Thread by @Aacle_

API-Security-Tips🌵

Old version of API tend to be more vulnerable

Saw a call to api/v3/login? Check api/v1/login exists as well It might be more vulnerable

#cybersecurity #hacking #bugbounty #bugbountytips #infosec #APIsecurity

API TIP: 1/10👇🏿✔

Never assume there’s only one way to authenticate to an API! Modern apps have many API endpoints for AuthN: /api/mobile/login | /api/v3/login | /api/magic_link; etc..

Find and test all of them for AuthN problems.

API TIP: 2/10👇🏿✔

SQL Injections used to be extremely common 5-10 years ago, and you could break almost every company?

BOLA (IDOR) is the new epidemic of API security.

As a pentester, if you understand how to exploit it, your glory is guaranteed.

medium.com/@inonst/a-deep…

API TIP: 3/10👇🏿✔

Testing a Ruby on Rails App & noticed an HTTP parameter containing a URL?

Developers sometimes use "Kernel#open" function to access URLs == Game Over.

Just send a pipe as the first character and then a shell command (Command Injection by design)

API TIP: 4/10👇🏿✔

Found SSRF? use it for:

Internal port scanning
Leverage cloud services(like 169.254.169.254)
Use webhook.site
to reveal IP Address & HTTP Library
Download a very large file (Layer 7 DoS)
Reflective SSRF? disclose local mgmt consoles

API TIP: 5/31 👇🏿✔

Mass Assignment is a real thing.

Modern frameworks encourage developers to use MA without understanding the security implications.

During exploitation, don't guess object's properties names, simply find a GET endpoint that returns all of them.

API TIP: 6/10👇🏿✔

A company exposes an API for developers?

This is not the same API which is used by mobile / web application.

Always test them separately.

Don't assume they implement the same security mechanisms.

API TIP: 7/10👇🏿✔

Pentest for REST API?

Give it a chance and check if the API supports SOAP also.

Change the content-type to "application/xml", add a simple XML in the request body, and see how the API handles it.

API TIP: 8/10 👇🏿✔

Pentest for APIs?

Trying to find BOLA (IDOR) vulnerabilities?

IDs in the HTTP bodies/headers tend to be more vulnerable than IDs in URLs. Try to focus on them first.

API TIP: 9/10👇🏿✔

The API uses Authorization header?

Forget about CSRF! If the authentication mechanism doesn't support cookies, the API is protected against CSRF by design.

Thank you for Reading These these thread
All credit Goes to
@traceableai

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API TIP: 10/10👇🏿✔