DHCP Starvation: DOS ATTACKS TO THE DHCP SERVER
Yersinia is a network tool designed to take advantage of some weaknesses in different network protocols. It pretends to be a solid framework for analyzing and testing the deployed networks and systems. Attacks for the following network protocols are implemented: Spanning Tree Protocol (STP), Cisco Discovery Protocol (CDP), Dynamic Trunking Protocol (DTP), Dynamic Host Configuration Protocol (DHCP), Hot Standby Router Protocol (HSRP), IEEE 802.1Q, IEEE 802.1X, Inter-Switch Link Protocol (ISL), VLAN Trunking Protocol (VTP).
Attacks using DHCP Starvation, which exhausts all IP Pool DHCP server.
The operating principle of this attack is very simple:
1) Asking yourself IP -address at the DHCP server and a receives it;
2) Change the MAC addresses and ask for the next one, a different IP -address, masquerading as a new client;
3) Such action is repeated until the entire pool of IP address on the DHCP server is reached.
To automate this type of attack there is a Yersinia tool
Run Yersinia:
yersinia –I
press I and select the required interfaces.
press g and select the DHCP.
press x, to select an attack ( eXecute attack ) and select Punk 1 – Sending DISCOVER packet.
The attack started.
To stop the attacks press l, select the active attack and press the Enter.
