Nice article on Web Application Security

Table of Contents

The guide is divided into five parts. The aim is to provide a logical partitioning, which will help you to more easily digest the content.

Part I, Introduction to Threats and Countermeasures

This part identifies and illustrates the various threats facing the network, host, and application layers. By using the threat modeling process, you can identify the threats that are relevant to your application. This sets the stage for identifying effective countermeasures. This part includes:

• Foreword by Mark Curphey
• Foreword by Joel Scambray
• Foreword by Erik Olson
• Foreword by Michael Howard
• Introduction
• Solutions at a Glance
• Fast track
• Chapter 1, Web Application Security Fundamentals
• Chapter 2, Threats and Countermeasures
• Chapter 3, Threat Modeling

Part II, Designing Secure Web Applications

This part provides the guidance you need to design your Web applications securely. Even if you have an existing application, you should review this section and then revisit the concepts, principles, and techniques that you used during your application design. This part includes:

• Chapter 4, Design Guidelines for Secure Web Applications
• Chapter 5, Architecture and Design Review

Part III, Building Secure Web Applications

This part helps you to apply the secure design practices and principles covered in the previous part to create a solid and secure implementation. You'll learn defensive coding techniques that make your code and application resilient to attack. Chapter 6 presents an overview of the .NET Framework security landscape so that you are aware of the numerous defensive options and tools that are at your disposal. Part III includes:

• Chapter 6, .NET Security Fundamentals
• Chapter 7, Building Secure Assemblies
• Chapter 8, Code Access Security in Practice
• Chapter 9, Using Code Access Security with ASP.NET
• Chapter 10, Building Secure ASP.NET Pages and Controls
• Chapter 11, Building Secure Serviced Components
• Chapter 12, Building Secure Web Services
• Chapter 13, Building Secure Remoted Components
• Chapter 14, Building Secure Data Access

Part IV, Securing Your Network, Host and Application

This part shows you how to apply security configuration settings to secure the interrelated network, host, and application levels. Rather than applying security randomly, you'll learn the reasons for the security recommendations. Part IV includes:

• Chapter 15, Securing Your Network
• Chapter 16, Securing Your Web Server
• Chapter 17, Securing Your Application Server
• Chapter 18, Securing Your Database Server
• Chapter 19, Securing Your ASP.NET Application and Web Services
• Chapter 20, Hosting Multiple ASP.NET Applications

Part V: Assessing Your Security

This part provides you with the tools you need to evaluate the success of your security efforts. It shows you how to evaluate your code and design and also how to review your deployed application, to identify potential vulnerabilities:

• Chapter 21, Code Review
• Chapter 22, Deployment Review

Checklists

This section contains printable, task-based checklists, which are printable quick-reference sheets to help you turn information into action. This section includes the following checklists:

• Checklist: Architecture and Design Review
• Checklist: Security Review for Managed Code
• Checklist: Securing ASP.NET
• Checklist: Securing Enterprise Services
• Checklist: Securing Web Services
• Checklist: Securing Remoting
• Checklist: Securing Data Access
• Checklist: Securing Your Network
• Checklist: Securing Your Web Server
• Checklist: Securing Your Database Server

How To Articles

This section contains How To articles, which provide step-by-step procedures for key tasks. This section includes the following articles:

• How To: Implement Patch Management
• How To: Harden the TCP/IP Stack
• How To: Secure Your Developer Workstation
• How To: Use IPSec for Filtering Ports and Authentication
• How To: Use IISLockdown.exe
• How To: Use the Microsoft Baseline Security Analyzer
• How To: Use URLScan
• How To: Create a Custom Encryption Permission
• How To: Use Code Access Security Policy to Constrain an Assembly

For More
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnnetsec/html/ThreatCounter.asp

Suresh Behera