CWE

Common Weakness Enumeration

A Community-Developed List of Software Weakness Types

CWE/SANS Top 25 Most Dangerous Software Errors
Home > CWE List > CWE- Individual Dictionary Definition (3.0)  
ID

CWE-498: Cloneable Class Containing Sensitive Information

Weakness ID: 498
Abstraction: Variant
Structure: Simple
Status: Draft
Presentation Filter:
+ Description
The code contains a class with sensitive data, but the class is cloneable. The data can then be accessed by cloning the class.
+ Extended Description
Cloneable classes are effectively open classes, since data cannot be hidden in them. Classes that do not explicitly deny cloning can be cloned by any other class without running the constructor.
+ Relationships

The table(s) below shows the weaknesses and high level categories that are related to this weakness. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore.

+ Relevant to the view "Research Concepts" (CWE-1000)
NatureTypeIDName
ChildOfClassClass664Improper Control of a Resource Through its Lifetime
CanPrecedeClassClass200Information Exposure
+ Relevant to the view "Development Concepts" (CWE-699)
NatureTypeIDName
MemberOfCategoryCategory490Mobile Code Issues
CanPrecedeClassClass200Information Exposure
+ Modes Of Introduction

The different Modes of Introduction provide information about how and when this weakness may be introduced. The Phase identifies a point in the software life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase.

PhaseNote
Implementation
+ Applicable Platforms
The listings below show possible areas for which the given weakness could appear. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. The platform is listed along with how frequently the given weakness appears for that instance.

Languages

C++: (Undetermined Prevalence)

Java: (Undetermined Prevalence)

C#: (Undetermined Prevalence)

+ Common Consequences

The table below specifies different individual consequences associated with the weakness. The Scope identifies the application security area that is violated, while the Impact describes the negative technical impact that arises if an adversary succeeds in exploiting this weakness. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact.

ScopeImpactLikelihood
Access Control

Technical Impact: Bypass Protection Mechanism

A class that can be cloned can be produced without executing the constructor. This is dangerous since the constructor may perform security-related checks. By allowing the object to be cloned, those checks may be bypassed.
+ Likelihood Of Exploit
Medium
+ Demonstrative Examples

Example 1

The following example demonstrates the weakness.

(bad)
Example Language: Java 
public class CloneClient {
public CloneClient() //throws
java.lang.CloneNotSupportedException {

Teacher t1 = new Teacher("guddu","22,nagar road");
//...
// Do some stuff to remove the teacher.
Teacher t2 = (Teacher)t1.clone();
System.out.println(t2.name);

}
public static void main(String args[]) {

new CloneClient();

}

}
class Teacher implements Cloneable {

public Object clone() {

try {
return super.clone();

}
catch (java.lang.CloneNotSupportedException e) {

throw new RuntimeException(e.toString());

}

}
public String name;
public String clas;
public Teacher(String name,String clas) {

this.name = name;
this.clas = clas;

}

}

Make classes uncloneable by defining a clone function like:

(good)
Example Language: Java 
public final void clone() throws java.lang.CloneNotSupportedException {
throw new java.lang.CloneNotSupportedException();

}
+ Potential Mitigations

Phase: Implementation

If you do make your classes clonable, ensure that your clone method is final and throw super.clone().
+ Memberships
This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. This information is often useful in understanding where a weakness fits within the context of external information sources.
+ Taxonomy Mappings
Mapped Taxonomy NameNode IDFitMapped Node Name
CLASPInformation leak through class cloning
CERT Java Secure CodingOBJ07-JSensitive classes must not let themselves be copied
Software Fault PatternsSFP23Exposed Data
+ Content History
Submissions
Submission DateSubmitterOrganizationSource
CLASP
Modifications
Modification DateModifierOrganizationSource
2008-07-01Eric DalciCigital
updated Time_of_Introduction
2008-09-08CWE Content TeamMITRE
updated Applicable_Platforms, Common_Consequences, Description, Relationships, Other_Notes, Taxonomy_Mappings
2008-10-14CWE Content TeamMITRE
updated Other_Notes
2009-10-29CWE Content TeamMITRE
updated Common_Consequences, Description, Other_Notes, Potential_Mitigations
2011-03-29CWE Content TeamMITRE
updated Name
2011-06-01CWE Content TeamMITRE
updated Common_Consequences, Relationships, Taxonomy_Mappings
2012-05-11CWE Content TeamMITRE
updated Relationships, Taxonomy_Mappings
2014-07-30CWE Content TeamMITRE
updated Relationships, Taxonomy_Mappings
2017-11-08CWE Content TeamMITRE
updated Demonstrative_Examples, Potential_Mitigations, Relationships
Previous Entry Names
Change DatePrevious Entry Name
2011-03-29Information Leak through Class Cloning

More information is available — Please select a different filter.
Page Last Updated: November 14, 2017