Web Application Security: A Beginner's Guide by Vincent T. Liu, Bryan Sullivan

By Vincent T. Liu, Bryan Sullivan

Security Smarts for the Self-Guided IT Professional

"Get to grasp the hackers—or plan on getting hacked. Sullivan and Liu have created a savvy, essentials-based method of net app defense jam-packed with instantly appropriate instruments for any info safety practitioner polishing his or her instruments or simply beginning out." —Ryan McGeehan, safeguard supervisor, fb, Inc.

Secure internet purposes from today's so much devious hackers. Web program defense: A Beginner's Guide is helping you inventory your safety toolkit, hinder universal hacks, and guard speedy opposed to malicious attacks.

This useful source contains chapters on authentication, authorization, and consultation administration, in addition to browser, database, and dossier security—all supported by means of precise tales from undefined. You'll additionally get top practices for vulnerability detection and safe improvement, in addition to a bankruptcy that covers crucial protection basics. This book's templates, checklists, and examples are designed that can assist you start correct away.

Web program safety: A Beginner's Guide features:
Lingo—Common safeguard phrases outlined in order that you're within the recognize at the job
IMHO—Frank and proper reviews in keeping with the authors' years of experience
Budget Note—Tips for buying safeguard applied sciences and techniques into your organization's budget
In real Practice—Exceptions to the principles of protection defined in real-world contexts
Your Plan—Customizable checklists you should use at the task now
Into Action—Tips on how, why, and while to use new abilities and methods at paintings

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Additional info for Web Application Security: A Beginner's Guide

Sample text

A real-world example of this scenario is the Asprox SQL injection worm that started attacking web sites in 2008. The worm searched Google to find sites that were potentially d Liu / 616-8 / Chapter 2 Chapter 2 Security Fundamentals vulnerable to injection attacks, and in a clever twist, when it found one, it did not pull out the victim’s data, but rather added its own data in. When the victim web application pulled data from its now-compromised database to display to users, it actually served them the Asprox worm’s injected malware.

While 1-Click is enabled by default, you can choose to disable it by editing your account settings. In Actual Practice It’s good that Amazon allows you to reduce your attack surface by opting out of 1-Click, but Microsoft’s opt-in approach is better for the user. When you’re designing your own web applications, go for an opt-in approach when possible. For example, if your application accepts credit card payments and you want to allow your users to store their card information on your server for future transactions, it’s better to make them check a checkbox to opt in to that rather than making them uncheck a checkbox to opt out.

Under the covers, the browser is just building HTTP requests, sending them to the web application, and processing the application’s HTTP responses. There’s absolutely nothing to prevent an attacker from manually crafting an HTTP request (or even easier, modifying an outgoing request that the browser has already gone to the trouble of creating itself) and then sending that to the target application. And there’s no way for the web application to tell that this has happened. cxx Content-Length: 143 Content-Type: application/x-www-form-urlencoded exteriorColor=';EXEC+xp_cmdshell+'…' The key takeaway from this is that it’s impossible to defend the server-side logic of a web application by implementing defenses on the client side.

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