Innocent Code : A Security Wake-Up Call for Web Programmers
Sverre H. Huseby
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Peter G. Neumann, Author of Computer-Related Risks,and moderator of the Internet Risks Forum (risks.org).
This concise and practical book will show where code vulnerabilities lie and how best to fix them. Its value is in showing where code may be exploited to gain access to - or break - systems, but without delving into specific architectures, programming or scripting languages or applications. It provides illustrations with real code.
Innocent Code is an entertaining read showing how to change your mindset from website construction to website destruction so as to avoid writing dangerous code. Abundant examples from susceptible sites will bring the material alive and help you to guard against:
SQL Injection, shell command i njection and other attacks based on mishandling meta-characters
attackers who trick users into performing actions
leakage of server-side secrets
hidden enemies such as project deadlines, salesmen, messy code and tight budgets
All web programmers need to take precautions against producing websites vulnerable to malicious attack. This is the book which tells you how without trying to turn you into a security specialist.
Table of Contents
I.1 The Rules.
I.2 The Examples.
I.3 The Chapters.
I.4 What is Not in this Book?
I.5 A Note From the Author.
1. The Basics.
1.5 Do You Want to Know More?
2. Passing Data to Subsystems.
2.1 SQL Injection.
2.2 Shell Command Injection.
2.3 Talking to Programs Written in C/C++.
2.4 The Evil Eval.
2.5 Solving Metacharacter Problems.
3. User Input.
3.1 What is Input Anyway?
3.2 Validating Input.
3.3 Handling Invalid Input.
3.4 The Dangers of Client-side Validation.
3.5 Authorization Problems.
3.6 Protecting Server-generated Input.
4. Output Handling: The Cross-site Scripting Problem.
4.2 The Problem.
4.3 The Solution.
4.4 Browser Character Sets.
4.5 Summary.; 4.6 Do You Want to Know More?
5. Web Trojans.
5.2 The Problem.
5.3 A Solution.
6. Passwords and Other Secrets.
6.2 Password-based Authentication.
6.3 Secret Identifiers.
6.4 Secret Leakage.
6.5 Availability of Server-side Code.
6.7 Do You Want to Know More?
7. Enemies of Secure Code.
7.5 Closing Remarks.
7.6 Do You Want to Know More?
8. Summary of Rules for Secure Coding.
Appendix A: Bugs in the Web Server.
Appendix B: Packet Sniffing.
Appendix C: Sending HTML Formatted E-mails with Forged Sender Address.
Appendix D: More Information.