RE: Server publishing

To add to the previous (and excellent) points of Shawn and The Good Doctor,
I would *highly* recommend considering populating the DMZ with it's own SQL
server (with proper licensing, or course.)

Any leveraging of SQL injection-type attacks would afford an attacker the
luxury of executing code on a box within your internal network.  Further,
from an authentication standpoint, I would imagine that your internal SQL
box (assuming MS sql) would have to be configured to accept Mixed-mode
authentication (with the ADODB connection strings containing user
credentials) -- a far weaker authentication model than NT-based
authentication -- that or (heaven forbid) you've got shared domain
membership between the DMZ web server's IUSR account for the internal SQL
box to accommodate authentication of the web application's requests for
data.  In either case, a compromise of the web server would give an attacker
credentials that could be used on your internal network, as well as a direct
path (1433) into your network.

A DMZ-based SQL box could be locked down, and the internal box could utilize
one-way transactional replication to the DMZ.  In this model, there is no
static port open to the internal network, there are no shared credentials
(the internal box's replication push would use creds on the DMZ box and not
the other way around) and any compromise would leave the attacker in the
DMZ.  Further, the available data on the DMZ box would be limited to that
required by the application.  My bet is that your internal SQL box has data
above and beyond that required by the web app.

Just a thought.

t

----- Original Message ----- 
From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Thursday, July 01, 2004 12:24 PM
Subject: [isalist] RE: Server publishing


http://www.ISAserver.org

Hi Shawn,

Good point. With the SQL publishing scenario, the ISA firewall isn't
providing any security (just like the pix).

However, if there are services behind the ISA firewall that are exposed
to app layer filtering, I'd keep the dual homed ISA box where it is.

Tom
www.isaserver.org/shinder
Get the book!
Tom and Deb Shinder's Configuring ISA Server 2004
http://tinyurl.com/3xqb7
MVP -- ISA Firewalls



-----Original Message-----
From: Quillman Shawn (RBNA/CSA1) * [mailto:Shawn.Quillman@xxxxxxxxxxxx]
Sent: Thursday, July 01, 2004 2:11 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Server publishing


http://www.ISAserver.org


Yes.  The only time you can have 1 adapter is when ISA is in cache-only
mode in which situation you can only web publish.  The config you show
doesn't really make sense, the ISA would be redundant.  You would just
publish the SQL server via the internal PIX.  What is it you're trying
to accomplish with the ISA?

-Shawn


-----
Shawn R. Quillman
Robert Bosch Corporation RBNA/CSA1
38000 Hills Tech Drive
Farmington Hills, MI 48331
(248) 553-1164 (P) (248) 848-6969 (F)
shawn.quillman@xxxxxxxxxxxx

-----Original Message-----
From: nathan [mailto:ncasey@xxxxxxxxxxxxxxxxx]
Sent: Thursday, July 01, 2004 3:40 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Server publishing

http://www.ISAserver.org

With server publishing, if I publish a SQL server that sits on the
internal network, does my ISA server need 2 adapters? The SQL server is
acting as a back-end database server for a Web site which is hosted on
web server in a PIX DMZ.
If I do need 2 adapters for server publishing can they both reside in
PIX DMZ's? My network security guy wants all incoming traffic to go
trough the PIX firewall

Internet Router
   (Public IP)
|
|
PIX FIREWALL
|
|
  Web server
|
|
PIX FIREWALL
*internal Network*
|
|
ISA SERVER
|
|
SQL SERVER

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