TypeScript Snippet #07
This challenge covers the review of a snippet of code written in TypeScript
The Code Review Snippet challenge provides a small snippet of vulnerable code for review. Participants are encouraged to find the issue independently before watching the accompanying video for further insights. In this particular lab, the code initializes a web application using Express and Sequelize, defines User and Gift models, and includes a /claim endpoint where users can claim gifts by providing a UUID and an email address.
The primary vulnerability in this snippet is a race condition. When multiple requests with the same UUID but different email addresses are sent simultaneously, the backend does not lock the database to prevent the same gift from being claimed multiple times. This illustrates a classic race condition where concurrent operations lead to unintended behavior. Understanding and preventing such issues is essential for writing secure and reliable code.