Serializable

Java Serializable 接口（java.io.Serializable 是一个标记接口，您的类必须实现它才能被 序列化 和 反序列化。Java 对象序列化（写入）是通过 ObjectOutputStream 完成的，反序列化（读取）是通过 ObjectInputStream 完成的。

让我们看一个 可序列化的类 Person 的示例。这个类 重写了 readObject 函数，因此当 这个类的任何对象 被 反序列化 时，这个函数将被执行。
在这个示例中，类 Person 的 readObject 函数 调用了它的宠物的 eat() 函数，而 Dog 的 eat() 函数（出于某种原因）调用了 calc.exe。 我们将看到如何序列化和反序列化一个 Person 对象以执行这个计算器：

以下示例来自 https://medium.com/@knownsec404team/java-deserialization-tool-gadgetinspector-first-glimpse-74e99e493649

import java.io.Serializable;
import java.io.*;

public class TestDeserialization {
interface Animal {
public void eat();
}
//Class must implements Serializable to be serializable
public static class Cat implements Animal,Serializable {
@Override
public void eat() {
System.out.println("cat eat fish");
}
}
//Class must implements Serializable to be serializable
public static class Dog implements Animal,Serializable {
@Override
public void eat() {
try {
Runtime.getRuntime().exec("calc");
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("dog eat bone");
}
}
//Class must implements Serializable to be serializable
public static class Person implements Serializable {
private Animal pet;
public Person(Animal pet){
this.pet = pet;
}
//readObject implementation, will call the readObject from ObjectInputStream  and then call pet.eat()
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException {
pet = (Animal) stream.readObject();
pet.eat();
}
}
public static void GeneratePayload(Object instance, String file)
throws Exception {
//Serialize the constructed payload and write it to the file
File f = new File(file);
ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(f));
out.writeObject(instance);
out.flush();
out.close();
}
public static void payloadTest(String file) throws Exception {
//Read the written payload and deserialize it
ObjectInputStream in = new ObjectInputStream(new FileInputStream(file));
Object obj = in.readObject();
System.out.println(obj);
in.close();
}
public static void main(String[] args) throws Exception {
// Example to call Person with a Dog
Animal animal = new Dog();
Person person = new Person(animal);
GeneratePayload(person,"test.ser");
payloadTest("test.ser");
// Example to call Person with a Cat
//Animal animal = new Cat();
//Person person = new Person(animal);
//GeneratePayload(person,"test.ser");
//payloadTest("test.ser");
}
}

结论

正如您在这个非常基本的示例中所看到的，这里的“漏洞”出现是因为 readObject 函数 调用了其他易受攻击的函数。

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Serializable

结论

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