Basically the ARP protocol is used to translate IP addresses to MAC addresses and NetCut exploits the weakness in the stateless ARP protocol due to the lack of authentication. NetCut is very easy to use and can be used by anyone. Simply run the tool and it will detect all the connected devices in the same local area network. You can then select any target from the list followed by clicking the “Cut off” button, and within seconds the target will lose its internet connection. The affected target will have no idea what’s happened even if he/she has a firewall program installed.ĭue to the way NetCut works, no firewall is able to prevent nor even detect the attack. In fact setting up static ARP entries like most other websites suggested will not protect you against NetCut attacks because NetCut directly attacks the gateway and not the user.
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Here is an investigation on how NetCut works and also the method to protect against the DoS attack.Īs we’ve mentioned earlier, none of the firewall software such as ZoneAlarm, Comodo, Outpost, GlassWire, SpyShelter, Privatefirewall, and etc is able to detect NetCut attack. However you can use XArp, which is a freeware tool that can detect ARP spoofing. By installing XArp and running it, you will be instantly notified when it detects an ARP spoofing attack including the attack from NetCut. The screenshot below shows a running XArp without attacks.
Take note of the MAC address 00-21-5d-41-16-5a circled in red which is associated with the IP 192.168.2.8. When NetCut starts attacking the IP 192.168.2.8 in an attempt to cut off the Internet connection, XArp immediately detects it and shows an alert popup with a few different messages. The most important message would be the one that reports that the MAC address for the IP 192.168.2.8 has been changed from 00-21-5d-41-16-5a to 03-27-75-49-18-73. If you launch the XArp program from the notification tray icon, you will see that the MAC address for the IP 192.168.2.8 has been changed to 03-27-75-49-18-73 which is obviously wrong. This means that NetCut sends a spoofed packet to inform the gateway that the IP 192.168.2.8 is associated with an incorrect MAC address. Since the IP 192.168.2.8 isn’t mapped to the correct MAC address, the Internet connection breaks as well.
Even a packet sniffer such as Wireshark confirms that spoofed packets are sent to the gateway with a wrong MAC address mapped to the IP 192.168.2.8. When NetCut is actively attacking a target on the network, it will continuously send spoofed packets to the gateway so that there is no chance for the gateway to obtain the correct dynamic ARP table. Here we have 5 possible ways of protecting against NetCut attacks. Since NetCut sends spoofed packets to the router to mess with the dynamic ARP table, you can solve this problem by setting up a static ARP table in the router. Implementing static ARP routing will protect everyone that is connected to the network. However this is not really a solution for everyone because a lot of basic home based routers don’t support static ARP table and it doesn’t make sense to implement this on a public WiFi. Doing this on a large corporate network also requires a lot of manpower maintaining the IP to MAC address mappings.
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