Demonstration - ARP Spoofing to Sniff Telnet Credential (in clear text)

This is a late upload demonstration video i did way back in 2009 about performing ARP spoofing (or ARP poisoning) to sniff unencrypted network traffic between a server and a client device like establishing a telnet session.

ARP spoofing (or ARP poisoning) allows an attacker to intercept traffic on a local area network (LAN) by tricking devices into sending data to the attacker's machine instead of the legitimate gateway. 

Here is why and how it works:

• Plaintext Vulnerability: Telnet is a legacy protocol that transmits all data—including usernames, passwords, and commands—in clear text.

•  Man-in-the-Middle (MitM): By poisoning the ARP cache of both the client and the server, an attacker positions themselves in the middle of the connection.

• Session Sniffing: Once the traffic passes through the attacker's machine, they can use packet sniffers (like Wireshark or dsniff) to read the plaintext Telnet credentials and session data.

• Session Hijacking: Beyond just reading, an attacker can also inject commands or hijack the session entirely. 

How to Protect Your Devices or Your Organization.

• Use SSH: Replace Telnet with SSH, which encrypts the entire session, making captured data useless to an attacker.

• Static ARP Tables: On critical systems, manually map IP addresses to MAC addresses to prevent them from being updated by spoofed packets.

• Network Security: Use tools like Arpwatch or Dynamic ARP Inspection (DAI) on managed switches to detect and block suspicious ARP activity.