Hack Open Hotel, Airplane & Coffee Shop Wi-Fi with MAC Address Spoofing.

After finding and monitoring nearby wireless access points and devices connected to them, hackers can use this information to bypass some types of security, like the kind used for Wi-Fi hotspots in coffee shops, hotels, and in flights high above the ground. By swapping their MAC address for that of someone already connected, a hacker can bypass the MAC filter and connect freely.

Password-free networks are common in public spaces, allowing anyone to initially join the network without needing to know a secret password. You've likely encountered them at Starbucks, hotel rooms, and on flights featuring in-flight Wi-Fi. All of these networks will have a login portal or payments page users will be continuously redirected to before they can connect directly to the internet.

Defending Against MAC Spoofing:

Since MAC addresses can be spoofed so easily, it's generally not advised to use it for any application that requires real security. While MAC address filtering can prevent an unskilled attacker from connecting a device, anyone with basic knowledge of wireless recon would find it trivial to bypass such a network restriction.

It's far more secure to require a password to connect and restrict a user to their own subnet, rather than maintaining an open network with a captive portal using MAC address filtering.

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