Hacker 'handshake' hole found in common firewalls

"Some of the most commonly-used firewalls are subject to a hacker exploit that lets an attacker trick a firewall and get into an internal network as a trusted IP connection.

NSS Labs recently tested half a dozen network firewalls to evaluate security weaknesses, and all but one of them was found to be vulnerable to a type of attack called the "TCP Split Handshake Attack" that lets a hacker remotely fool the firewall into thinking an IP connection is a trusted one behind the firewall."

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