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Network Security Firewalls
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PIX -> ISA -> OWA Configuration

from [Kaneleka] Network Security [Permanent Link]
Subject: PIX -> ISA -> OWA Configuration
Date: 26 Apr 2005 06:20:47 -0000 


The following question is directed at experienced professionals with experience 
in the components listed under this subject heading.
What is the preferred placement for a OWA front-end server given these two 
possible scenarios..

1) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [PIX Firewall] <==> 
[OWA] <==> [Internal w/Exchange Svr]

2) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [OWA] <==> [PIX 
Firewall] <==> [Internal w/Exchange Svr]

Notes:
The ISA server is performing a reverse proxy for HTTPS connections originating 
from the Internet.

I am concerned with scenario #1 in that if OWA is compromised through HTTPS, 
the attacker would have full access to the Internal network, whereas in 
scenario #2 the ports and servers that OWA is allowed to communicate can be 
restricted further using the backend PIX firewall.


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