While firewalls are a critical part of today's externally-connected networks, their weaknesses have been revealed time and time again. Some of the world's most widely implemented firewall systems, including Check Point's FireWall-1, Cisco's PIX, NAI's Gauntlet, and Axent's Raptor, have had serious vulnerabilities exposed in recent history, and all of these could be exploited remotely by a malicious party in order to gain access to the backend systems. These vulnerabilities were able to exist because of three fundamental design flaws that all firewalls have: a) they all speak TCP/IP, a protocol fraught with inherent vulnerabilities; b) they all connect both the DMZ and internal network in the same way that a router does; and c) holes must be created to allow network traffic to flow through to the inside.
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