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
1
Cover
2
Title
3
Copyright
4
About the Authors
5
About the Technical Editor
6
MDSec: The Authors’ Company
7
Credits
8
Acknowledgments
31
Index
32
End User License Agreement

Injecting into Mail Services

Many applications contain a facility for users to submit messages via the application, such as to report a problem to support personnel or provide feedback about the website. This facility is usually implemented by interfacing with a mail (or SMTP) server. Typically, user-supplied input is inserted into the SMTP conversation that the application server conducts with the mail server. If an attacker can submit suitable crafted input that is not filtered or sanitized, he may be able to inject arbitrary STMP commands into this conversation.

In most cases, the application enables you to specify the contents of the message and your own e-mail address (which is inserted into the From field of the resulting e-mail). You may also be able to specify the subject of the message and other details. Any relevant field that you control may be vulnerable to SMTP injection.

SMTP injection vulnerabilities are often exploited by spammers who scan the Internet for vulnerable mail...