RE: Exhange 2003

From: Bowden, Sean (sean.bowden@cendian.com)
Date: Fri Mar 05 2004 - 18:43:03 EST

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We have Exchange 2003 in our dmz and had to disable the fixup for smtp and ils.

no fixup protocol ils
no fixup protocol smtp

________________________________

From: Zach Forsyth [mailto:Zach.Forsyth@kiandra.com]
Sent: Thu 3/4/2004 5:04 PM
To: pen-test@securityfocus.com
Subject: RE: Exhange 2003

Is the PIX smtp fixup protocol enabled?
I have seen some very weird things when investigating network issue and
there is a PIX with smtp fixup somewhere in between.
If it is enabled, then do a couple of tests with it switched off.

Just a thought.

Cheers

Zach

> -----Original Message-----
> From: John Swope [mailto:johns@akorn.net]
> Sent: Thursday, 4 March 2004 16:09 PM
> To: pen-test@securityfocus.com
> Subject: RE: Exhange 2003
>
> All,
>
> I work for an enterprise email security company and saw
> something rather odd just the other day and this might be related.
>
> I was troubleshooting a customer's mail environment, they
> were an Exchange shop and our appliance is Unix based. I was
> noticing a 5 second delay between when I telnetted to port 25
> and when the Exchange server actually presented it's 220 banner.
>
> Odd, hosts were connected via 100 Base-T, exchange server was
> not overloaded. No lost packets. What gives...
>
> Ran tcpdump -X -s1600 host exchange.customer.com
>
>
> Notice, no restriction on ports or types of traffic just on host...
>
>
> I noticed the Exchange server was performing 3 NBT broadcasts
> to try to resolve the LMHOST name of my box. Naturally it
> did not work because I'm a Unix box not running Samba.
>
> So, could the exchange server in your case be doing the same?
> Would it explain the results? Is the PIX allowing all
> traffic from Exchange to external network? I realize that I
> was seeing broadcast traffic and one of the posts in the
> thread mentioned the boxes are separated by a PIX, just
> throwing this in as something worth checking...
>
> HTH,
> BJ
>
> At 05:45 AM 03/03/04, Deniz CEVIK wrote:
>
> > Hi all,
> >
> >This host is behind the cisco pix firewall. I have scanned this host
> >using several portscan tools. These tools show that only two
> ports are
> >open. (SMTP and POP3). Strange think is, if you don't
> establish the TCP
> >connection to one of these open ports, before run the
> "nbtstat" command, you get nothing.
> >But if you open a tcp connection and after that run nbtstat command,
> >you can see the details of netbios information of machine.
> >
> >Nbtstat command is sending packets to udp 137 port of
> destination. As
> >far as I see, firewall is accepting udp packets, if there is an
> >established tcp connection from same source to same
> destination as in
> >udp connection request. I think there is a configuration
> problem in the customer firewall.
> >For further analysis I requested firewall configuration and logs.
> >
> >Thanks for your helps.
> >
> >PS: HADXM is the hostname of the machine. I have modified some
> >information in outputs before I posted the message.
> >
> >BR.
> >
> >
> >-----Original Message-----
> >From: jamesworld@intelligencia.com
> >[mailto:jamesworld@intelligencia.com]
> >Sent: Wednesday, March 03, 2004 4:17 AM
> >To: Deniz CEVIK
> >Cc: pen-test@securityfocus.com
> >Subject: Re: Exhange 2003
> >
> >Did you try
> >
> >netstat -an
> >
> >And see what ports were listening?
> >
> >Is there a local IP filtering policy active? You mentioned
> only 2 ports
> >as being active 25 and 100. Perhaps there is a local IP policy only
> >allowing those ports. Perhaps the port 100 was supposed to
> be port 110
> >for POP3 mail access and they typod the entry. Good of you to find
> >their misconfiguration for them :-)
> >
> >Did you run fport (foundstone)? If you've never used fport,
> you should
> >add it to your arsenal.
> >
> >Hopefully HADXM is the username that you are using. If not,
> look into
> >the host being compromised.
> >
> >If you have more, post it to us.
> >
> >Cheers,
> >-James
> >
> >At 08:29 03/02/2004, Deniz CEVIK wrote:
> > >Hi All,
> > >
> > >While we are testing our customer network, we faced with
> strange problem.
> >We
> > >are testing exchange 2003 server externally. When we
> controlled open
> > >services with port scan, I saw that only two ports (25 and
> 100) are
> > >shown
> >as
> > >open. Before I run the portscan, I have controlled the server with
> >"nbtstat"
> > >command of windows. It returned error messages as below.
> > >
> > >nbtstat -A EXCH_IP
> > >
> > >Local Area Connection:
> > >Node IpAddress: [MY_MACHINE] Scope Id: []
> > >
> > > Host not found.
> > >
> > >After the port scan is finished, in order to see the banner
> > >information of mail server, I opened the connection to
> port 25 using
> > >telnet command
> >(telnet
> > >EXCH_IP 25). Same time when I run "nbtstat -A" command
> from another
> > >window by mistake and I saw that below output.
> > >
> > >nbtstat -A EXCH_IP
> > >
> > >Local Area Connection:
> > >Node IpAddress: [MY_MACHINE] Scope Id: []
> > >
> > > NetBIOS Remote Machine Name Table
> > >
> > > Name Type Status
> > > ---------------------------------------------
> > > HADXM <1F> UNIQUE Registered
> > > HADXM <00> UNIQUE Registered
> > > HADXM <20> UNIQUE Registered
> > > EXCHANGE <00> GROUP Registered
> > > EXCHANGE <1C> GROUP Registered
> > > EXCHANGE <1B> UNIQUE Registered
> > > EXCHANGE <1E> GROUP Registered
> > > HADXM <03> UNIQUE Registered
> > > ADMINISTRATOR <03> UNIQUE Registered
> > > EXCHANGE <1D> UNIQUE Registered
> > > ..__MSBROWSE__. <01> GROUP Registered
> > > HADXM <6A> UNIQUE Registered
> > > HADXM <87> UNIQUE Registered
> > >
> > > MAC Address = MAC_ADDRESS_OF_EXCHANGE
> > >
> > >If there isn't any connection to open port of the server you can't
> > >see this nbtstat outputs.
> > >
> > >Has any body faced with same situations before?
> > >
> > >BR
> > >
> > >
> >
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