API hacking
Compile a list of all APIs and conduct an analysis. Utilizing JavaScript can reveal additional APIs through brute-forcing files and parameters.
If the application's interface is not visible, delve into its JavaScript code.
The goal should extend beyond merely searching for vulnerabilities; keep a specific objective in mind.
Examine the source code for keywords such as GET, POST, and references to JavaScript. Utilize tools like JS Link Finder and Burp Suite plugins for JavaScript.
Create a mock API using tools like ChatGPT to generate dummy payloads.
Identify the application's features and analyze the JavaScript code associated with those features to understand its implementation. Then, create appropriate objects or data structures.
Employ tokens across various domains to gain access, discover development, QA, and other instances. Attempt to create accounts on these environments using APIs.
Use tools like ffuf to pinpoint the endpoints.
Develop a strategic plan for approaching the APIs.
Test functionalities for vulnerabilities such as Insecure Direct Object References (IDOR), sharing IDs, sharing user IDs, and URL leaks for sharing posts. Determine if such functionalities exist and how they can be exploited.
Example ffuf command:
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ffuf -w dirsearch-final.txt -u https://app-api.mu.ctfio.com/api/v1/FUZZ -H 'X-Api-Token: f8a9fd90496b91bf8bedf95e3851d752' -recursion
Review the API documentation thoroughly.
Identify which APIs are inaccessible due to 401 and 403 HTTP status codes for further investigation.
This revision aims to make the instructions more actionable and logically structured for someone looking to analyze and test APIs for security vulnerabilities.
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