Port 139 is bad!!
An application called SMBRelay, written by cDc's Sir Dystic, exploits a design flaw in the SMB (Server Message Block) protocol on Win NT/2K boxes, easily enabling an attacker to interpose himself between the client and the server.
Read more on the reasons why at the register.
Related Web URL: http://www.theregister.co.uk/content/8/18370.html
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