ARP Poisoning & Man-in-the-Middle Attacks 🕵️‍♂️

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Disclaimer
Before we start, I need to stress that this video is for informational purposes only. If you know how these attacks work, then you can better defend against them. Do not try this on any system that you do not own or have permission to do so.

ARP, or Address Resolution Protocol, is used to discover MAC addresses and map them to an associated IP address.

The way this works is very simple. A host broadcasts a message to the entire network asking for the correct MAC address.

Computers are very trusting of the ARP messages they receive, and this can cause problems. If an evil attacker sends a specially crafted ARP message (gratuitous ARP) the attack can pretend to be someone they are not.

The good news is that these types of attacks are not as effective as they used to be. Most of the traffic we send is now encrypted so the bad guys will struggle to get anything useful.