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http://www.theregister.co.uk/2010/11/23/network_card_rootkit/ 

By John Leyden
The Register
23rd November 2010

Security researchers have demonstrated how it might be possible to place 
backdoor rootkit software on a network card.

Guillaume Delugre, a reverse engineer at French security firm Sogeti 
ESEC, was able to develop proof-of-concept code after studying the 
firmware from Broadcom Ethernet NetExtreme PCI Ethernet cards.

He used publicly available documentations and open source tools to 
develop a firmware debugger. He also reverse-engineered the format of 
the EEPROM where firmware code is stored, as well as the bootstrap 
process of the device.

Using the knowledge gained from this process, Delugr=C3=A9 was able to 
develop custom firmware code and flash the device so that his 
proof-of-concept code ran on the CPU of the network card. The technique 
opens the possibility of planting a stealthy rootkit that lives within 
the network card, an approach that gives potential miscreants several 
advantages over conventional backdoors.

[...]


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