As we discussed previously, none of the inputs available to you need to state that the application accepts XML for a service to be vulnerable to XXE: the XML parsing layer of the application could be opaque to you, stitching together data that you sent as a GET or POST request into an XML document.
Besides services that use XML as their primary document formatting system under-the-hood, there are also many API services that support different data formats by default. Even if you're making a GET request and receiving JSON in return, you can test whether or not that API endpoint can format your request as XML by trying the XML content header, that is, Content-Type: application/xml. Because services often have this capacity to switch between different content types that are built-in, the owner of the service might...
Hands-On Bug Hunting for Penetration Testers
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Hands-On Bug Hunting for Penetration Testers
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Overview of this book
Bug bounties have quickly become a critical part of the security economy. This book shows you how technical professionals with an interest in security can begin productively—and profitably—participating in bug bounty programs.
You will learn about SQli, NoSQLi, XSS, XXE, and other forms of code injection. You’ll see how to create CSRF PoC HTML snippets, how to discover hidden content (and what to do with it once it’s found), and how to create the tools for automated pentesting work?ows.
Then, you’ll format all of this information within the context of a bug report that will have the greatest chance of earning you cash.
With detailed walkthroughs that cover discovering, testing, and reporting vulnerabilities, this book is ideal for aspiring security professionals. You should come away from this work with the skills you need to not only find the bugs you're looking for, but also the best bug bounty programs to participate in, and how to grow your skills moving forward in freelance security research.
Table of Contents (16 chapters)
Preface
Free Chapter
Joining the Hunt
Choosing Your Hunting Ground
Preparing for an Engagement
Unsanitized Data – An XSS Case Study
SQL, Code Injection, and Scanners
CSRF and Insecure Session Authentication
Detecting XML External Entities
Access Control and Security Through Obscurity
Framework and Application-Specific Vulnerabilities
Formatting Your Report
Other Tools
Other (Out of Scope) Vulnerabilities
Going Further
Assessment
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