Firewall Wizards mailing list archives
PIX -> ISA -> OWA Configuration
From: woodsd001 () hawaii rr com
Date: Wed, 04 May 2005 11:02:34 -1000
Option #1 would have to be the worst option for security, all you have to do is re-read Ben Nagy's response and think about it for a few more minutes. When you place the OWA server directly into your internal network without controls, you have no controls unless of course you truely believe that a Microsoft product is not considered a "Hackable device" and in this case we are talking about two Microsoft products - ISA Proxy Server and OWA..... [spaghetti] --> [hackable box] --> [hackable box] --> [pot of gold] Option #2 is the better solution since there is atleast on additional contol added in the diagram. -----Original Message----- Subject: Re: [fw-wiz] PIX -> ISA -> OWA Configuration Definitely. In #1, if the ISA server is configured via the OWA publishing wizard, it will create ACL's that prevent requests that don't match /exchange/* from being passed to IIS. You can also run urlscan at the ISA server (though it requires some tweaking to keep from breaking some of OWA's functionality). In #2, the same thing applies, but should the ISA server be compromised say via buffer overflow, then there is no protection for the internal AD domain, since those holes must be punched straight through the firewall (and they are BIG holes). PaulM -----Original Message----- Subject: Re: [fw-wiz] PIX -> ISA -> OWA Configuration Definitely? Under #1 it seems like something as simple as a directory traversal attack against IIS/OWA that manages to get through ISA leaves your entire internal network exposed. Under #2 it appears to me that an attacker would need at the very least a second exploit to gain further access to the trusted network.
-----Original Message----- What is the preferred placement for a OWA front-end server given these two possible network configurations and why? 1) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [PIX Firewall] <==> [OWA] <==> [Internal Net w/Exchange Svr] 2) [Internet] <==> [PIX Firewall] <==> [ISA Proxy] <==> [OWA] <==> [PIX Firewall] <==> [Internal Net w/Exchange Svr]
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Current thread:
- Re: PIX -> ISA -> OWA Configuration, (continued)
- Re: PIX -> ISA -> OWA Configuration Danny (May 05)
- Re: PIX -> ISA -> OWA Configuration Jason Gomes (May 03)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 03)
- Re: PIX -> ISA -> OWA Configuration Kevin (May 05)
- Re: PIX -> ISA -> OWA Configuration Jason Gomes (May 05)
- RE: PIX -> ISA -> OWA Configuration Frank Knobbe (May 05)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 03)
- RE: PIX -> ISA -> OWA Configuration Thomas W Shinder (May 05)
- FW: PIX -> ISA -> OWA Configuration Paul Melson (May 05)
- RE: PIX -> ISA -> OWA Configuration Sanford Reed (May 05)
- Re: PIX -> ISA -> OWA Configuration Jason Gomes (May 05)
- PIX -> ISA -> OWA Configuration woodsd001 (May 05)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 05)
- Re: PIX -> ISA -> OWA Configuration Michael Brown (May 08)
- RE: PIX -> ISA -> OWA Configuration Mark Tinberg (May 08)
- Re: PIX -> ISA -> OWA Configuration Victor Williams (May 08)
- Re: PIX -> ISA -> OWA Configuration Chris Blask (May 12)
- RE: PIX -> ISA -> OWA Configuration Paul Melson (May 05)
- Message not available
- RE: PIX -> ISA -> OWA Configuration Chris Blask (May 17)
- Re: PIX -> ISA -> OWA Configuration Victor Williams (May 18)