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

DNS attack discovery – tools and analysis

As the DNS protocol is very important, it is a favorite target for attackers. DNS has numerous loopholes, so let’s discuss the loopholes in the DNS protocol and how to identify them.

We will follow the same penetration-testing approach for DNS discovery:

  • DNS enumeration
  • Vulnerability scanning

DNS enumeration

DNS enumeration in penetration testing is sometimes referred to as information gathering related to a specific service that narrows down the first level of footprinting. In this chapter, we will only be performing reconnaissance on a DNS service; hence, it is called DNS footprinting.

Now, we know that DNS works on port 53; hence, our major focus will be on this port only.

Identifying name records

Let’s find all the domain name records using the nslookup or dig utility, as shown in the following screenshot:

Figure 13.4 – DNS records

The preceding figure...