When it comes to identifying race conditions and testing concurrency issues in APIs, Turbo Intruder is a must-have weapon in your offensive security toolkit. This powerful Burp Suite extension is built to launch blazing-fast HTTP requests—ideal for race condition exploits that require precise timing and volume.
Here’s a quick guide to getting started:
🛠️ Setting Up Turbo Intruder in Burp Suite
Step 1: Launch Burp Suite and go to the top menu → Extensions.
Step 2: In the Extensions tab, click BApp Store.
Step 3: Search for Turbo Intruder, then click Install.
⚙️ Running Your First Attack
Once installed, it’s time to get hands-on:
Select any API request in Burp’s HTTP history or Repeater.
Right-click the request → Navigate to Extensions > Turbo Intruder > Send to Turbo Intruder.
🧩 Customize the Request
Insert a %s token into any part of the request (e.g., a header or query parameter) where you want to inject payloads.
Scroll down to the scripting panel and modify the Python script to control how the payloads are fired—sequentially, concurrently, or in bursts.
💥 Launch the Attack
Click Attack to fire off the customized payloads at high speed.
Analyze the results to detect anomalies that signal race conditions or concurrency flaws.
🔍 Why Turbo Intruder?
Speed: It outpaces traditional Burp tools with asynchronous, multi-threaded requests.
Control: Fine-grained scripting lets you simulate real-world race conditions.
Visibility: Detailed results make it easier to identify timing-related bugs.
🧠 Pro Tip
Race conditions often result in subtle, non-deterministic behavior. Run attacks multiple times and compare response patterns. Look out for HTTP 409, duplicated resources, or unauthorized access anomalies.
Try it out and take your API security testing to the next level!
Let me know your experience with Turbo Intruder or drop your favorite race condition use case in the comments 👇
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