Potential security concern with Java interpreting JavaScript on the server side

Is there a security risk in evaluating Javascript code submitted from the browser on a server (Java webapp using Rhino Javascript Engine)?

The purpose of evaluating the JavaScript is simply to determine its validity.

No results are expected from the evaluation, and no data should be stored or manipulated. The only goal is to verify if valid JavaScript was submitted by the user.

If this process raises concerns about security, what measures can be taken to ensure that the JavaScript does not harm the system?

Answer №1

A potential risk arises due to the capability of JavaScript within Rhino to access any aspect of the Java runtime, such as the java.io classes.

To mitigate this risk, it is recommended to ensure that all interactions with Rhino are governed by a SecurityManager that imposes strict restrictions. While there may not be a built-in mechanism for this in JDK's ScriptEngine code, alternative solutions for managing security measures with Rhino and Mozilla hooks may exist.

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