Another scenario is when a hacker will add a small surveillance device or camera to a public Wi-Fi network which, by itself, would not have the ability to authenticate through a portal the way some open networks require to connect.
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A simple command line tool like GNU MAC Changer is then able to swap out the hacker's MAC address for one discovered to already be connected, allowing them to connect to the network disguised as the trusted, authorized device, granting them the same level of access.Īfter successfully spoofing the MAC address, the hacker can obtain network access without authentication or even paying a fee. Hacking class: Students using Kismet and external wireless cards to scan for Wi-Fi devices. This clearly reveals the MAC address of any device exchanging data with a network, which is an indication that it has already authenticated successfully.ĭon't Miss: Getting Started with the Aircrack-Ng Suite of Wi-Fi Hacking Tools Taking Advantage of This Security Loopholeīy simply scanning the local area with tools like Kismet or Airodump-ng, a hacker can easily see every open Wi-Fi network nearby, as well as any clients connected to it. A MAC address is supposed to be a unique address set by the manufacturer to identify a piece of hardware to a network and to other devices, but in practice, assuming the MAC address is always truthful isn't a good idea. Fortunately for a hacker, it is also exceedingly easy to change or spoof the MAC address of a Wi-Fi device. There currently aren't many ways besides MAC addresses for a Wi-Fi access point to differentiate between wireless devices trying to join the network.
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These devices have already either accepted the terms of service, paid, or otherwise gone through the process needed to register them with the network's MAC filter, and they are free to access the internet without needing to go through the portal again for a period of time.ĭon't Miss: How to Create an Evil Twin Wireless Access Point to Eavesdrop on Data These public wireless networks manage their security by having a secret "white list" of MAC addresses belonging to devices which have already gone through the authentication process. Routers can allow or prevent devices from accessing the internet based on its MAC address alone. In order to connect to one of these public hotspots, or any router, a device's MAC address is needed to assign the device an IP address when attempting to connect, ensuring that any requests the device makes to load content from the internet are returned back to the correct IP (and MAC) address. How MAC Addresses Play a Key Role in Connecting
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