RES: Need your help!!!

["Pastinha" <pastinha () terra com br>]

You have to block SMTP relaying on the SMTP Virtual Server Properties!!
The easiest way would be to permit connections only foryour IP ranges!
Don't worry, it's very simple.

Good Luck.
Patricia Viana.

-----Mensagem original-----
De: Birl [mailto:sbirl () temple edu] 
Enviada em: segunda-feira, 22 de setembro de 2003 13:54
Para: security-basics () securityfocus com
Assunto: Re: Need your help!!!


As it was written on Sep 20, thus chang zhu typed:

Chang:  Date: Sat, 20 Sep 2003 08:19:39 -0700 (PDT)
Chang:  From: chang zhu <cyz2000 () yahoo com>
Chang:
Chang:  Hi, all
Chang:
Chang:  Some people connect to my exchange 2000 server every
Chang:  day and sent all spams out.  When I go to current
Chang:  sessions under SMTP protols and default SMTP virtual
Chang:  server from exchange system manager, I can see these
Chang:  people's connections and IP address (no domain name
Chang:  shown up and only fake name and IP shows).  I do not
Chang:  know how to block them.


Ummm ... a firewall?


Chang:  This is exchange 2000 server
Chang:  with SP3 and behind PIX firewall.  We only open port
Chang:  25, 443 and 80 for this exch 2k server on PIX. MX
Chang:  reocrd points to this server. If I use NMAP
Chang:  to scan this box internally, here are ports open:
Chang:
Chang:
Chang:  25/tcp     open        smtp
Chang:  80/tcp     open        http
Chang:  110/tcp    open        pop-3
Chang:  119/tcp    open        nntp
Chang:  135/tcp    open        loc-srv
Chang:  139/tcp    open        netbios-ssn
Chang:  143/tcp    open        imap2
Chang:  443/tcp    open        https
Chang:  445/tcp    open        microsoft-ds
Chang:  563/tcp    open        snews
Chang:  593/tcp    open        http-rpc-epmap
Chang:  691/tcp    open        resvc
Chang:  993/tcp    open        imaps
Chang:  995/tcp    open        pop3s
Chang:  3372/tcp   open        msdtc
Chang:  3389/tcp   open        ms-term-serv
Chang:  6000/tcp   open        X11
Chang:  6001/tcp   open        X11:1
Chang:  6003/tcp   open        X11:3
Chang:  6005/tcp   open        X11:5
Chang:  7001/tcp   open        afs3-callback
Chang:  8081/tcp   open        blackice-icecap
Chang:
Chang:  x11?


X11 is X-windows.  More-or-less windows for a UNIX machine.
But since you're running Windoze, Im not sure what's listening on TCP
600[0-1,3,5]

Recommend you get nmap 3.45 and run it with the newly added -sV flag to
see what's listening.  Moreover, you should download TCPView and leave
it running.



(and you should make sure that your lines below dont word-wrap)

Chang:  When I do netstat -na, the followings shown on the part of
result;
Chang:
Chang:  TCP    127.0.0.1:25           127.0.0.1:54441        TIME_WAIT
Chang:  TCP    127.0.0.1:25           127.0.0.1:54898        TIME_WAIT
Chang:  TCP    127.0.0.1:25           127.0.0.1:54904        TIME_WAIT
Chang:  TCP    127.0.0.1:25           127.0.0.1:54914        TIME_WAIT
Chang:  TCP    127.0.0.1:25           127.0.0.1:54916        TIME_WAIT
Chang:  TCP    127.0.0.1:25           127.0.0.1:54988        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54433        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54434        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54442        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54443        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54444        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54445        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54446        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54454        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54890        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54893        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54903        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54911        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54913        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54915        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54917        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54918        TIME_WAIT
Chang:  TCP    127.0.0.2:25           127.0.0.2:54919        TIME_WAIT
Chang:  TCP    127.0.0.100:25         127.0.0.100:54905      TIME_WAIT
Chang:  TCP    127.0.0.100:25         127.0.0.100:54912      TIME_WAIT
Chang:  TCP    127.0.1.50:25          127.0.1.50:54456       TIME_WAIT
Chang:
Chang:  THis server is not an open relay server and how
Chang:  spammers can connect this server to send all spams out
Chang:  from different domain address?
Chang:
Chang:  Due to limited experience, I am not able to tackle it
Chang:  down.  Many anti-spam company put our sever on their
Chang:  lists.  I ask them to send me report that indicated
Chang:  all spams truly went out through my server from mail
Chang:  header info.
Chang:
Chang:  I need to resolve this ASAP and any suggestion or
Chang:  solutions will be greatly appreciated.
Chang:
Chang:
Chang:  Thanks for all your attention and help,


These are all internal IPs.  Do you know if these IPs are actually in
use, or do you think they are forged?  I see you mentioned "... fake
name and IP ..." but I do not see any "fake" names



Thanks

 Scott Birl
http://concept.temple.edu/sysadmin/
 Senior Systems Administrator            Computer Services   Temple
University
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