Original Post: Prototype Pollution Proof of Concept | by Tal Sperling | Jun, 2024
The content discusses prototype pollution, starting with an explanation of JavaScript prototype objects and the prototype chain mechanism. It provides a simple example illustrating how properties and functions can be added to an object’s prototype.
Prototype pollution is described as a vulnerability where attackers manipulate the prototype object, injecting or modifying properties that can be inherited by all objects. This often occurs when merging or extending objects without proper validation of the keys, allowing attackers to introduce or alter properties on the prototype chain, leading to potential security issues.
An example application simulating real-world scenarios is presented, with a portal and a microservice for a car sales company. The microservice interacts with the portal via an API, fetching user data and logging it. The illustration highlights how certain properties like ‘admin’ are not part of the object initially but could be manipulated.
The document concludes with an example of fuzzing the app, leading to unauthorized access to an admin page and potential user data updates, emphasizing the importance of security in handling prototype properties.
Go here to read the Original Post