AOC 2025 Day 20: Race Conditions - Toy to The World | Shield Security

🎄 Advent of Cyber 2025 – Race Conditions: Toy to The World

TBFC launched a limited-edition SleighToy with only 10 units available — yet somehow, more than 10 customers successfully checked out. Chaos followed. 🎁⚠️

In this walkthrough, we investigate how race conditions in web applications can be exploited when multiple requests hit the system at the same time, allowing attackers to bypass stock limits and manipulate transactions.

🧠 You’ll Learn:

📌 What race conditions are and why they happen
📌 How concurrent requests exploit timing flaws
📌 Manipulating stock/checkout logic via race conditions
📌 Simple mitigation techniques to prevent race condition bugs

A few milliseconds can decide everything — let’s see how timing broke Christmas shopping. ⏱️🎅

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