: roger.bouaoun () dm net lb
                               security () dm net lb
*************************** End of Message ****************************



-----Original Message-----
From: root () cmc cwo net au [mailto:root () cmc cwo net au] On Behalf Of
Chris Keladis
Sent: Wednesday, October 03, 2001 5:26 PM
To: Erek Adams; Roger Bou Aoun
Cc: snort-users () lists sourceforge net
Subject: Re: [Snort-users] Spamming

Erek Adams wrote:


On Wed, 3 Oct 2001, Roger Bou Aoun wrote:


Ca we stop spamming using snort??? If yes how can it be done, I know
that commercial Intrusion Detection Systems, are able to do it, can

it

be done with the open Source software, or limit the number of

sessions

that each IP can use on a certain port


Roger, how do the commercial IDSs determine a "SPAM" mail? (keyword,
header recognition?)



Some points in no real order:

1)  How do you determine spam?  You must look into the headers for

some info.

That's ALL you should do.  If you go into the 'envlope' you are now

'filtering

based on content'.  That's a Bad Thing(tm) in the mailadmin world.


Well i dont think parsing the envelope headers would be as much of a sin
as parsing the letter headers. (After all, most every MTA needs to parse
the envelope headers to deliver the mail).

Even if you match on the envelope headers, SPAM could still get past
since it could have correct envelope headers (say from a forward or a
redirect), but be a spam internally in the letter headers, and i kind of
agree with you, parsing the content (letter headers) is rather lame,
especialy since letter headers are simply strings of the senders
selection.



Just my .02 worth...  I was a mailadmin in a previous life, so I'm

still

touchy about these kinds of isssues.  :-)


Hehehe.. I hear you there :)

If this feature was seriously needed then i'd say you would need a
dedicated pre-processor, and even then you would have a hell of a time
parsing out the Received: lines since i don't think they need to conform
to any standard,  apart from begin with Received: for each mail-hop.

I really think this is a job more suited to a host-based-ids, to plough
through the logs and raise alerts when the MTA (or front-end) sees SPAM.

Perhaps this is what Roger meant??


On the topic of HIDS - Marty, any plans, or is this a FAQ? :)





Regards,

Chris.






---
Jason Robertson
Network Analyst
jason () ifutureinc com
http://www.astroadvice.com


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