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Ajax Security
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From the Back Cover
The Hands-On, Practical Guide to Preventing Ajax-Related Security Vulnerabilities More and more Web sites are being rewritten as Ajax applications; even traditional desktop software is rapidly moving to the Web via Ajax. But, all too often, this transition is being made with reckless disregard for security. If Ajax applications aren't designed and coded properly, they can be susceptible to far more dangerous security vulnerabilities than conventional Web or desktop software. Ajax developers desperately need guidance on securing their applications: knowledge that's been virtually impossible to find, "until now." "Ajax Security" systematically debunks today's most dangerous myths about Ajax security, illustrating key points with detailed case studies of actual exploited Ajax vulnerabilities, ranging from MySpace's Samy worm to MacWorld's conference code validator. Even more important, it delivers specific, up-to-the-minute recommendations for securing Ajax applications in each major Web programming language and environment, including .NET, Java, PHP, and even Ruby on Rails. You'll learn how to: - Mitigate unique risks associated with Ajax, including overly granular Web services, application control flow tampering, and manipulation of program logic - Write new Ajax code more safely-and identify and fix flaws in existing code - Prevent emerging Ajax-specific attacks, including JavaScript hijacking and persistent storage theft - Avoid attacks based on XSS and SQL Injection-including a dangerous SQL Injection variant that can extract an entire backend database with just two requests - Leverage security built into Ajax frameworks like Prototype, Dojo, and ASP.NET AJAX Extensions-and recognize what you still must implement on your own - Create more secure "mashup" applications "Ajax Security" will be an indispensable resource for developers coding or maintaining Ajax applications; architects and development managers planning or designing new Ajax software, and all software security professionals, from QA specialists to penetration testers.
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About the Author
Billy Hoffman is the lead researcher for HP Security Labs of HP Software. At HP, Billy focuses on JavaScript source code analysis, automated discovery of Web application vulnerabilities, and Web crawling technologies. He has worked in the security space since 2001 after he wrote an article on cracking software for 2600, “The Hacker Quarterly,” and learned that people would pay him to be curious. Over the years Billy has worked a variety of projects including reverse engineering file formats, micro-controllers, JavaScript malware, and magstripes. He is the creator of Stripe Snoop, a suite of research tools that captures, modifies, validates, generates, analyzes, and shares data from magstripes. Billy’s work has been featured in Wired, Make magazine, Slashdot, G4TechTV, and in various other journals and Web sites. Billy is a regular presenter at hacker conferences including Toorcon, Shmoocon, Phreaknic, Summercon, and Outerz0ne and is active in the South East hacking scene. Occasionally the suits make him take off the black t-shirt and he speaks at more mainstream security events including RSA, Infosec, AJAXWorld, and Black Hat. Billy graduated from the Georgia Institute of Technology in 2005 with a BS in Computer Science with specializations in networking and embedded systems. He lives in Atlanta with his wife and two tubby and very spoiled cats. Bryan Sullivan is a software development manager for the Application Security Center division of HP Software. He has been a professional software developer and development manager for over 12 years, with the last five years focused on the Internet security software industry. Prior to HP, Bryan was a security researcher for SPI Dynamics, a leading Web application security company acquired by HP in August 2007.While at SPI, he created the DevInspect product, which analyzes Web applications for security vulnerabilities during development. Bryan is a frequent speaker at industry events, most recently AjaxWorld, Black Hat, and RSA. He was involved in the creation of the Application Vulnerability Description Language (AVDL) and has three patents on security assessment and remediation methodologies pending review. He is a graduate of the Georgia Institute of Technology with a BS in Applied Mathematics. When he’s not trying to break the Internet, Bryan spends as much time as he can on the golf links. If any Augusta National members are reading this, Bryan would be exceedingly happy to tell you everything he knows about Ajax security over a round or two.
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Product details
Paperback: 504 pages
Publisher: Addison-Wesley Professional; 1 edition (December 16, 2007)
Language: English
ISBN-10: 0321491939
ISBN-13: 978-0321491930
Product Dimensions:
6.9 x 1.2 x 9.1 inches
Shipping Weight: 2.2 pounds (View shipping rates and policies)
Average Customer Review:
4.7 out of 5 stars
10 customer reviews
Amazon Best Sellers Rank:
#2,609,342 in Books (See Top 100 in Books)
I purchased this book as a self imposed course to help me write better, safer, and more secure web applications. The authors did a fabulous job in putting together scenarios to illustrate how websites are hacked. They also described ways in which the attacks could be prevented and reiterated their points throughout the book. By the time you complete the book, you will definitely know that you should validate every single source of input whether it's through a form, through the URL, or other source before executing any SQL using that input data, else you risk SQL Injection Attacks.I particularly loved their solution to prevent JSON Hijacking in which you have the backend attach an infinite loop to the JSON response [ for(;;); ]. Though, in searching the web on the topic, several sites recommend a different approach that ensures your JSON response is not an array:Exploitable:[{"object": "inside an array"}]Not exploitable:{"object": "not inside an array"}Also not exploitable:{"result": [{"object": "inside an array"}]}As the book described, some browsers allowed the array object type to be clobbered and replaced with new javascript code. This allowed hacks to get the array data. Most if not all current browsers no longer allow this. On the other hand, the object data type cannot be clobbered (afaik). (Note: I read on the web that modern browsers no longer allow the Array object type to be clobbered).Note, it's also recommended on many sites to use the standard CSRF prevention methods involving requesting a security token and passing the token back in the next request (described in the book and on the web). This should also help prevent JSON Hijacking.The book felt somewhat dated due to some of the real life examples and technologies explained. It had a section that was primarily focused on Google Gears, which was not widely adopted and eventually Google ended development on the project back in 2010. Google's announced the end of development of Google Gears to shift focus to provide the same capabilities into the HTML5 web standards. It would be interesting to hear the authors analysis of that.Despite it's dated feel, I still recommend this book. Much of the information is still relevant and would be beneficial to anyone looking to build websites that are more secure. Hopefully in the future, the authors will create a new revision that will include updated information and validate the common attack prevention techniques found on the web today.I recommend reading this book as a foundation to learning about building secure web sites, services, and applications. After reading this book, a number of web searches can help bring you up to date on the more modern methods to prevent hacking attacks.
A lot of examples shows how absolutely everything could be attacked and corrupted in the chain of components used for building ajax applications, from css (yes even css) to html, from javascript to http, from browser to server ... Sometimes there's too much lines about evident things and sometimes things seems more proof of concept than real possible attacks. But these guys know what they are talking about. This is an excellent book that every serious ajax developer must have read, specially if they plan to make mashups or let their users bring and share things using their applications.
Anyone involved in developing/testing AJAX should read "AJAX Security." It covers preventing a hacker from attaching your application. The audience includes developers, QA and penetration testers. While there are code snippets, they are explained well. While managers aren't in the target audience, I think they could benefit from understanding the concepts presented in the book.The book begins with a brief review of AJAX architecture with an emphasis on security. The writing style is quite engaging including a chapter walking you through an attack from a hacker's point of view. All the major known categories of attacks are included including resource enumeration, parameter manipulation (with SQL and XPATH injection), session hijacking, JSON hijacking, XSS, CSRF, phishing, denial of service, etc.I particularly liked the analogies to things that happen in the physical world such as resource injection into a roommate's "to do" list and hijacking another customer's paid order in the deli. These made it easy to visualize the problem even for people who don't code often.The authors were realistic and included the limitations and drawbacks of each tool/framework mentioned. I liked the chapter analyzing two major JavaScript worms including the source code. This really hit home on the importance of certain practices!All information was up to date as of printing including comments on all four major browsers (IE, Firefox, Opera and Safari.) They even mentioned the HTML 5 specification. The book is not server side language specific, which was nice.
This book should be required reading for anyone who is developing, working with, or even managing a web application. The application doesn't even have to use Ajax. Most of the concepts in this book are security practices for non-Ajax applications that have been extended and applied to Ajax; not the other way around. For example, SQL injection attacks can exist whether an application uses Ajax or not, but Ajax provides an attacker other "entry points" to try to attack your application. Each service, method, and parameter is considered an entry point.The book itself is well written. The style of writing is engaging. The only non-exciting part of the book is the chapter on client side storage (i.e. cookies, Flash data objects, local storage), but this is not the authors' fault. The topic itself is not very exciting and I found myself reading it quickly so I could get to the next chapter. One of the most interesting chapters is the one on JavaScript worms, like the Samy worm. Also interesting are the occasional mentions of studies and discoveries in the security community. For example, the authors describe a proof-of-concept port scanner they wrote using JavaScript alone, which has the capability of scanning IP addresses and detecting the type of web server they run (using the JS Image object). Another interesting example was using the :hover CSS class along with JavaScript to detect sites that a user has visited.After reading this book, I am finding myself correcting security errors I am only know finding in my projects. Some corrections I've made concern JSON, the GET vs. POST issue, and others. With the corrections made, I feel that my applications are a lot safer. This book helped make that happen.
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