Are Proxy Firewalls a Security Hole?

[Dav Fisher <dfisher3202 () gmail com>]

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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