BurpJDSer-ng

A Burp Extender plugin that deserializes Java objects and encodes them in XML using the XStream library.

Based in part on khai-tran's work but written from scratch to work with the new Montoya API.

Usage

1. Find and Download Client JAR Files

There are a few methods to locate the required JAR files containing the classes to be deserialized:

• If you have a .jnlp file, use jnpdownloader.
• Locate JAR files in the browser cache.
• Look for JAR files in Burp proxy history.

2. Start Burp Plugin

Download the plugin from the releases page and load it in the Extensions tab in Burp.

Use the JDSer tab to load the JAR files containing the classes you want to deserialize.

3. Inspect Serialized Java Traffic

Serialized Java content will automatically appear in the Java Object tab in appropriate locations (proxy history, interceptor, repeater, etc.). Any changes made to the XML will serialize back once you switch to a different tab or send the request.

If you get an error that a class was not found, you can add the JAR file containing that class in the JDSer tab and try again.