Listen to this Post
Introduction:
In the dynamic world of bug bounty hunting, logic flaws often yield the most critical rewards. A recent P1 (Priority 1) critical vulnerability, known as “Price Tampering,” allowed a security researcher to manipulate transaction values, leading to a substantial bounty within a single day. This incident underscores a pervasive threat in e-commerce and financial applications where business logic, rather than complex code, becomes the weakest link. Understanding and exploiting these flaws is a cornerstone of advanced ethical hacking.
Learning Objectives:
- Understand the fundamental mechanics of price tampering and parameter manipulation vulnerabilities.
- Learn a methodological approach to test for price tampering in web and API applications.
- Master the tools and techniques for both manual discovery and automated exploitation of business logic flaws.
You Should Know:
- Deconstructing Price Tampering: More Than Just a Number
Price tampering is a client-side business logic vulnerability where an attacker intercepts and modifies transaction parameters—such as price, quantity, discount code, or currency—before the request is sent to the server. The critical failure occurs when the server trusts these client-submitted values without rigorous re-validation against the authoritative source (e.g., its own database).
Step‑by‑step guide explaining what this does and how to use it.
– Step 1: Reconnaissance & Mapping. Identify all endpoints handling transactions. Use browser Developer Tools (F12 -> Network tab) during a mock purchase to monitor all `POST` and `GET` requests. Tools like Burp Suite or OWASP ZAP can proxy this traffic for deeper inspection.
– Step 2: Parameter Identification. Key parameters to target include price, total, amount, quantity, coupon_value, currency, and product_id. Look for these in JSON payloads, form data, or URL query strings.
– Step 3: Initial Probe. Send a request to the server, then re-send it after modification. A simple Linux `curl` command can test an API endpoint:
Original Request
curl -X POST 'https://target.com/api/checkout' -H 'Content-Type: application/json' --data-raw '{"product_id": "A123", "price": 100, "quantity": 1}'
Tampered Request
curl -X POST 'https://target.com/api/checkout' -H 'Content-Type: application/json' --data-raw '{"product_id": "A123", "price": 1, "quantity": 1}'
Observe if the server accepts the modified price or responds with the corrected total.
- The Art of Manual Testing: Interception and Manipulation
Manual testing provides the nuance needed to understand application flow. Using an intercepting proxy is non-negotiable.
Step‑by‑step guide explaining what this does and how to use it.
– Step 1: Configure Your Proxy. Set your browser to use Burp Suite (commonly on `127
▶️ Related Video (70% Match):
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Vikas Gupta63 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
