24 internautes sur 24 ont trouvé ce commentaire utile
- Publié sur Amazon.com
The 1962 song Wipe Out, with its energetic drum solo started, was the impetus for many people to take up playing the drums. Similarly, Nmap, the legendary network scanner, likely interested many in the art of hacking, and for some, started a career for security professionals and hackers. Nmap and its creator Fyodor need no introduction to anyone on Slashdot. With that, Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning, is a most useful guide to anyone interested in fully utilizing Nmap.
One may ask, why spend $50 on this book, when the Nmap Reference Guide provides a significant amount of the basic information needed to use the tool, especially since the reference guide is both free, and well written. The reference guide is included in the book in chapter 15, and takes up 41 pages. And for those that are cash strapped, the free reference guide is the way to go.
In addition, the web site for the book notes that about half of the content is available in the free online edition. The most useful information is in the book in chapters exclusive to the print edition, which includes Detecting and Subverting Firewalls and Intrusion Detection System, Optimizing Nmap Performance, Port Scanning Techniques and Algorithms, Host Discovery, and troubleshooting.
The main benefit of the buying the book is that it has the collected wisdom of Fyodor's, in addition to numerous real-world scenarios, and Nmap commands not documented elsewhere. At over 400 pages, the books 15 chapters provide the reader with everything they need to know about using Nmap to the fullest.
Chapter 1 starts with an overview of the history of Nmap and how it came to be. As to the question of whether port scanning is legal, the author writes that it is best to avoid the debate and its associated analogies. He advises that it's best to avoid ISP abuse reports and criminal charges, by not annoying the target network administrators in the first place. Chapter 1 provides a number of practical suggestions on just how to do that.
A complaint against Nmap it that is has often been blamed for crashing systems. Chapter 1 shows that the reality is that Nmap will rarely be the primary cause of a system crash. The truth is that many of the systems that crashed as a result of an Nmap scan were likely unstable from the outset, and Nmap either pushed them over the top or they coincidentally crashed at the same time as the Nmap scan.
An ironic incident detailed in chapter 3 is when someone from the information security department of Target Corp. complained to the author that he felt the Nmap documentation was particularly directed at his organization; given the use of the term target. He requested that the Nmap documentation be changed from targetto example. The section on target enumeration in the book shows the author did not take that request to heart.
Another example of where the book goes beyond what is in the reference guide is where the author shows the most valuable TCP ports via his probe of tens of millions of IP addresses across the internet. Not surprisingly, ports 80 23 and 443 were the top three most commonly open TCP ports. It is surprising that other ports, which should have been secured long ago, are still as vulnerable as ever.
For the serious Nmap user, the book is worth purchasing just for the indispensable information in chapter 16, which is about optimizing Nmap performance. The author writes that one of his highest priorities in the creation of Nmap has been performance. Nmap uses parallelism and numerous advanced algorithms to execute its blazingly fast scans. This chapter shows how to create Nmap commands to obtain only the information you care about and significantly sped up the scan. The chapter details numerous scan time reduction techniques, and strategies on how to deal with long scans. The chapter concludes with the output of a user who, with a customized Nmap command, was able to reduce his scan of a 676,352 IP address network from nearly a week to 46 hours.
Chapter 10 is also a fascinating chapter on the topic of detection and subverting of firewalls and IDS. The function of such tests on an internal network is to help an organization understand the dangers and risks of a real attack. Since it is not uncommon for firewalls to be accidentally misconfigured, or have rule bases that leak from far too many rules; such a test can be quite useful to any network.
Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning is the guide for anyone who wants to get more out of Nmap. It is useful whether one is a novice and only getting into basic security testing, or an advanced user looking for ways to optimize Nmap.
The book takes a real-world approach on how to use the tool and clearly documents every Nmap feature and option. It also shows how the tool should be correctly used in various settings.
What is unique about is that this is a rare book in which the creator of the program wrote it. Linus Torvalds never got around to writing a Linux reference, nor did the creators of the Check Point firewall. In Nmap Network Scanning, the reader gets the story from the creator of the code itself. This then is the ultimate Nmap reference guide.
Aside from the history and use of the program in the first chapter, the rest of the book is an extreme guide to maximizing the use of Nmap. It is written by a programmer and written for the technically astute. Anyone who wants to maximize their use of Nmap will find no better reference.
8 internautes sur 8 ont trouvé ce commentaire utile
- Publié sur Amazon.com
I could summarize this book review by saying this is THE nmap reference book, what in itself would be an obvious conclusion I already expected before reading a single page, just by looking at the author name. Fyodor is the creator of nmap, a tool he has carefully fed and taken care of during all these years, and slightly knowing him from the Honeynet project, I couldn't expect less.
"Nmap Network Scanning" is a masterpiece that teaches the reader the Art of Network Mapping and Scanning, and definitely, one of the best books I've read in years. Honestly, there are only a few minor things regarding network scanning you cannot accomplish with a single tool, the current nmap version. The book takes advantage of it.
The official nmap reference guide is simply included on chapter 15, while the rest of the book steers the reader through the nifty art of network mapping and scanning. It disects the network scanning phases and techniques, describing the different options and tool arguments available throughout practical examples and real-world usage tips, here and there, that will improve all your scanning techniques. This is a never-ending book that took Fyodor 5 years to write, and it clearly spreads his experience testing and analyzing networks. This is specially true in the "Solution" section at the end of some chapters, where real-world scenarios are efficiently solved.
Additionally, the book clearly pinpoints the limitations for the multiple platforms (eg. Windows vs Linux) and scenarios (eg. privileged vs non-privileged user) nmap can run on. Besides that, it summarizes most nmap internals without requiring you to dive deep into the source code, what is a challenge in itself. All this information is complemented with some real challenges you find as a penetration tester today, such as the limitations to spoof Internet traffic from legal ISP, a topic I've been researching about recently.
The most advanced and technical chapters are chapter 7 and 8, detailing the inner workings of the nmap service, application, and OS fingerprinting modules, and chapter 9, providing the NSE knowledge required to read and develop your own nmap scripts.
This is the type of book I recommend you to read in front of your computer, practicing simultaneously. Open a terminal, enable your network connection, and run the latest nmap version as you read throughout the book while testing the different options and examples. You can use multiple target virtual machines to experiment with, or if not available, the scanme.nmap.org site (use with caution). One thing is sure: you will have a lot of fun!
I have been using nmap since 1999, and found the book fits a broader audience, from the novice reader (please, do not get overwhelmed initially by all the available nmap options and scan types), that can learn the principles of the scanning techniques used (the packet flow diagrams on the port scanning chapter are specially helpful), up to the advanced professional, explaining what's behind the scenes of every technique and nmap argument, at the OS and network traffic level. The book applies to most security professionals, from security administrators that need to manage and secure their environments, to penetration testers interested on driving their skills to a new level.
This is the kind of book that feeds your creativity and research motivation. Fyodor, once again, promotes along the book the open-source philosophy, the need to share and contribute to the community, in this case in the form of OS and service fingerprints, NSE scripts, or just reporting nmap bugs.
Some minor things I would have liked to see mentioned for an extra finishing touch, offering my tiny contribution for a future version, are:
- A statistical analysis of the most common ICMP types currenty allowed on the field, similar to the study for TCP and UDP ports Fyodor did. On my experience, for example, I find ICMP timestamps allowed much frequently than ICMP netmask requests today.
- Extend the analysis of port knocking with the Single Packet Authorization (SPA) concept.
- Finally, I would have loved to see specific sections for the new nmap-related tools, such as ndiff (the command line version), or ncat.
Respectfully, once I finished reading the book I feel like Raul "Fyodor" Siles..., you will do too! :)
Fyodor was generous enough to release an extensive portion of the book for free on the official nmap book website. Take a look at it and you won't doubt about getting your own full copy.