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

Preventing Information Leakage

Although it may not be feasible or desirable to prevent the disclosure of absolutely any information that an attacker may find useful, various relatively straightforward measures can be taken to reduce information leakage to a minimum and to withhold the most sensitive data that can critically undermine an application's security if disclosed to an attacker.

Use Generic Error Messages

The application should never return verbose error messages or debug information to the user's browser. When an unexpected event occurs (such as an error in a database query, a failure to read a file from disk, or an exception in an external API call), the application should return the same generic message informing the user that an error occurred. If it is necessary to record debug information for support or diagnostic purposes, this should be held in a server-side log that is not publicly accessible. An index number to the relevant log entry may be returned to the...