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In hierdie POS sal 'n voorbeeld met behulp van `java.io.Serializable` verduidelik word.
# Serializable
Die Java `Serializable`-koppelvlak (`java.io.Serializable`) is 'n merkkoppelvlak wat jou klasse moet implementeer as dit **geserializeer** en **gedeserializeer** moet word. Java-objek-serialisering (skryf) word gedoen met die [ObjectOutputStream](http://tutorials.jenkov.com/java-io/objectoutputstream.html) en deserialisering (lees) word gedoen met die [ObjectInputStream](http://tutorials.jenkov.com/java-io/objectinputstream.html).
Kom ons kyk na 'n voorbeeld met 'n **klas Persoon** wat **serialiseerbaar** is. Hierdie klas **skryf die readObject-funksie oor**, sodat wanneer **enige objek** van hierdie **klas** **gedeserializeer** word, sal hierdie **funksie** uitgevoer word.\
In die voorbeeld roep die **readObject-funksie** van die Persoon-klas die funksie `eat()` van sy troeteldier aan en die funksie `eat()` van 'n Hond (om een of ander rede) roep 'n **calc.exe** aan. **Ons gaan sien hoe om 'n Persoon-objek te serialiseer en deserialiseer om hierdie sakrekenaar uit te voer:**
**Die volgende voorbeeld is vanaf [https://medium.com/@knownsec404team/java-deserialization-tool-gadgetinspector-first-glimpse-74e99e493649](https://medium.com/@knownsec404team/java-deserialization-tool-gadgetinspector-first-glimpse-74e99e493649)**
```java
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");
}
}
```
## Gevolgtrekking
Soos jy kan sien in hierdie baie basiese voorbeeld, kom die "kwesbaarheid" hier voor omdat die **readObject**-funksie **ander kwesbare funksies aanroep**.
Leer AWS-hacking van nul tot held met htARTE (HackTricks AWS Red Team Expert)!
Ander maniere om HackTricks te ondersteun:
* As jy jou **maatskappy geadverteer wil sien in HackTricks** of **HackTricks in PDF wil aflaai**, kyk na die [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Kry die [**amptelike PEASS & HackTricks-uitrusting**](https://peass.creator-spring.com)
* Ontdek [**The PEASS Family**](https://opensea.io/collection/the-peass-family), ons versameling eksklusiewe [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Sluit aan by die** 💬 [**Discord-groep**](https://discord.gg/hRep4RUj7f) of die [**telegram-groep**](https://t.me/peass) of **volg** ons op **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Deel jou haktruuks deur PR's in te dien by die** [**HackTricks**](https://github.com/carlospolop/hacktricks) en [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github-opslagplekke.