The enemy in the network card
From http://www.h-online.com/security/new...d-1141556.html
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Security expert Guillaume Delugré, who works for the Sogeti European Security Expertise Center (ESEC), has demonstrated that a rootkit doesn't necessarily have to infest a computer. The expert used freely available tools and documentation to develop custom firmware for Broadcom's NetExtreme network controller. He was then able to conceal a rootkit within the firmware, making it untraceable by the virus scanners usually installed on a PC.
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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