Signing Oracle

This exercise covers the concept of a signing oracle, where a web application uses the same method and secret to sign data in different parts of the application. The goal is to demonstrate how this reuse can lead to security vulnerabilities. By manipulating the signing process, you can generate signed tokens that allow access to unauthorized information, similar to an Insecure Direct Object Reference (IDOR) attack.

You will start by understanding how the application uses signing to protect sensitive information, such as user sessions or identifiers. By leveraging this knowledge, you will exploit the signing oracle to access restricted resources. The exercise emphasizes the importance for developers to avoid reusing the same signing methods and secrets across different parts of an application to prevent such vulnerabilities.