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  • 2019
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  • DHCP Starvation: DoS Attacks to the DHCP Server

DHCP Starvation: DoS Attacks to the DHCP Server

April 23, 2019July 27, 2019 Comments Off on DHCP Starvation: DoS Attacks to the DHCP Server
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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:

  • Asking yourself IP -address at the DHCP server and a receives it;
  • Change the MAC addresses and ask for the next one, a different IP -address, masquerading as a new client;
  • 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 tool called Yersinia

Features:

  • 100% written in C.
  • It uses libpcap, libnet and ncurses.
  • Runs on Linux, BSD and Solaris, Mac OSX
  • Multithreaded: it supports multiple users and multiple attacks per user.
  • Examine, analyze and watch your packets
  • Edit each protocol’s fields
  • Capture your network data in pcap format.
  • Customize your preferences in a configuration file.
  • Monitor and capture packets from the network and replay them with your modifications.
  • Three main modes: command line, network client and ncurses GUI

Usage:

yersinia [-hVGIDd] [-l logfile] [-c conffile] protocol [protocol_options]

-V   Program version.
-h   This help screen.
-G   Graphical mode (GTK).
-I   Interactive mode (ncurses).
-D   Daemon mode.
-d   Debug.
-l    logfile   Select logfile.
-c   conf-file  Select config file.

Once you have git cloned and installed Yersinia lets run it

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.

 

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