Define Perimeter

Its surprising to us that people still define their network perimeter by their firewall, which is often the perceived demarcation point between the Internet and the Local Area Network (LAN).  The fact of the matter is that the real demarcation point has nothing to do with the firewall at all.   In fact these days the real demarcation point has more to do with the human element (you) than with technology in general.

I bring this up because the issue surfaces during penetration testing engagements frequently.  Specifically, customers want penetration testing services against their perimeter but they don’t actually know what their perimeter is.  Once we explain it to them their perspective on what a penetration test is changes significantly and for ever.  Their perimeter is defined by any point that is accessible to an Internet based attacker, but what does that really mean?

Clearly firewalls, web servers, email servers, ftp servers, etc. are accessible to an Internet based attacker.  But what about all of those services that businesses use on a daily basis that reach out to the Internet to collect data.  What about what you are doing right now?  You are […]