🟨ARP Spoofing
ARP
• An ARP request message should be placed in a frame and broadcast to all computers on the network
• Each computer receives the request and examines the IP address
• The computer mentioned in the request sends a response; all other computers process and discard the request without sending a response
Gratuitous ARP
• Gratuitous ARP is used by hosts to “announce” their IP address to the local network and avoid duplicate IP addresses on the network; routers and other network hardware may use cache information gained from gratuitous ARPs
• Gratuitous ARP is a broadcast packet (like an ARP request)
HOST W: Hey everyone I’m host W and my IP Address is 1.2.3.4 and my MAC address is 12:34:56:78:9A:BC
ARP Spoofing
arpspoof
example:
1. Enable ip forwarding first
2. tell 172.16.5.1 that if they need to communicate with 172.16.5.23 they must pass from the attacker system
now, in a separate terminal
3. tell 172.16.5.23 that if the need to communicate with 172.16.5.1 they must pass from the pentester system
Ettercap
example:
Bettercap
Refer to Bettercap cheat sheet for full documentation.
specify a number of IP addresses, comma=separated
turn ARP spoof on/off
When the arp.spoof module is started, Bettercap will automatically configure the OS features for the MitM attack (such as turning on IP forwarding on Linux systems)
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