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Contents in Detail
1. Cover Page
2. Title Page
3. Copyright Page
4. About the Author
5. About the Technical Reviewer
6. Brief Contents
7. Contents in Detail
8. Foreword by Michiel Prins and Jobert Abma
9. Acknowledgments
10. Introduction

1. Who Should Read This Book

2. How to Read This Book
3. What’s in This Book
4. A Disclaimer About Hacking

11. 1 Bug Bounty Basics

1. Vulnerabilities and Bug Bounties

2. Client and Server
3. What Happens When You Visit a Website
4. HTTP Requests
5. Summary

12. 2 Open Redirect

1. How Open Redirects Work

2. Shopify Theme Install Open Redirect
3. Shopify Login Open Redirect
4. HackerOne Interstitial Redirect
5. Summary
13. 3 HTTP Parameter Pollution

1. Server-Side HPP
2. Client-Side HPP
3. HackerOne Social Sharing Buttons
4. Twitter Unsubscribe Notifications
5. Twitter Web Intents
6. Summary

14. 4 Cross-Site Request Forgery

1. Authentication
2. CSRF with GET Requests
3. CSRF with POST Requests
4. Defenses Against CSRF Attacks
5. Shopify Twitter Disconnect
6. Change Users Instacart Zones
7. Badoo Full Account Takeover
8. Summary

15. 5 HTML Injection and Content Spoofing

1. Coinbase Comment Injection Through Character Encoding

2. HackerOne Unintended HTML Inclusion
3. HackerOne Unintended HTML Include Fix Bypass
4. Within Security Content Spoofing
5. Summary

16. 6 Carriage Return Line Feed Injection

1. HTTP Request Smuggling

2. v.shopify.com Response Splitting
3. Twitter HTTP Response Splitting
4. Summary

17. 7 Cross-Site Scripting

 1. Types of XSS
2. Shopify Wholesale
3. Shopify Currency Formatting
4. Yahoo! Mail Stored XSS
5. Google Image Search
6. Google Tag Manager Stored XSS
7. United Airlines XSS
8. Summary

18. 8 Template Injection

1. Server-Side Template Injections

2. Client-Side Template Injections
3. Uber AngularJS Template Injection
4. Uber Flask Jinja2 Template Injection
5. Rails Dynamic Render
6. Unikrn Smarty Template Injection
7. Summary

19. 9 SQL Injection

1. SQL Databases
2. Countermeasures Against SQLi
3. Yahoo! Sports Blind SQLi
4. Uber Blind SQLi
5. Drupal SQLi
6. Summary

20. 10 Server-Side Request Forgery

1. Demonstrating the Impact of Server-Side Request Forgery

2. Invoking GET vs. POST Requests
3. Performing Blind SSRFs
4. Attacking Users with SSRF Responses
5. ESEA SSRF and Querying AWS Metadata
6. Google Internal DNS SSRF
7. Internal Port Scanning Using Webhooks
8. Summary
21. 11 XML External Entity

1. eXtensible Markup Language

2. How XXE Attacks Work
3. Read Access to Google
4. Facebook XXE with Microsoft Word
5. Wikiloc XXE
6. Summary

22. 12 Remote Code Execution

1. Executing Shell Commands

2. Executing Functions
3. Strategies for Escalating Remote Code Execution
4. Polyvore ImageMagick
5. Algolia RCE on facebooksearch.algolia.com
6. RCE Through SSH
7. Summary

23. 13 Memory Vulnerabilities

1. Buffer Overflows
2. Read Out of Bounds
3. PHP ftp_genlist() Integer Overflow
4. Python Hotshot Module
5. Libcurl Read Out of Bounds
6. Summary

24. 14 Subdomain Takeover

1. Understanding Domain Names

2. How Subdomain Takeovers Work
3. Ubiquiti Subdomain Takeover
4. Scan.me Pointing to Zendesk
5. Shopify Windsor Subdomain Takeover
6. Snapchat Fastly Takeover
7. Legal Robot Takeover
8. Uber SendGrid Mail Takeover
 9. Summary

25. 15 Race Conditions

1. Accepting a HackerOne Invite Multiple Times

2. Exceeding Keybase Invitation Limits
3. HackerOne Payments Race Condition
4. Shopify Partners Race Condition
5. Summary

26. 16 Insecure Direct Object References

1. Finding Simple IDORs

2. Finding More Complex IDORs
3. Binary.com Privilege Escalation
4. Moneybird App Creation
5. Twitter Mopub API Token Theft
6. ACME Customer Information Disclosure
7. Summary

27. 17 OAuth Vulnerabilities

1. The OAuth Workflow

2. Stealing Slack OAuth Tokens
3. Passing Authentication with Default Passwords
4. Stealing Microsoft Login Tokens
5. Swiping Facebook Official Access Tokens
6. Summary

28. 18 Application Logic and Configuration Vulnerabilities

1. Bypassing Shopify Administrator Privileges

2. Bypassing Twitter Account Protections
3. HackerOne Signal Manipulation
4. HackerOne Incorrect S3 Bucket Permissions
5. Bypassing GitLab Two-Factor Authentication
6. Yahoo! PHP Info Disclosure
 7. HackerOne Hacktivity Voting
8. Accessing PornHub’s Memcache Installation
9. Summary

29. 19 Finding Your Own Bug Bounties

1. Reconnaissance
2. Testing the Application
3. Going Further
4. Summary

30. 20 Vulnerability Reports

1. Read the Policy

2. Include Details; Then Include More
3. Reconfirm the Vulnerability
4. Your Reputation
5. Show Respect for the Company
6. Appealing Bounty Rewards
7. Summary

31. A Tools

1. Web Proxies
2. Subdomain Enumeration
3. Discovery
4. Screenshotting
5. Port Scanning
6. Reconnaissance
7. Hacking Tools
8. Mobile
9. Browser Plug-Ins

32. B Resources

1. Online Training
2. Bug Bounty Platforms
 3. Recommended Reading
4. Video Resources
5. Recommended Blogs

33. Index
REAL-WORLD BUG
HUNTING
A Field Guide to Web Hacking

by Peter Yaworski

San Francisco
REAL-WORLD BUG HUNTING. Copyright © 2019 by Peter Yaworski.

All rights reserved. No part of this work may be reproduced or transmitted in any
form or by any means, electronic or mechanical, including photocopying,
recording, or by any information storage or retrieval system, without the prior
written permission of the copyright owner and the publisher.

ISBN-10: 1-59327-861-6
ISBN-13: 978-1-59327-861-8

Publisher: William Pollock

Production Editor: Janelle Ludowise
Cover Illustration: Jonny Thomas
Interior Design: Octopod Studios
Developmental Editors: Jan Cash and Annie Choi
Technical Reviewer: Tsang Chi Hong
Copyeditor: Anne Marie Walker
Compositor: Happenstance Type-O-Rama
Proofreader: Paula L. Fleming
Indexer: JoAnne Burek

For information on distribution, translations, or bulk sales, please contact No Starch

Press, Inc. directly:
No Starch Press, Inc.
245 8th Street, San Francisco, CA 94103
phone: 1.415.863.9900; info@nostarch.com
www.nostarch.com

Library of Congress Cataloging-in-Publication Data

Names: Yaworski, Peter, author.

Title: Real-world bug hunting : a field guide to web hacking / Peter Yaworski.
Description: San Francisco : No Starch Press, 2019. | Includes
bibliographical references.
Identifiers: LCCN 2018060556 (print) | LCCN 2019000034 (ebook) | ISBN
9781593278625 (epub) | ISBN 1593278624 (epub) | ISBN 9781593278618
(paperback) | ISBN 1593278616 (paperback)
Subjects: LCSH: Debugging in computer science. | Penetration testing
 (Computer security) | Web sites--Testing. | BISAC: COMPUTERS / Security /
Viruses. | COMPUTERS / Security / General. | COMPUTERS / Networking /
Security.
Classification: LCC QA76.9.D43 (ebook) | LCC QA76.9.D43 Y39 2019 (print) |
DDC 004.2/4--dc23
LC record available at https://lccn.loc.gov/2018060556

No Starch Press and the No Starch Press logo are registered trademarks of No
Starch Press, Inc. Other product and company names mentioned herein may be the
trademarks of their respective owners. Rather than use a trademark symbol with
every occurrence of a trademarked name, we are using the names only in an
editorial fashion and to the benefit of the trademark owner, with no intention of
infringement of the trademark.

The information in this book is distributed on an “As Is” basis, without warranty.
While every precaution has been taken in the preparation of this work, neither the
author nor No Starch Press, Inc. shall have any liability to any person or entity with
respect to any loss or damage caused or alleged to be caused directly or indirectly
by the information contained in it.
About the Author
Peter Yaworski is a self-taught hacker thanks to the generous
knowledge sharing of so many hackers who came before him,
including those referenced in this book. He is also a successful
bug bounty hunter with thanks from Salesforce, Twitter,
Airbnb, Verizon Media, and the United States Department of
Defense, among others. He currently works at Shopify as an
Application Security Engineer, helping to make commerce
more secure.
About the Technical Reviewer
Tsang Chi Hong, also known as FileDescriptor, is a pentester
and a bug bounty hunter. He lives in Hong Kong. He writes
about web security at https://blog.innerht.ml, enjoys listening
to original soundtracks, and owns some cryptocurrencies.
 BRIEF CONTENTS
Foreword by Michiel Prins and Jobert Abma

Acknowledgments

Introduction

Chapter 1: Bug Bounty Basics

Chapter 2: Open Redirect

Chapter 3: HTTP Parameter Pollution

Chapter 4: Cross-Site Request Forgery

Chapter 5: HTML Injection and Content Spoofing

Chapter 6: Carriage Return Line Feed Injection

Chapter 7: Cross-Site Scripting

Chapter 8: Template Injection

Chapter 9: SQL Injection

Chapter 10: Server-Side Request Forgery

Chapter 11: XML External Entity

Chapter 12: Remote Code Execution

Chapter 13: Memory Vulnerabilities

Chapter 14: Subdomain Takeover

Chapter 15: Race Conditions

Chapter 16: Insecure Direct Object References

Chapter 17: OAuth Vulnerabilities

Chapter 18: Application Logic and Configuration

Vulnerabilities

Chapter 19: Finding Your Own Bug Bounties

Chapter 20: Vulnerability Reports

Appendix A: Tools

Appendix B: Resources

Index
 CONTENTS IN DETAIL
FOREWORD by Michiel Prins and Jobert Abma

ACKNOWLEDGMENTS

INTRODUCTION
Who Should Read This Book
How to Read This Book
What’s in This Book
A Disclaimer About Hacking

1
BUG BOUNTY BASICS
Vulnerabilities and Bug Bounties
Client and Server
What Happens When You Visit a Website
Step 1: Extracting the Domain Name
Step 2: Resolving an IP Address
Step 3: Establishing a TCP Connection
Step 4: Sending an HTTP Request
Step 5: Server Response
Step 6: Rendering the Response
HTTP Requests
Request Methods
HTTP Is Stateless
Summary
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