Book Image

The Web Application Hacker's Handbook

By : Dafydd Stuttard, Marcus Pinto
Book Image

The Web Application Hacker's Handbook

By: Dafydd Stuttard, Marcus Pinto

Overview of this book

Web applications are the front door to most organizations, exposing them to attacks that may disclose personal information, execute fraudulent transactions, or compromise ordinary users. This practical book has been completely updated and revised to discuss the latest step-by-step techniques for attacking and defending the range of ever-evolving web applications. Youíll explore the various new technologies employed in web applications that have appeared since the first edition and review the new attack techniques that have been developed, particularly in relation to the client side. The book starts with the current state of web application security and the trends that indicate how it is likely to evolve soon. Youíll examine the core security problem affecting web applications and the defence mechanisms that applications implement to address this problem, and youíll also explore the key technologies used in todayís web application. Next, youíll carry out tasks for breaking into web applications and for executing a comprehensive attack. As you progress, youíll learn to find vulnerabilities in an application's source code and review the tools that can help when you hack web applications. Youíll also study a detailed methodology for performing a comprehensive and deep attack against a specific target. By the end of this book, youíll be able to discover security flaws in web applications and how to deal with them.
Table of Contents (32 chapters)
Free Chapter
About the Authors
About the Technical Editor
MDSec: The Authors’ Company
End User License Agreement

Injecting into Back-end HTTP Requests

The preceding section described how some applications incorporate user-supplied data into back-end SOAP requests to services that are not directly accessible to the user. More generally, applications may embed user input in any kind of back-end HTTP request, including those that transmit parameters as regular name/value pairs. This kind of behavior is often vulnerable to attack, since the application often effectively proxies the URL or parameters supplied by the user. Attacks against this functionality can be divided into the following categories:

  • Server-side HTTP redirection attacks allow an attacker to specify an arbitrary resource or URL that is then requested by the front-end application server.
  • HTTP parameter injection (HPI) attacks allow an attacker to inject arbitrary parameters into a back-end HTTP request made by the application server. If an attacker injects a parameter that already exists in the back-end request, HTTP parameter pollution...