Code Injection Affecting crossbow-lang package, versions *
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Test your applications- Snyk ID npm:crossbow-lang:20160819
- published 18 Sep 2016
- disclosed 9 Jan 2015
How to fix?
Latest release (v1.0.0) is vulnerable, so we suggest to avoid using it altogether, until a patch is made available.
Overview
crossbow-lang is an unmaintaned fork of dustjs-linkedin, a Javascript templating engine designed to run asynchronously on both the server and the browser. It is vulnerable to the same Code Injection vulnerability as Dust.js
Dust.js uses Javascript's eval() function to evaluate the "if" statement conditions. The input to the function is sanitized by escaping all potentially dangerous characters.
However, if the variable passed in is an array, no escaping is applied, exposing an easy path to code injection. The risk of exploit is especially high given the fact express, koa and many other Node.js servers allow users to force a query parameter to be an array using the param[]=value notation.