Book Image

Network Protocols for Security Professionals

By : Yoram Orzach, Deepanshu Khanna
5 (1)
Book Image

Network Protocols for Security Professionals

5 (1)
By: Yoram Orzach, Deepanshu Khanna

Overview of this book

With the increased demand for computer systems and the ever-evolving internet, network security now plays an even bigger role in securing IT infrastructures against attacks. Equipped with the knowledge of how to find vulnerabilities and infiltrate organizations through their networks, you’ll be able to think like a hacker and safeguard your organization’s network and networking devices. Network Protocols for Security Professionals will show you how. This comprehensive guide gradually increases in complexity, taking you from the basics to advanced concepts. Starting with the structure of data network protocols, devices, and breaches, you’ll become familiar with attacking tools and scripts that take advantage of these breaches. Once you’ve covered the basics, you’ll learn about attacks that target networks and network devices. Your learning journey will get more exciting as you perform eavesdropping, learn data analysis, and use behavior analysis for network forensics. As you progress, you’ll develop a thorough understanding of network protocols and how to use methods and tools you learned in the previous parts to attack and protect these protocols. By the end of this network security book, you’ll be well versed in network protocol security and security countermeasures to protect network protocols.
Table of Contents (23 chapters)
1
Part 1: Protecting the Network – Technologies, Protocols, Vulnerabilities, and Tools
7
Part 2: Network, Network Devices, and Traffic Analysis-Based Attacks
12
Part 3: Network Protocols – How to Attack and How to Protect

Attacks on DNS resources – DNS flooding, NX records, and subdomains

In this section, we will try to demonstrate various DNS Denial of Service (DOS) and Distributed Denial of Service (DDOS) attacks, in which an attacker sends DNS queries to increase a server’s utilization, or causes a service to respond late or never respond at all to connected users in a domain. This can be achieved with multiple levels of DNS attacks, such as DNS flooding, or with DNS amplification attacks.

NX record attacks

In this attack, the attacker will start sending fake (random) domain requests, pointing to the victim’s DNS domains, and hence the DNS resolver will start resolving the requests by generating DNS queries toward the victim’s DNS server.

Let’s try to understand this with the help of a small diagram, as shown in the following figure:

Figure 13.13 – A DOS attack on NX records

So, now we understand the NX record DOS attack...