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Defensive Programming for HTML5 Security

Course Description

HTML5 is the fifth revision of the HTML standard. HTML5 and its integration with JavaScript introduce new security risks that you must consider carefully when writing web front-end code. Modern web-based software, including mobile web front-end applications, make heavy use of innovative JavaScript and HTML5 browser support to deliver advanced user experiences. Front-end developers focus their efforts on creating these experiences and are generally not aware of the security implications of the technologies they use.

This course helps web front-end developers understand the risks involved with manipulating the HTML Document Object Model (DOM) and using the advanced features of JavaScript and HTML5 (e.g., cross-origin resource sharing, local storage, and content security policy). In this course, we’ll reinforce some important security aspects of modern browser architecture and present defensive programming techniques that developers can apply immediately to avoid introducing common vulnerabilities. We’ll also provide a detailed description of typical JavaScript sources and sinks and explain how to use them to detect problems in code.

Learning Objectives

Recognize that client-side code can introduce security vulnerabilities
Appreciate the HTML5 risk landscape
Apply defensive programming techniques in HTML5
Identify and fix security vulnerabilities in HTML5 code

Details

Delivery Format: eLearning

Duration: 1 hour 30 minutes

Level: Intermediate

Intended Audience:

Front-End Developers
Mobile Developers

Prerequisites:

Course Outline

Risk Landscape

Modern Browsers
Modern Web Applications
The Attack Surface
The Reincarnation of Cross-Site Scripting

The Security Model of the Web

Same-Origin Policy
Same-Origin Policy Example
Sidestepping the SOP with Clickjacking
JavaScript Execution
Subresource Integrity

Client-Side Data Storage

Risks of Client-Side Data Storage
Security Considerations
Clearing Data

Web Messaging

Sending Messages
Receiving Messages
Overview of Best Practices

Iframe Sandboxing

The Sandbox Attribute
Relaxing the Sandbox
Sandboxing Use Cases
Consequences of the Sandbox

Content Security Policy (CSP)

Defining a CSP Policy
Limiting Cross-Site Scripting with CSP
Deploying a Strong CSP Policy
CSP Beyond XSS
Additional CSP Features
Overview of Best Practices

Understanding Cross-Origin Resource Sharing

Simple CORS Requests
Authenticated CORS Requests
Understanding the Threat Model of CORS
Preflighted CORS Requests
Handling Headers with CORS
CORS Beyond JavaScript

Securing Web Applications with CORS

Special CORS Cases
Building a CORS Policy
CORS and CSRF
Testing Your CORS policy

Additional HTML5 features

Permission-Based APIs
Web Workers
WebSockets

Conclusion

Controlling JavaScript
Compartmentalization

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Training

Developer Security Training

Equip development teams with the skills and education to write secure code and fix issues faster

Learn more about developer security training