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Extrusion Detection: Security Monitoring for Internal Intrusions |  | Author: Richard Bejtlich
Publisher: Addison-Wesley Professional
Category: Book
List Price: $54.99
Buy New: $34.64
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Seller: BookHouseUSA
Rating:  9 reviews
Sales Rank: 394404
Media: Paperback
Pages: 416
Number Of Items: 1
Shipping Weight (lbs): 1.6
Dimensions (in): 9.1 x 6.9 x 1.1
ISBN: 0321349962
Dewey Decimal Number: 005.8
EAN: 9780321349965
ASIN: 0321349962
Publication Date: November 18, 2005
Availability: Usually ships in 1-2 business days
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Product Description
Overcome Your Fastest-Growing Security Problem: Internal, Client-Based Attacks Today's most devastating security attacks are launched from within the company, by intruders who have compromised your users' Web browsers, e-mail and chat clients, and other Internet-connected software. Hardening your network perimeter won't solve this problem. You must systematically protect client software and monitor the traffic it generates. Extrusion Detection is a comprehensive guide to preventing, detecting, and mitigating security breaches from the inside out. Top security consultant Richard Bejtlich offers clear, easy-to-understand explanations of today's client-based threats and effective, step-by-step solutions, demonstrated against real traffic and data. You will learn how to assess threats from internal clients, instrument networks to detect anomalies in outgoing traffic, architect networks to resist internal attacks, and respond effectively when attacks occur. Bejtlich's The Tao of Network Security Monitoring earned acclaim as the definitive guide to overcoming external threats. Now, in Extrusion Detection, he brings the same level of insight to defending against today's rapidly emerging internal threats. Whether you're an architect, analyst, engineer, administrator, or IT manager, you face a new generation of security risks. Get this book and protect yourself. Coverage includes - Architecting defensible networks with pervasive awareness: theory, techniques, and tools
- Defending against malicious sites, Internet Explorer exploitations, bots, Trojans, worms, and more
- Dissecting session and full-content data to reveal unauthorized activity
- Implementing effective Layer 3 network access control
- Responding to internal attacks, including step-by-step network forensics
- Assessing your network's current ability to resist internal attacks
- Setting reasonable corporate access policies
- Detailed case studies, including the discovery of internal and IRC-based bot nets
- Advanced extrusion detection: from data collection to host and vulnerability enumeration
About the Web Site Get book updates and network security news at Richard Bejtlich's popular blog, taosecurity.blogspot.com, and his Web site, www.bejtlich.net.
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| Customer Reviews:
Showing reviews 1-5 of 9
 Excellent Book! July 15, 2006
Bob Burd (Mesa, Arizona United States)
1 out of 1 found this review helpful
I have had the pleasure of reading Extrusion Detection: Security Monitoring for Internal Intrusions by Richard Bejtlich. Richard Bejtlich picks up where he last left off with his first book Tao of Network Security Monitor: Beyond Intrusion Detection. His new book deals with a subject that many businesses don't wish to think about, and what over 50% of attacks come from, Security breaches that come from the inside an organization. It is very unfortunate that this fact was not taken into consideration in Microsoft's XP SP2 firewall.
Richard starts with a short review of network definitions. One concept I really like is the Defensible Network which he states is not necessarily a secure network, "quite accurate".
Richard includes a listing networking monitoring tools with where you can go to obtain them; Full Content Data, Session Data, and Statistical.
This book includes good illustrations, explained pieces of code (more toward the second half of the book), and includes pictures of familiar hardware.
A new definition for me was "the sink hole", that redirects unknown traffic away from the customers.
This book is a good read and a very good book to keep in one's reference library. I will be obtaining Richard Bejtlich's Tao of Network Security Monitor: Beyond Intrusion Detection and I suspect this will be just as good.
Another 5 Star Book by Bejtlich January 22, 2009
Joshua Brower (USA)
This is my 2nd book by Bejtlich that I have read, with the first being The Tao of Network Security Monitoring: Beyond Intrusion Detection While the Tao of NSM focused mainly on detecting attacks coming in from the perimeter, this book focused on Network Security Monitoring principles as applied to traffic going out of the network.
Bejtlich starts out by doing an overview of Network Security Monitoring, referencing his earlier book as a more in-depth treatise on NSM. He then goes on to the theory and illustration of "Extrusion Detection." ("'The process of identifying unauthorized activity by inspecting outbound network traffic.") We see Extrusion Detection illustrated with the 4 types of NSM data. (Full Content, Session, Statistical, and Alert)
We then moved onto "Enterprise Network Instrumentation," which included discussions on network/packet capture equipment, some I had never seen before: SPAN Regeneration Taps, Link Aggregator Taps, etc.
The next section was probably my favorite: Enterprise Sink Holes. What a fantastic way to discover a local compromised host scanning your internal network. This section also had some great ways to do short-term containment (with a Sink Hole) on a loose worm. (The coolest, in my opinion, being Unicast Reverse Path Forwarding)
Next we have sections on Traffic Threat Assessments, Network Incident Response, and Network Forensics. The book finishes up with a case study on traffic threat assessment and a discussion on Malicious Bots.
I have to give this book 5 stars out of 5 for it's fresh and unique look at internal and outbound intrusions. Richard doesn't rehash what a thousand other network security pros have written.
Josh
Excellent Book July 20, 2006
S. Thuraisamy (Toronto, Canada)
0 out of 1 found this review helpful
Richard Bejtlich done great job again. Tao of Network security and this one are best companion. Well written. Extrusion topic is mostly companies preferred to spend budget or time and ignore. Although NSM methodologies are repeated but fun to read again. Traffic threat assessment, designing defensive network, and incident response are well written,
super March 8, 2007
E. Schnyder (Luzern Schweiz)
0 out of 1 found this review helpful
Thanks a lot, we are very happy to have this book in our library!
 An extraordinary book ... December 5, 2005
Christos Partsenidis (Thessaloniki, Greece - www.Firewall.cx)
12 out of 12 found this review helpful
Following the success of 'The Tao of Network Security Monitoring' last year, world renowned security expert Richard Bejtlich raises once again the standard for security professionals, this time by focusing on analyzing threats coming from within our network - a kind of underestimated area.
Traditionally, the point of network security is about keeping the bad guys out of a network ¡V ¡¥out¡¦ being where we hope they are to start with. Possible points of entry are considered to be devices accessible from the outside in some way, mostly servers and perhaps routers. Workstations with no address on the network have no apparent footprint that would betray their existence, so if potential intruders don't even know the hosts exist, and are unable to make any connection to them, how could they possibly exploit them? The truth is they can, in many ways, using not only technical skills but imagination and ability to exploit the human factor - against which no automated procedure or device can defend for long.
Furthermore, many administrators put all their effort and resources into trying to design an impenetrable network infrastructure, but ignore the fact that every prevention measure is bound to fail at any moment. These administrators put little or no thought into the possibility of a real intrusion and, as a result, when it occurs the network infrastructure they've built doesn't allow them to cut their losses to a minimum, regain control in a timely manner and collect credible evidence that may lead to a future investigation.
This, Richard Bejtlich's second book on the subject of network security, attempts to establish into readers' minds a solid grounding on how things are, while emphasizing common misconceptions of the past. By intentionally introducing concepts like 'Extrusion Detection', 'Defensible Network' and 'Pervasive Network Awareness' instead of relying on popular synonyms/counterparts, he addresses issues that have not been addressed - or given the appropriate importance - elsewhere.
Extrusion Detection is an extraordinary book in the sense that it moves in parallel between theory and practice, suggesting ways of thinking or functioning and explaining how these could be implemented utilizing available software.
Who should read this book?
Everyone will find in this book valuable ideas never considered before. Well, of course this is a network-security book, so those that will directly benefit from it are administrators and architects of large networks - or anyone that expects to find himself in such position.
What will you learn from this book?
Richard Bejtlich's book will take you deeply into the following skills:
- Designing defensible network infrastructures. As you will find out, a defensible network is a superset, and more accurate version, of what is referred to elsewhere as a 'secure network'. Given the fact that there can be no totally secure network, a defensible network is the best security status that can possibly be achieved through designing, monitoring, controlling and policing procedures.
- Deploying Intrusion Detection/Prevention Systems in a way that will maximize their efficiency.
- Following a series of technical practices to minimize the possibility of exposure of internal networks to the outside. Also dealing with the network effects of host-centric security threats like viruses, malware, trojans and worms, through traffic-control means.
- Designing and following security policies that will minimize the resistance, detection and counter-reaction abilities of internal networks to any intruders.
- Overcoming possible technical obstacles in order to have an appropriately monitored network, in other words achieving Pervasive Network Awareness. Available hardware and software products, as well as methods for their optimum deployment, are described in detail.
- Utilizing well-established techniques, like routing and traffic filtering/control in multiple layers to increase the network's defensibility.
- Capturing, analyzing, safekeeping and concentrating traffic in various levels. Making distinctions between malicious and legitimate traffic, detecting misconfiguration anomalies and taking the appropriate course of action in each circumstance.
- Responding, in the event of an intrusion, in a way that will minimize the consequences and the extent of the intrusion while gathering, analyzing and preserving all possible evidence. Classifying/assessing any possible threat and making the best decisions in real-time.
- Presenting evidence and conclusions derived by technical means, in a courtroom or to another, non-technical audience.
Recommended skills to get the most out of this book:
- Familiarity with basic networking and security concepts is required. You need to understand how TCP/IP works, how traffic filtering applies and how intruders commonly attack.
- Familiarity with open source operating systems is highly recommended. Though the book is written in such a way that its concepts apply beyond specific operating systems or other software and any specific instructions serve only as examples, it is true that some of the best security-related products are only available for unix platforms, so you should know how to find your way around installing and configuring them.
- Host-based security practices are not discussed, the reader is expected to know how to productively administer and secure the operating systems he deploys.
- Some of the techniques discussed involve writing basic scripts to make their deployment worthwhile and/or possible. Basic understanding of programming principles and familiarity with some scripting language is highly recommended.
- Extrusion detection does not differ in concept from intrusion detection. Any experience in intrusion detection techniques can easily be applied to extrusion detection and would be beneficial. Readers that are looking for a more thorough reading regarding those techniques are highly encouraged to read Richard Bejtlich's 'The TAO of Network Security Monitoring'.
Conclusion: This is a must-read for all security professionals or enthusiasts, networking architects and administrators that like to know what's going on in their network. I am confident that 90% of everyone that read it will make haste to implement many of the valuable ideas suggested, right after they finish reading!
Showing reviews 1-5 of 9
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