{"@ID": "498", "@Name": "Cloneable Class Containing Sensitive Information", "@Abstraction": "Variant", "@Structure": "Simple", "@Status": "Draft", "Description": "The code contains a class with sensitive data, but the class is cloneable. The data can then be accessed by cloning the class.", "Related_Weaknesses": {"Related_Weakness": [{"@Nature": "ChildOf", "@CWE_ID": "668", "@View_ID": "1000", "@Ordinal": "Primary"}, {"@Nature": "CanPrecede", "@CWE_ID": "200", "@View_ID": "1000"}]}, "Weakness_Ordinalities": {"Weakness_Ordinality": {"Ordinality": "Primary"}}, "Applicable_Platforms": {"Language": [{"@Class": "Object-Oriented", "@Prevalence": "Undetermined"}, {"@Name": "C++", "@Prevalence": "Undetermined"}, {"@Name": "Java", "@Prevalence": "Undetermined"}, {"@Name": "C#", "@Prevalence": "Undetermined"}]}, "Modes_Of_Introduction": {"Introduction": {"Phase": "Implementation"}}, "Likelihood_Of_Exploit": "Medium", "Common_Consequences": {"Consequence": {"Scope": ["Access Control", "Confidentiality"], "Impact": ["Bypass Protection Mechanism", "Read Application Data"], "Note": "A class that does not explicitly deny cloning can be cloned by any other class without running the constructor. Cloneable classes are effectively open classes, since data cannot be hidden in the. This is also dangerous since the constructor may perform security-related checks. By allowing the object to be cloned, those checks may be bypassed."}}, "Detection_Methods": {"Detection_Method": {"@Detection_Method_ID": "DM-14", "Method": "Automated Static Analysis", "Description": "Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect \"sources\" (origins of input) with \"sinks\" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)"}}, "Potential_Mitigations": {"Mitigation": {"Phase": "Implementation", "Description": "If you do make your classes clonable, ensure that your clone method is final and throw super.clone()."}}, "Demonstrative_Examples": {"Demonstrative_Example": {"Intro_Text": "The following example demonstrates the weakness.", "Example_Code": [{"@Nature": "Bad", "@Language": "Java", "xhtml:div": {"xhtml:div": [{"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": [null, null], "xhtml:div": [{"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": [null, null, null, null, null], "#text": "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);"}}, {"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": null, "#text": "new CloneClient();"}}], "#text": "public CloneClient() //throwsjava.lang.CloneNotSupportedException {}public static void main(String args[]) {}"}}, {"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": [null, null, null, null], "xhtml:div": [{"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": [null, null], "xhtml:div": [{"@style": "margin-left:1em;", "#text": "return super.clone();"}, {"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": null, "#text": "throw new RuntimeException(e.toString());"}}], "#text": "try {}catch (java.lang.CloneNotSupportedException e) {}"}}, {"@style": "margin-left:1em;", "xhtml:div": {"xhtml:br": [null, null], "#text": "this.name = name;this.clas = clas;"}}], "#text": "public Object clone() {}public String name;public String clas;public Teacher(String name,String clas) {}"}}], "xhtml:br": null, "#text": "public class CloneClient {}class Teacher implements Cloneable {}"}, "#text_blocks": ["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;", "}", "}"]}, {"@Nature": "Good", "@Language": "Java", "xhtml:div": {"xhtml:div": {"@style": "margin-left:1em;", "#text": "throw new java.lang.CloneNotSupportedException();"}, "#text": "public final void clone() throws java.lang.CloneNotSupportedException {}"}, "#text_blocks": ["public final void clone() throws java.lang.CloneNotSupportedException {", "throw new java.lang.CloneNotSupportedException();", "}"]}], "Body_Text": "Make classes uncloneable by defining a clone function like:"}}, "Taxonomy_Mappings": {"Taxonomy_Mapping": [{"@Taxonomy_Name": "CLASP", "Entry_Name": "Information leak through class cloning"}, {"@Taxonomy_Name": "The CERT Oracle Secure Coding Standard for Java (2011)", "Entry_ID": "OBJ07-J", "Entry_Name": "Sensitive classes must not let themselves be copied"}, {"@Taxonomy_Name": "Software Fault Patterns", "Entry_ID": "SFP23", "Entry_Name": "Exposed Data"}]}, "References": {"Reference": {"@External_Reference_ID": "REF-18"}}, "Mapping_Notes": {"Usage": "Allowed", "Rationale": "This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.", "Comments": "Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.", "Reasons": {"Reason": {"@Type": "Acceptable-Use"}}}, "Content_History": {"Submission": {"Submission_Name": "CLASP", "Submission_Date": "2006-07-19", "Submission_Version": "Draft 3", "Submission_ReleaseDate": "2006-07-19"}, "Modification": [{"Modification_Name": "Eric Dalci", "Modification_Organization": "Cigital", "Modification_Date": "2008-07-01", "Modification_Version": "1.0", "Modification_ReleaseDate": "2008-09-09", "Modification_Comment": "updated Time_of_Introduction"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2008-09-08", "Modification_Version": "1.0", "Modification_ReleaseDate": "2008-09-09", "Modification_Comment": "updated Applicable_Platforms, Common_Consequences, Description, Relationships, Other_Notes, Taxonomy_Mappings"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2008-10-14", "Modification_Version": "1.0.1", "Modification_ReleaseDate": "2008-10-14", "Modification_Comment": "updated Other_Notes"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2009-10-29", "Modification_Version": "1.6", "Modification_ReleaseDate": "2009-10-29", "Modification_Comment": "updated Common_Consequences, Description, Other_Notes, Potential_Mitigations"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2011-03-29", "Modification_Version": "1.12", "Modification_ReleaseDate": "2011-03-30", "Modification_Comment": "updated Name"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2011-06-01", "Modification_Version": "1.13", "Modification_ReleaseDate": "2011-06-01", "Modification_Comment": "updated Common_Consequences, Relationships, Taxonomy_Mappings"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2012-05-11", "Modification_Version": "2.2", "Modification_ReleaseDate": "2012-05-15", "Modification_Comment": "updated Relationships, Taxonomy_Mappings"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2014-07-30", "Modification_Version": "2.8", "Modification_ReleaseDate": "2014-07-31", "Modification_Comment": "updated Relationships, Taxonomy_Mappings"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2017-11-08", "Modification_Version": "3.0", "Modification_ReleaseDate": "2017-11-08", "Modification_Comment": "updated Demonstrative_Examples, Potential_Mitigations, Relationships"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2019-01-03", "Modification_Version": "3.2", "Modification_ReleaseDate": "2019-01-03", "Modification_Comment": "updated Relationships, Taxonomy_Mappings"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2020-02-24", "Modification_Version": "4.0", "Modification_ReleaseDate": "2020-02-24", "Modification_Comment": "updated References, Relationships"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2021-03-15", "Modification_Version": "4.4", "Modification_ReleaseDate": "2021-03-15", "Modification_Comment": "updated Relationships"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2023-04-27", "Modification_Version": "4.11", "Modification_ReleaseDate": "2023-04-27", "Modification_Comment": "updated Relationships"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2023-06-29", "Modification_Version": "4.12", "Modification_ReleaseDate": "2023-06-29", "Modification_Comment": "updated Mapping_Notes"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2025-12-11", "Modification_Version": "4.19", "Modification_ReleaseDate": "2025-12-11", "Modification_Comment": "updated Applicable_Platforms, Detection_Factors, Weakness_Ordinalities"}, {"Modification_Name": "CWE Content Team", "Modification_Organization": "MITRE", "Modification_Date": "2026-10-28", "Modification_Version": "5.0", "Modification_ReleaseDate": "2026-10-28", "Modification_Comment": "updated Common_Consequences, Description"}], "Previous_Entry_Name": {"@Date": "2011-03-29", "#text": "Information Leak through Class Cloning"}}, "entry_type": "Weakness"}