What is clone() Method Without super.clone() (CWE-580)?

TL;DR: clone() Method Without super.clone() (CWE-580) is a critical security flaw in Java applications that can cause unexpected object states and integrity issues. Fixing it involves ensuring proper use of super.clone().

What is clone() Method Without super.clone()?

clone() Method Without super.clone() (CWE-580) is a type of improper control of a resource through its lifetime vulnerability that occurs when the product contains a clone() method that does not call super.clone(). As defined by the MITRE Corporation under CWE-580, and classified by the OWASP Foundation under [mapping]…

Quick Summary

clone() Method Without super.clone() is a critical security flaw in Java applications. It can lead to unexpected object states, quality degradation, and integrity issues. Jump to: Overview · How it Works · Business Impact · Attack Scenario · Detection · Fixes

Jump to: Quick Summary · clone() Method Without super.clone() Overview · How clone() Method Without super.clone() Works · Business Impact of clone() Method Without super.clone() · clone() Method Without super.clone() Attack Scenario · How to Detect clone() Method Without super.clone() · How to Fix clone() Method Without super.clone() · Framework-Specific Fixes for clone() Method Without super.clone() · How to Ask AI to Check Your Code for clone() Method Without super.clone() · clone() Method Without super.clone() Best Practices Checklist · clone() Method Without super.clone() FAQ · Vulnerabilities Related to clone() Method Without super.clone() · References · Scan Your Own Site

clone() Method Without super.clone() Overview

What

clone() Method Without super.clone() is a type of improper control of a resource through its lifetime vulnerability.

Why it matters

This flaw can lead to unexpected object states, quality degradation, and integrity issues in Java applications.

Where it occurs

It occurs when a class implementing Cloneable does not properly call super.clone() within the clone method.

Who is affected

Java developers who implement cloning functionality without proper super.clone() calls are at risk.

Who is NOT affected

Developers using frameworks or libraries that handle object cloning internally and do not expose this vulnerability.

How clone() Method Without super.clone() Works

Root Cause

The root cause of the issue lies in a class implementing Cloneable but failing to call super.clone() within its own clone method. This results in an improperly initialized cloned object, leading to unexpected behavior.

Attack Flow

1. An attacker identifies a vulnerable Java application that improperly implements cloning.
2. The attacker exploits the vulnerability by invoking the clone() method without proper initialization.
3. The resulting cloned objects exhibit unexpected states and behaviors due to missing super.clone() calls.
4. This can lead to integrity issues, quality degradation, and potential security vulnerabilities.

Prerequisites to Exploit

• A Java application with a class implementing Cloneable but failing to call super.clone() within its clone method.
• The ability to invoke the clone() method on an object of this class.

Vulnerable Code

public class MyClass implements Cloneable {
    public Object clone() throws CloneNotSupportedException {
        // Missing super.clone()
        return new MyClass();
    }
}

This code does not properly initialize a cloned object, leading to unexpected behavior and integrity issues.

Secure Code

public class MyClass implements Cloneable {
    @Override
    protected Object clone() throws CloneNotSupportedException {
        // Properly call super.clone()
        return super.clone();
    }
}

By calling super.clone() within the clone method, the cloned object is properly initialized and avoids unexpected states.

Business Impact of clone() Method Without super.clone()

Integrity

• Data corruption due to improperly cloned objects.
• Unexpected system behavior leading to application instability.

Availability

• Decreased user trust and satisfaction due to perceived instability.

Financial

• Increased costs for debugging and fixing issues caused by improper cloning.
• Potential loss of business due to reputation damage from unstable applications.

clone() Method Without super.clone() Attack Scenario

1. An attacker identifies a Java application with improperly implemented cloning functionality.
2. The attacker exploits the vulnerability by invoking the clone() method on an object without proper initialization.
3. This results in cloned objects exhibiting unexpected states and behaviors, leading to data corruption or system instability.

How to Detect clone() Method Without super.clone()

Manual Testing

• Review source code for classes implementing Cloneable.
• Ensure super.clone() is called within the clone method.

Automated Scanners (SAST / DAST)

Static analysis can detect missing calls to super.clone(). Dynamic testing requires invoking the clone() method and observing unexpected behavior.

PenScan Detection

PenScan’s ZAP, Nuclei, Wapiti, Nikto, SSLyze, Dalfox, and Nmap engines actively test for this vulnerability.

False Positive Guidance

False positives may occur if the code is properly calling super.clone() but appears to be missing due to obfuscation or complex logic.

How to Fix clone() Method Without super.clone()

• Ensure your clone() method calls super.clone().
• Thoroughly test object cloning behavior after implementing this fix.
• Use unit tests and integration testing frameworks to validate the correctness of cloned objects.

Framework-Specific Fixes for clone() Method Without super.clone()

Java

public class MyClass implements Cloneable {
    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone();
    }
}

By properly calling super.clone() within the clone method, you ensure that cloned objects are initialized correctly.

How to Ask AI to Check Your Code for clone() Method Without super.clone()

clone() Method Without super.clone() Best Practices Checklist

✅ Ensure your clone() method calls super.clone().

✅ Thoroughly test object cloning behavior after implementing the fix.

✅ Use unit tests to validate the correctness of cloned objects.

✅ Document all changes made for future reference and auditing purposes.

✅ Educate developers on proper cloning techniques and best practices.

clone() Method Without super.clone() FAQ

How does the clone() method without super.clone() work?

The clone() method fails to call super.clone(), leading to unexpected object state and quality degradation.

Why is it important to prevent clone() Method Without super.clone() in Java applications?

It ensures proper control of objects throughout their lifecycle, preventing integrity issues and quality degradation.

Can you provide an example of vulnerable code for clone() Method Without super.clone()?

A class implementing Cloneable without calling super.clone() can lead to unexpected object states when cloned.

How do I detect clone() Method Without super.clone() in my Java application?

manual testing steps, automated scanning tools, and PenScan’s detection methods are all effective ways to identify this issue.

What is the impact of clone() Method Without super.clone() on business operations?

It can lead to unexpected system behavior, data corruption, and decreased user trust due to perceived instability.

How do I fix clone() Method Without super.clone() in my Java application?

Ensure that your clone() method calls super.clone() to properly initialize the cloned object’s state.

What are some best practices for preventing clone() Method Without super.clone()?

Always call super.clone() when implementing the clone() method and thoroughly test object cloning behavior.

Vulnerabilities Related to clone() Method Without super.clone()

References

• MITRE - CWE-580
• NVD

Scan Your Own Site

Manual code review catches what you know to look for. An automated scan catches what you didn’t. Scan your own website using PenScan to find clone() Method Without super.clone() and other risks before an attacker does.