Post by nelsonelias on Feb 20, 2024 2:48:25 GMT -5
There are two situations where DHCP is attacked: when the DHCP client workstation is illegal and when the DHCP server is illegal. When the DHCP client workstation is illegal In this case, the compromised client will continuously send IP requests to the server. At this time, the server will automatically allocate IP addresses to unauthenticated clients until there are no more addresses left. This will lead to exhaustion of addresses for legitimate workstations, slowing down the network and many workstations not being able to access the network. This type of attack is simple, easy to perform, only requires bandwidth and does not take much time. When the DHCP server is illegal In case an attacker breaks through the network protection wall, he will be able to control the DHCP server and control the network system. Below are 3 types of attacks when the DHCP server is illegal.
DoS the network system : the attacker will set up an IP range and subnet mask to make the workstation unable to log in to the system, leading to a DoS situation in the network. DNS redirect : by changing DNS, workstations will be led to fake, dangerous websites. These websites may contain malicious code, viruses... that steal user information. Man-in-the-middle : this is an attack where the default port will be changed Loan Phone Number List to the attacker's machine. From there, copy and steal all user information, all information, requests from the Client sent to the default Gateway will go to their computer before returning. With this type of attack, the attacker can only view the content of the information packet sent out on the network. Content sent to client workstations from outside the network cannot be viewed. What are DHCP security solutions? DHCP security is an important step that should not be overlooked DHCP security is an important step that should not be overlooked Depending on the different types of attacks, there are separate, appropriate DHCP security solutions .
Let's take a look at some DHCP security solutions below: With attack using illegal DHCP client For this type of attack, switches with high security capabilities can be used. It helps limit the number of MAC addresses used on a port. This method helps limit work in the same time period. The same port has too many MAC addresses in use. In case the number of addresses exceeds the specified level, the port will be closed, stopped serving and will only operate again according to the time set by the administrator. With Man-in-the-middle attack When encountering a Man-in-the-middle attack, we can use switches with high DHCP snooping security features . This way, DHCP connections will be limited to untrusted ports. Only trusted ports will allow DHCP response packets to operate, and only this port will be allowed by the administrator to connect to the real server.
DoS the network system : the attacker will set up an IP range and subnet mask to make the workstation unable to log in to the system, leading to a DoS situation in the network. DNS redirect : by changing DNS, workstations will be led to fake, dangerous websites. These websites may contain malicious code, viruses... that steal user information. Man-in-the-middle : this is an attack where the default port will be changed Loan Phone Number List to the attacker's machine. From there, copy and steal all user information, all information, requests from the Client sent to the default Gateway will go to their computer before returning. With this type of attack, the attacker can only view the content of the information packet sent out on the network. Content sent to client workstations from outside the network cannot be viewed. What are DHCP security solutions? DHCP security is an important step that should not be overlooked DHCP security is an important step that should not be overlooked Depending on the different types of attacks, there are separate, appropriate DHCP security solutions .
Let's take a look at some DHCP security solutions below: With attack using illegal DHCP client For this type of attack, switches with high security capabilities can be used. It helps limit the number of MAC addresses used on a port. This method helps limit work in the same time period. The same port has too many MAC addresses in use. In case the number of addresses exceeds the specified level, the port will be closed, stopped serving and will only operate again according to the time set by the administrator. With Man-in-the-middle attack When encountering a Man-in-the-middle attack, we can use switches with high DHCP snooping security features . This way, DHCP connections will be limited to untrusted ports. Only trusted ports will allow DHCP response packets to operate, and only this port will be allowed by the administrator to connect to the real server.