Re: OWA security

[Michael Gale <michael () bluesuperman com>]

Hello,

        I am now M$ expert (thank God) but I believe the ISA server is supposed
to be some form of security and authentication server. So you can have
multiple OWA servers to handle load and such things. Then the ISA server
is like a proxy between exchange, for authentication and security.

I think.

Michael.




On Tue, 13 Jan 2004 13:13:32 -0500
"Kollman, Christopher" <Christopher.Kollman () phlx com> wrote:

> A question and small note. What is the purpose of the ISA server and
> why is it connected to the internal network and the DMZ. Any requests
> should route through the PIX server. The port 80 internal rule should
> only allow outbound access to the webserver from the internal network,
> so the exposure is not as great as the inbound access from the
> Internet to the web server. 
>
> -----Original Message-----
> From: Martin K. Lee - XML Consulting
> [mailto:martin.lee () xmlconsulting com au]
> Sent: Monday, January 12, 2004 9:47 PM
> To: Beverly Kittens
> Cc: security-basics () securityfocus com
> Subject: RE: OWA security
>
>
>
> Hi Beverly,
>
> If you are serious about security you shouldn't use HTTP for OWA
> access in the first place. HTTPS would help in this case (Well be
> aware of DoS though).
>
> Well if you are adding a separate web server into the network, I would
> suggest a firewall for separating the web server and the internal
> network. You may like to consider removing the connection of the PIX
> to the internal network and make a DMZ for the web server.
>
> My 2 cents...
>
> Martin K. Lee
>
> -----Original Message-----
> From: Beverly Kittens [mailto:beverlykittens () hotmail com] 
> Sent: Wednesday, December 17, 2003 12:43 AM
> To: MDunn () sscincorporated com
> Cc: security-basics () securityfocus com
> Subject: RE: OWA security
>
>
>
> Thanks Mike
>
> In fact we are using and ISA server.  Proposed config looks like this.
>
> Internet
>     |
> +------+             +------------------+
> | PIX  |-----+----- | OWA Server |
> +------+     |       +------------------+
>    |           |
>    |     +---------------+
>    |     | ISA Server |
>    |     +---------------+
>    |           |
> ----------------------------+---
> internal network      |
>                     +----------------------+
>                     | Xchange server |
>                     +----------------------+
>
> I'm trying to determine if this is a sensible architecture, and I'm
> still 
> rather unclear about the function of the ISA server in this context.
>
> On a somewhat related topic:  What stops an attacker compromising the
> web 
> server then using it to attack an internal system?  Port 80 is open
> from the 
> Internet to the web server, and from the web server to the internal
> systems. 
>   Isn't this a huge security hole?
>
>
> > From: "Michael Dunn" <MDunn () sscincorporated com>
> > To: "Beverly Kittens" <beverlykittens () hotmail com>
> > CC: <security-basics () securityfocus com>
> > Subject: RE: OWA security
> > Date: Mon, 15 Dec 2003 14:38:40 -0500
> >
> >
> > Check out isaserver.org.
> >
> > You may or may not be using ISA server as your firewall, but in
> > either case, there are several articles on 'best practices' for
> > securing an IIS/OWA server.
> >
> > Regards,
> >
> > -Mike
> >
> > -----Original Message-----
> > From: Beverly Kittens [mailto:beverlykittens () hotmail com]
> > Sent: Monday, December 15, 2003 10:32 AM
> > To: security-basics () securityfocus com
> > Subject: OWA security
> >
> >
> >
> > Hello list
> >
> > My company is currently implementing OWA to provide users with access
> >
> > to email from any Internet machine.  I'd like to see the OWA server
> > in a DMZ, but this is currently up for discussion.  Sometimes
> > operational stuff gets in the way of security....
> >
> > Can anyone point me at a paper that describes the security
> > implications
>
> > of OWA, particularly the network related issues please.  I'd also be 
> > interested to learn the difference between OWA and POP architecture.
> >
> > Thank you
> >
> > _________________________________________________________________
> > Use MSN Messenger to send music and pics to your friends 
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-- 
Hand over the Slackware CD's and back AWAY from the computer, your geek
rights have been revoked !!!

Michael Gale
Slackware user :)
Bluesuperman.com 

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