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Promiscuous-mode sniffing backdoor

For the promiscuous-mode sniffing backdoor, won't all back-door traffic look like it's coming from the compromised machine?

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No, because the backdoor can send its responses using spoofed messages. Therefore, all data looks like it's going to and coming from the address of the system without the sniffer. In fact, the sniffer is grabbing the traffic for the backdoor, and the backdoor is spoofing its replies.

For more information on this topic, visit these other resources:
Webcast archive: Keeping the bad guys out -- defensive strategies revisited, with Ed Skoudis

This was first published in July 2002

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