Kamis, 12 Mei 2011

[A336.Ebook] Ebook Web Application Obfuscation: '-/WAFs..Evasion..Filters//alert(/Obfuscation/)-', by Mario Heiderich, Eduardo Alberto Vela Nava, Gareth Heye

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Web Application Obfuscation: '-/WAFs..Evasion..Filters//alert(/Obfuscation/)-', by Mario Heiderich, Eduardo Alberto Vela Nava, Gareth Heye

Web Application Obfuscation: '-/WAFs..Evasion..Filters//alert(/Obfuscation/)-', by Mario Heiderich, Eduardo Alberto Vela Nava, Gareth Heye



Web Application Obfuscation: '-/WAFs..Evasion..Filters//alert(/Obfuscation/)-', by Mario Heiderich, Eduardo Alberto Vela Nava, Gareth Heye

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Web Application Obfuscation: '-/WAFs..Evasion..Filters//alert(/Obfuscation/)-', by Mario Heiderich, Eduardo Alberto Vela Nava, Gareth Heye

Web applications are used every day by millions of users, which is why they are one of the most popular vectors for attackers. Obfuscation of code has allowed hackers to take one attack and create hundreds-if not millions-of variants that can evade your security measures. Web Application Obfuscation takes a look at common Web infrastructure and security controls from an attacker's perspective, allowing the reader to understand the shortcomings of their security systems. Find out how an attacker would bypass different types of security controls, how these very security controls introduce new types of vulnerabilities, and how to avoid common pitfalls in order to strengthen your defenses.



  • Named a 2011 Best Hacking and Pen Testing Book by InfoSec Reviews
  • Looks at security tools like IDS/IPS that are often the only defense in protecting sensitive data and assets
  • Evaluates Web application vulnerabilties from the attacker's perspective and explains how these very systems introduce new types of vulnerabilities
  • Teaches how to secure your data, including info on browser quirks, new attacks and syntax tricks to add to your defenses against XSS, SQL injection, and more

  • Sales Rank: #944888 in eBooks
  • Published on: 2011-01-13
  • Released on: 2011-01-13
  • Format: Kindle eBook

Review

"As the data stored in Web application systems becomes critical to business, the attacks against them are becoming increasingly complex. If you want to move your understanding beyond 'or 1=1--' this book provides the knowledge needed to bypass both filters and detection, crucial for both attack and defence." -- Andrew Waite, Security Researcher, InfoSanity Research

From the Back Cover

Web applications are used every day by millions of users, which is why they are one of the most popular vectors for attackers. Obfuscation of code has allowed hackers to take one attack and create hundreds-if not millions-of variants that can evade your security measures. Web Application Obfuscation takes a look at common Web infrastructure and security controls from an attacker's perspective, allowing the reader to understand the shortcomings of their security systems. Find out how an attacker would bypass different types of security controls, how these very security controls introduce new types of vulnerabilities, and how to avoid common pitfalls in order to strengthen your defenses.

About the Author
Mario Heiderich is a Cologne, Germany-based freelancer and entrepreneur who is devoted to Web application development and security and is currently working on several projects while earning his Ph.D. at Ruhr University in Bochum. He graduated from the University of Applied Sciences in Friedberg/Hessen with a degree in media informatics, and has been working for several German and international companies as a developer and security consultant. In addition to being lead developer for the PHPIDS and author of a German book about Web application security, he has been a speaker at several conferences and a trainer for Web security classes around the world. His work is focused on client-side attacks and defense, especially markup, CSS, and JavaScript, on all major user agents.

Eduardo Alberto Vela Nava (Application Security Specialist) works as an information security researcher at Google, Inc., with the task of improving the security of Google and the Internet as a whole, by researching security problems and creating solutions to them. His primary focus is Web application security and browser/plug-in security. He has been a presenter focusing on Web security at several conferences around the world. He previously worked at Alibaba Cloud Computing and Hi5 Networks.

Gareth Heyes is based in the United Kingdom and does Web security contracting work and the occasional Web development project. He has been a speaker at the Microsoft BlueHat, Confidence Poland, and OWASP conferences, and is the author of many Web-based tools and sandboxes, including Hackvertor, JSReg, CSSReg, and HTMLReg.

David Lindsay is a senior security consultant with Cigital Inc., where he works with industry-leading financial, healthcare, and software companies helping to secure their critical applications. He provides professional assessments and remediation assistance in the form of penetration tests, architecture risk analysis, code review, and security training. He researches Web application security vulnerabilities focusing on emerging security issues related to new standards, frameworks, and architectures. He has spoken at many leading security events over the past few years, including the Microsoft BlueHat, BlackHat, and OWASP conferences.
David graduated from the University of Utah with a master's degree in mathematics.

Most helpful customer reviews

8 of 8 people found the following review helpful.
I bought this book on faith and it delivered
By Richard Bejtlich
I had really no idea what to expect when I started reading Web Application Obfuscation (WAO). I hoped it would address attacks on Web technologies, perhaps including evasion methods, but beyond that I didn't even really know how to think about whatever problem this book might address. After finishing WAO, it's only appropriate to say "wow." In short, I had no idea that Web browsers (often called "user agents" in WAO) are so universally broken. Web browser developers would probably reply that they're just trying to handle as much broken HTML as possible, but the WAO authors show this approach makes Web "security" basically impossible. I recommend reading WAO to learn just how crazy one can be when interacting with Web apps.

Speaking of crazy: ch 4 was off the hook. For example, p 121 speaks of the "great Javascript Charwall" by saying: "6 is the fewest number of characters possible which allow arbitrary Javascript to be executed." What!? I had no idea anyone spent time on these sorts of issues, and worse, that intruders could use these techniques to evade a slew of security mechanisms. This was a primary strength of WAO: bringing the reader into a world where obfuscation is an obsession.

I liked many other aspects of WAO. The book was very thorough. For one example, check the table on p 27. For another, see the regex explanation with examples in ch 1. The book has many such sections where the authors offer great detail on the subject at hand. I also enjoyed the many references to outside work. Authors of all technical books should follow WAO's lead, because 1) it gives credit where due and 2) it shows the authors are aware of outside influences and up-to-date.

WAO also does a nice job explaining how we arrived at the current state of broken Web technologies. Their history lesson of the browser wars in ch 2 set the stage for the chaos that follows. I'll finish my praises by mentioning the Web site the authors created as a companion to the book, complete with errata and code listings; it's a nice addition to the book.

If you're wondering why I rated WAO four instead of five stars, the reason involves the audience. I think too often the authors advance pretty far beyond the uninitiated reader. You have to admit that if obfuscation is your world, you're probably not going to read this book. However, if you're a newbie like me, you need the authors to spend more time explaining what they're doing and more importantly, WHY. Just what is the purpose of this technique or that attack? I think if the authors recruited some outside help to walk through the book, slow them down, and answer some basic questions, a second edition would be an easy five star work.

On the production side, a new edition should redraw figures 5.2 - 5.14. They look like they came straight from a PowerPoint pitch.

Overall, WAO is a great book to shatter any assumptions you may have about how Web clients and servers render content. Maybe the authors would care to describe how best one can operate in such a dangerous environment, i.e., is their an OpenBSD for Web technologies? All of the engines seem bad -- what's a user to do?

2 of 2 people found the following review helpful.
take client-side attacks to the next level
By Likes to eat Pi
As so many attacks have begun to move to targeting the client, it's helpful to understand how the client (which is usually a browser), handles what it's given. This book goes through several technologies including HTML, Javascript, VB script, CSS, PHP, and SQL, and shows how the normal syntax can be obfuscated. For the most part the authors present most of the material as background information, and don't bother connecting the dots to show you how their techniques could be used in an attack. The assumption is that the reader is already very familiar with web application security, and can apply the knowledge provided.

I learned something in every chapter. Some of the more interesting things addressed were:
* Non-alphanumeric Javascript. In other words, functional Javascript that consist of no letters or numbers.
* There was a very detailed discussion of alternate ways to execute Javascript within the DOM. Many of these techniques could be used to bypass filters.
* How using non-standard character sets can confuse browsers and possibly bypass filters.
* How different browsers handle non-standard compliant markup, some of which could lead to script execution.
* How to launch a port scan using CSS.
* Executing code within CSS.

PHP, being server-side code, seems to be the odd man out in this book, but I guess they included it only for the sake of completeness. The title would have led me to believe there was a greater discussion of WAFs, but in fact it only got a few pages and the cursory conclusion of "they can probably be bypassed". While that was disappointing it still doesn't detract from the great reference material presented here.

1 of 1 people found the following review helpful.
Good For Veterans, Tough On Beginners
By Quality Man
I fall into the secondary audience for this book in that I am a software developer looking to introduced to the subject. The book dives in quickly -- a little too quickly for someone like me. Chapter 1 is perhaps the weakest 'Chapter 1' I've ever read in a tech book, for example, with most of these mere 12 pages covering regular expressions and the layout of the book. So the book's true introduction to obfuscation is around 3 pages in the chapter. I might have to search the web for some better background or re-read the book. Note, I'm skilled in SQL, CSS, HTML, Javascript, etc., so it's not that I am unfamiliar with the core technologies discussed. The style in the book also ended up being dry, but some of that could be due the mental challenge of reading obfuscated code. Nevertheless, I did walk away from the book having a better appreciation about obfuscation, the principles behind the techniques, and some possible defense tactics.

I found myself on the verge of giving this book 4 stars thinking that for the primary intended audiences, they'd really love it. However, I decided to rate it based on the perspective of me being new to the subject. Some improvement is need in that area as well as perhaps the flow of the book. I'd like to see more defense solutions actually integrated with each technical chapter instead of the defense all presented at the end of the book.

See all 11 customer reviews...

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