What is the MITM (Man in The Middle) Attack using ARP Poisoning?

A Man-in-the-Middle (MITM) attack is a cyber attack where an attacker secretly intercepts and potentially alters communications between two parties who believe they are communicating directly with each other. This allows the attacker to eavesdrop on conversations, steal sensitive information, or manipulate the data being exchanged.

In MITM attacks, the attacker positions themselves between the victim and their intended communication target, creating a scenario where all traffic flows through the attacker's system. This enables them to capture passwords, session tokens, personal data, and other sensitive information without the victims' knowledge.

ARP Poisoning Attack

ARP (Address Resolution Protocol) poisoning is one of the most common methods used to execute MITM attacks on local networks. ARP is used to map IP addresses to physical MAC addresses within a local area network. When a device needs to communicate with another device, it checks its ARP cache to find the corresponding MAC address for the target IP address.

How ARP Poisoning Works

The attack follows these steps:

• ARP Cache Poisoning − The attacker sends fake ARP responses to both victims, claiming to own the IP address of the other party.

• Traffic Redirection − Both victims update their ARP caches with the attacker's MAC address, causing all traffic to flow through the attacker's machine.

• Data Interception − The attacker can now capture, analyze, or modify all communications between the two victims.

• Traffic Forwarding − To maintain the illusion of normal communication, the attacker forwards the traffic to its intended destination.

Other MITM Attack Types

Rogue Access Point

Attackers set up fake wireless access points with strong signals to trick nearby devices into connecting automatically. Once connected, all traffic passes through the attacker's network, allowing complete monitoring and manipulation of data.

mDNS Spoofing

Multicast DNS spoofing targets local network name resolution. When devices query for local services (like printers or smart TVs), attackers respond with fake records pointing to their controlled addresses, redirecting traffic through their systems.

Prevention Measures

Conclusion

MITM attacks using ARP poisoning exploit the trust-based nature of local network protocols to intercept communications. Understanding these attack vectors and implementing proper security measures like encryption and network monitoring are essential for protecting against such threats.