💥🔎 Unlock the Big Bugs: A Bug Hunter's Guide to IDORs & Zero-Click Takeovers! 🔐
Hey fellow hackers! 💻 Tired of finding low-impact bugs? Let's talk about the real prizes: Insecure Direct Object References (IDORs) and Zero-Click Account Takeovers. These aren't just bugs—they're masterclasses in broken logic. 🤯
Here's how to hunt them down and write a report that makes them pay big. 💰
Part 1: Hunting for IDORs 🎯
IDORs are all about a failure in authorization. The system knows who you are, but it forgets to ask: "Are you allowed to do that?"
Where to Find Them: 🗺️
Your best friend is your web proxy, like Burp Suite! 🕷️ Capture every request and look for these patterns:
URLs: Watch for easy-to-guess numbers or names.
https://site.com/orders?id=123https://site.com/user/aliceRequest Body: The ID could be hidden in JSON or form data.
{"user_id": 456, "action": "update"}Headers: Sometimes IDs are sent in special headers.
X-User-ID: 789The Hunting Method: A Step-by-Step Guide 🕵️♀️
Log in to Account A. 👱♀️ Perform an action that uses an ID.
Capture the request. 📸 Send it to your proxy's Repeater tool.
Identify Account A's ID. Find id=123.
Log in to Account B (or find a public ID). 🧑💼 Find their ID, like id=456.
Swap the IDs! 🔄 Change id=123 to id=456 in your captured request.
Send and See! 🚀
What to Look For: 🤔
🟢 200 OK with Account B's Data: You found it! This is a textbook IDOR.
🟡 200 OK, but your data: The system might be "self-correcting," but keep digging. There might be a bypass!
🔴 403 Forbidden: The developers did their job right here. Good for them! 👏
Part 2: Finding Zero-Click Account Takeovers 💥
This is the holy grail. 🏆 A zero-click takeover is when you can chain bugs to gain full account control without the victim doing anything. It's an IDOR on steroids!
Common Targets: 🎯
Password Reset Flows: The most common source of these bugs. Look for a predictable token or a way to redirect the reset to your own account.
Invitation Systems: Many platforms use invite links like invite?token=xyz. Can you use a valid token from your account with a victim's email?
Email Change Features: Can you update a victim's email address to your own without them verifying the change?
The key here is to look for where the application loses track of who owns a particular ID or token.
Part 3: Writing the Bug Report ✍️💰
A great bug report is the difference between an honest "thank you" and a hefty payout. Your goal is to make it impossible for them to say no.
Title: Make it impactful. [High] Zero-Click Account Takeover via IDOR in Password Reset
Description: A clear, one-paragraph summary. What happened, and what's the worst-case scenario?
Impact: Explain the real-world consequences. "Full account takeover, leading to data and financial theft."
Proof of Concept (PoC): This is the most important part! 🏆
Numbered Steps: Write a clear, simple list of instructions.
Screenshots: Include images for every step. Developers love this! 🖼️
cURL Commands: Provide the exact cURL commands you used. This lets them reproduce the bug instantly. ⚡
Remember, IDORs and zero-click bugs are high-impact because they break the fundamental trust between a user and an application. Go out there, find those predictable IDs, and get paid! 💸 Happy hunting! 🎉
More Tips for the Hunt 🧠
Look Beyond GET: Don't just check URLs. IDORs are often found in POST, PUT, and DELETE requests where you might be updating or deleting a resource. Always check the request body!
The Power of Permutations: If you find a vulnerable ID like user_id=123, also try other identifiers you might find on the page, like an email address or a username. A developer might have patched one reference but forgotten another.
Context is Everything: Think about what data an ID is connected to. If an ID is tied to a user, can you use it to access their profile, their photos, their orders, and their billing information? Test every endpoint!
Don't Forget the Details: Pay close attention to error messages. Sometimes a server will tell you exactly what's wrong, like "Invalid token for user ID 456." These clues can be gold for a zero-click attack.
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