JAVA.CLASS.SER.DESER : Deserializable Class (Java)

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CodeSonar^® 9.2p0

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Java

JAVA.CLASS.SER.DESER : Deserializable Class (Java)

Summary

A class implements Serializable, which may allow adversaries to artificially forge objects from a byte array. This can be a security hazard since there is no control on the state of the new object.

Properties

Class Name

Deserializable Class (Java)

Significance

security

Mnemonic

JAVA.CLASS.SER.DESER

Example

// C.java
import java.io.Serializable;

public class C implements Serializable {    /* Deserializable Class (Java) warning issued here
                                             * C is explicitly serializable. 
                                             */ 
  private static final long serialVersionUID = 6045080196558799656L;
}

// D.java
public class D {}                           /* Deserializing Non-Serializable Class (Java) warning issued here
                                             * D is not explicitly serializable but does not implement a readObject() method. 
                                             */

// B.java
import java.io.ObjectInputStream;

public class B {                                                       // ok: not explicitly serializable, and implements readObject() method (which always throws an exception) 
  private void readObject(ObjectInputStream stream) {
        throw new RuntimeException("Deserialization is not allowed");
  }
}

In this example, the programmer should:

make class C non-serializable, and
in each of classes C and D, define a readObject() method that prevents deserialization, for example by always throwing an exception.

import java.io.Serializable;

public class C {
  private void readObject(ObjectInputStream stream) {
      throw new RuntimeException("Deserialization is not allowed");
  }
}

public class D {
  private void readObject(ObjectInputStream stream) {
      throw new RuntimeException("Deserialization is not allowed");
  }
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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