Re: Are Proxy Firewalls a Security Hole?

["Rob" <synja () synfulvisions com>]

I wouldn't classify a limitation as a security hole. That's like declaring that antivirus technology is useless because 
there are cryptors that are currently undetectable.

When you design your security model, you need to account for every likely scenario and do a basic cost benefit analysis 
of what each device/application will provide you.

A $20k appliance that doesn't give you at least $20k worth of benefit has no place on your network. Proxies can filter 
many common attacks out, but the real test is always client side; have you comparmentalized application permissions and 
ensured that any compromise is limited in scope?

It's not as simple as prevention, you also have to account for mitigation, containment, and recovery.

Rob
Sent on the Sprint® Now Network from my BlackBerry®

-----Original Message-----
From: Dav Fisher <dfisher3202 () gmail com>
Sender: listbounce () securityfocus com
Date: Thu, 31 May 2012 15:54:58 
To: <security-basics () securityfocus com>
Subject: Are Proxy Firewalls a Security Hole?

Given that people are sending larger and larger files, proxy firewalls
seem to be limited since they can't inspect files after a certain
point and the 'stream', 'flow', 'express' AV options of many of the
proxy firewall vendors inspect only a portion of the large file. I've
been able to put the Eicar virus in different locations of a large
test file and successfully get the file through the firewall.

So, are proxy firewalls a security hole?

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