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Python Penetration Testing Cookbook

You're reading from   Python Penetration Testing Cookbook Practical recipes on implementing information gathering, network security, intrusion detection, and post-exploitation

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Product type Paperback
Published in Nov 2017
Publisher Packt
ISBN-13 9781784399771
Length 226 pages
Edition 1st Edition
Languages
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Author (1):
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Rejah Rehim Rejah Rehim
Author Profile Icon Rejah Rehim
Rejah Rehim
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Table of Contents (15) Chapters Close

Preface 1. Why Python in Penetration Testing? FREE CHAPTER 2. Setting Up a Python Environment 3. Web Scraping with Python 4. Data Parsing with Python 5. Web Scraping with Scrapy and BeautifulSoup 6. Network Scanning with Python 7. Network Sniffing with Python 8. Scapy Basics 9. Wi-Fi Sniffing 10. Layer 2 Attacks 11. TCP/IP Attacks 12. Introduction to Exploit Development 13. Windows Exploit Development 14. Linux Exploit Development

DHCP starvation

DHCP is the protocol that helps to assign clients' IP addresses to the LAN. The process of assigning DHCP consists of four steps--DHCPDiscover, DHCPOffer, DHCPRequest, and DHCP ACK.

DHCPDiscover is the first step where the client broadcasts in the LAN to find a DHCP server that can provide an IP for the client. Then the server will respond with a unicast DHCPOffer, where it offers a possible IP. Then, the client will broadcast the DHCPRequest with the IP to all networks, and finally the server will respond with a DHCP ACK or DHCP NAK. ACK represents a successful DHCP process, while NAK represents when the IP is not available:

The DHCP server stores the IP information to MAC bindings. If we ask for too many IPs from the DHCP server, other legitimate clients will not get an IP to connect. This is known as a DHCP starvation attack. In this recipe, we will be...

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