Many modern exploits, viruses, and
???scumware,??? such as illegal file-sharing applications, piggy-back off the TCP 80 HTTP port,
for example. Using the border guard analogy to illustrate, the smugglers realized that if
they put their contraband in the luggage of a citizen from a country on the border guard??™s
allowed list, they could smuggle it into the country without worrying that the guard
would inspect the package. These types of exploits and attacks are not uncommon, and
the list of known Application-level attacks continues to grow.
In the past, when an organization realized that it had been compromised through its
traditional packet-filter firewall, the common knee-jerk reaction was to lock down access
from the Internet in response to threats. For example, an exploit that would arrive over
HTTP port 80 might prompt an organization to completely close access to that port for a
temporary or semipermanent basis. This approach can greatly impact productivity, especially
in a modern connected infrastructure that relies heavily on communications and
collaboration with outside vendors and customers. Traditional security techniques
involved a trade-off between security and productivity.
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