how to fix null dereference in java fortify

If Fortify SCA can be put into a pipeline, it can also be hooked to fix issues automatically (although care must be taken to avoid situations like the Debian OpenSSL PRNG vulnerability, which was not a vulnerability until a security-focused static code analyzer suggested a fix that ended up being July 2019. pylint. Null dereference is a common type of runtime failure in Java programs, and it is necessary to verify whether a dereference in the program is safe. If pthread_mutex_lock() cannot acquire the mutex for any reason, the function may introduce a race condition into the program and result in undefined behavior. We recently migrated our community to a new web platform and regretably the content for this page needed to be programmatically ported from its previous wiki page. An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. More information is available Please select a different filter. Harvest Property Management Lodi, Ca, . A null-pointer dereference takes place when a pointer with a value of NULL is used as though it pointed to a valid memory area. When to use LinkedList over ArrayList in Java? Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. OWASP, the OWASP logo, and Global AppSec are registered trademarks and AppSec Days, AppSec California, AppSec Cali, SnowFROC, and LASCON are trademarks of the OWASP Foundation, Inc. Explicitly initialize all your variables and other data stores, either during declaration or just before the first usage. Expressions (EXP), SEI CERT C Coding Standard - Guidelines 12. This table shows the weaknesses and high level categories that are related to this weakness. CODETOOLS-7900082 Fortify: Analize and fix "Missing Check against Null" issue CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues CODETOOLS-7900080 Fortify: Analize and fix "Log Forging" issues CODETOOLS-7900079 Fortify: Analize and fix "Code Correctness: Regular Expressions Denial of Service" issues But we have observed in practice that not every potential null dereference is a bug that developers want to fix. Variant - a weakness Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. Ensure that you account for all possible return values from the function. Fix : Analysis found that this is a false positive result; no code changes are required. Vulnerability In the following code, the programmer assumes that the system always has Apple. and Gary McGraw. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Object obj = new Object (); String text = obj.toString (); // 'obj' is dereferenced. The The play-webgoat repository contains an example web app that uses the Play framework. if statement; and unlock when it has finished. This Android application has registered to handle a URL when sent an intent: The application assumes the URL will always be included in the intent. When this method is called by a thread that is not the owner, the return value reflects a best-effort approximation of current lock status. CWE is sponsored by the U.S. Department of Homeland Security (DHS) Cybersecurity and Infrastructure Security Agency (CISA) and managed by the Homeland Security Systems Engineering and Development Institute (HSSEDI) which is operated by The MITRE Corporation (MITRE). Follows a very simple code sample that should reproduce the issue: public override bool Equals (object obj) { var typedObj = obj as SomeCustomClass; if (typedObj == null) return false; return this.Name == typedObj.Name; } In this simple excerpt Fortify complains that "typedObj" can be null in the return statement. "24 Deadly Sins of Software Security". A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. attacker might be able to use the resulting exception to bypass security This code will definitely crash due to a null pointer dereference in certain cases. View Defect : wazuh/ossec-wazuh: USE_AFTER_FREE: C/C++: Coverity's suggestion to fix this bug is to use a delete[] deallocator, but the concerned file is in Null Dereference. It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. More specific than a Pillar Weakness, but more general than a Base Weakness. Notice that the return value is not checked before the memcpy operation (CWE-252), so -1 can be passed as the size argument to memcpy() (CWE-805). This user is already logged in to another session. How can we prove that the supernatural or paranormal doesn't exist? Show activity on this post. I'm using "HP Fortify v3.50" on a java project and I find lots of false positive on "Null Dereference", because Fortify doesn't see the control against null is in another method. <. Unchecked return value leads to resultant integer overflow and code execution. PS: Yes, Fortify should know that these properties are secure. Only iterating over the list would be fine. Copyright 20062023, The MITRE Corporation. ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. Enter the username or e-mail you used in your profile. For example, if the program calls a function to drop privileges but does not check the return code to ensure that privileges were successfully dropped, then the program will continue to operate with the higher privileges. The following code does not check to see if the string returned by the Item property is null before calling the member function Equals(), potentially causing a NULL dereference. The Java VM sets them so, as long as Java isn't corrupted, you're safe. Program does not check return value when invoking functions to drop privileges, which could leave users with higher privileges than expected by forcing those functions to fail. The following code does not check to see if the string returned by getParameter() is null before calling the member function compareTo(), potentially causing a NULL dereference. The modules cover the full breadth and depth of topics for PCI Section 6.5 compliance and the items that are important for secure software development. David LeBlanc. What does this means in this context? "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". Expressions (EXP), SEI CERT C Coding Standard - Guidelines 03. Is a PhD visitor considered as a visiting scholar? In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. Category:Code Quality Team Collaboration and Endpoint Management. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? The program can dereference a null-pointer because it does not check the return value of a function that might return null. For trivial true positives, these are ones that just never need to be fixed. Fortify is complaining about a Null Dereference when I set a field to null: But that seems really silly. When it comes to these specific properties, you're safe. Poor code quality leads to unpredictable behavior. Network monitor allows remote attackers to cause a denial of service (crash) or execute arbitrary code via malformed packets that cause a NULL pointer dereference. An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. 2005-11-07. Browse other questions tagged java fortify or ask your own question. So mark them as Not an issue and move on. (where the weakness is a quality issue that might indirectly make it easier to introduce security-relevant weaknesses or make them more difficult to detect). How do I generate random integers within a specific range in Java? Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') -Wnull-dereference. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Category:Java My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? NULL pointer dereferences are frequently resultant from rarely encountered error conditions, since these are most likely to escape detection during the testing phases. Address the Null Dereference issues identified by the Fortify scan. The program can dereference a null-pointer because it does not check the return value of a function that might return null. So mark them as Not an issue and move on. The different Modes of Introduction provide information about how and when this weakness may be introduced. Most null pointer issues result in general software reliability problems, but if attackers can intentionally trigger a null pointer dereference, they can use the resulting exception to bypass security logic or to cause the application to reveal debugging information that will be valuable in planning subsequent attacks. Alternate Terms Relationships Closed. Without handling the error, there is no way to know. Take the following code: Integer num; num = new Integer(10); So you have a couple of choices: Ignore the warning. The modules cover the full breadth and depth of topics for PCI Section 6.5 compliance and the items that are important for secure software development. C#/VB.NET/ASP.NET. -Wnonnull-compare is included in -Wall. To learn more, see our tips on writing great answers. Fix: Added if block around the close call at line 906 to keep this from being . environment so that cmd is not defined, the program throws a null Find centralized, trusted content and collaborate around the technologies you use most. A Community-Developed List of Software & Hardware Weakness Types, Class: Not Language-Specific (Undetermined Prevalence), Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart. Category:Vulnerability. Show activity on this post. Category - a CWE entry that contains a set of other entries that share a common characteristic. There are some Fortify links at the end of the article for your reference. Fortify SCA is used to find and fix following software vulnerabilities at the root cause: Buffer Overflow, Command Injection, Cross-Site Scripting, Denial of Service, Format String, Integer Overflow, . If it does not exist, the program cannot perform the desired behavior so it doesn't matter whether I handle the error or allow the program to die dereferencing a null value." While there that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Expressions (EXP), https://samate.nist.gov/SSATTM_Content/papers/Seven%20Pernicious%20Kingdoms%20-%20Taxonomy%20of%20Sw%20Security%20Errors%20-%20Tsipenyuk%20-%20Chess%20-%20McGraw.pdf, https://www.microsoftpressstore.com/store/writing-secure-code-9780735617223, Cybersecurity and Infrastructure Security Agency, Homeland Security Systems Engineering and Development Institute, Detect and handle standard library errors, The CERT Oracle Secure Coding Standard for Java (2011), Provided Demonstrative Example and suggested CERT reference, updated Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings, updated Background_Details, Demonstrative_Examples, Description, Observed_Examples, Other_Notes, Potential_Mitigations, updated Common_Consequences, Demonstrative_Examples, References, updated Demonstrative_Examples, Potential_Mitigations, References, updated Demonstrative_Examples, References, updated Common_Consequences, Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Common_Consequences, References, Relationships, updated Demonstrative_Examples, Potential_Mitigations, updated Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Applicable_Platforms, References, Relationships, Taxonomy_Mappings, updated References, Relationships, Taxonomy_Mappings, updated Demonstrative_Examples, Observed_Examples, Relationships, Weakness_Ordinalities. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. String URL = intent.getStringExtra("URLToOpen"); race condition causes a table to be corrupted if a timer activates while it is being modified, leading to resultant NULL dereference; also involves locking. Java/JSP. I'd prefer to get rid of the finding vs. just write it off. Not the answer you're looking for? The method Equals() in MxRecord.cs can dereference a null pointer in c# how can we dereference pointer in javascript How Can I clones. Penticton Regional Hospital Diagnostic Imaging, Note that this code is also vulnerable to a buffer overflow . But, when you try to declare a reference type, something different happens. When to use LinkedList over ArrayList in Java? It works under 64-bit systems in Windows, Linux and macOS environments, and can analyze source code intended for 32-bit, 64-bit and embedded ARM platforms. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Take the following code: Integer num; num = new Integer(10); Cross-Client Data Access. For example, run the program under low memory conditions, run with insufficient privileges or permissions, interrupt a transaction before it is completed, or disable connectivity to basic network services such as DNS. If an attacker can control the programs Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The unary prefix ! It doesn't matter whether I handle the error or allow the program to die with a segmentation fault when it tries to dereference the null pointer." Dereference before null check. The Null dereference error was on the line of code sortName = lastName; not the call of the setter : fortify do not want you to conditionnally change the value of a variable that was set to null without doing so in all the branches. View - a subset of CWE entries that provides a way of examining CWE content. Fortify Null Dereference in Java; Chain Validation test; Apigee issue with PUT and POST operation; Query annotation not working with and / or operators; org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. Why are non-Western countries siding with China in the UN? Game allows remote attackers to cause a denial of service (server crash) via a missing argument, which triggers a null pointer dereference. Identify error conditions that are not likely to occur during normal usage and trigger them. a property named cmd defined. will be valuable in planning subsequent attacks. Demonstration method: public string DemonstrateNullConditional () { var maybeNull = GetSomethingThatMayBeNull (); if (maybeNull?.InstanceMember == "I wasn't null afterall.") { return maybeNull.OtherMember; } return "Oh, it was null"; } in the above example, the if clause is essentially equivalent to: The following code uses Java's SecureRandom class to generate a cryptographically strong pseudo-random number (DO THIS): public static int generateRandom (int maximumValue) { SecureRandom ranGen = new SecureRandom (); return ranGen.nextInt (maximumValue); } Edit on GitHub Null-pointer errors are usually the result of one or more programmer assumptions being violated. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution. 2006. Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. This argument ignores three important considerations: The following examples read a file into a byte array. Disadvantages Of Group Learning, java"HP Fortify v3.50""Null Dereference"Fortifynull. Connection conn = null; Boolean myConn = false; try { if (conn == null) { conn = DatabaseUtil.getConnection (); myConn = true; } result = DbClass.getObject (conn, otherParameters); }catch (DatabaseException de) { throw de; }catch (SQLException sqle) { throw new DatabaseException ("Error Message"); }finally { if (myConn && conn != null) { try { Pour adhrer l'association, rien de plus simple : une cotisation minimale de 1,50 est demande. They are not necessary and expose risk according to the Fortify scan. Instead use String.valueOf (object). Did the call to malloc() fail because req_size was too large or because there were too many requests being handled at the same time? Chain - a Compound Element that is a sequence of two or more separate weaknesses that can be closely linked together within software. The majority of true, relevant defects identified by Prevent were related to potential null dereference. language that is not susceptible to these issues. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Connect and share knowledge within a single location that is structured and easy to search. After the attack, the programmer's assumptions seem flimsy and poorly founded, but before an attack many programmers would defend their assumptions well past the end of their lunch break. NULL is used as though it pointed to a valid memory area. issues result in general software reliability problems, but if an Common Weakness Enumeration. <, [REF-961] Object Management Group (OMG). The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. We set fields to "null" in many places in our code and Fortify is good with that. Fix: Added if block around the close call at line 906 to keep this from being 3 FortifyJava 8 - Fortify : Null dereference for Java 8 Java 8 fortify Null Dereference null Common Weakness Enumeration. and Justin Schuh. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). vegan) just to try it, does this inconvenience the caterers and staff? Note that this code is also vulnerable to a buffer overflow (CWE-119). Unless otherwise specified, all content on the site is Creative Commons Attribution-ShareAlike v4.0 and provided without warranty of service or accuracy. even then, little can be done to salvage the process. Thanks for contributing an answer to Stack Overflow! Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. More specific than a Pillar Weakness, but more general than a Base Weakness. Alle links, video's en afbeeldingen zijn afkomstig van derden. The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. If you are working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the if statement; and unlock when it has finished. But if an I/O error occurs, fgets() will not null-terminate buf. I'm using "HP Fortify v3.50" on a java project and I find lots of false positive on "Null Dereference", because Fortify doesn't see the control against null is in another method. vegan) just to try it, does this inconvenience the caterers and staff? and John Viega. Removed issues. -Wnull-dereference. How do I connect these two faces together? SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. Category - a CWE entry that contains a set of other entries that share a common characteristic. public class MyClass {. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. The NULL pointer dereference weakness occurs where application dereferences a pointer that is expected to be a valid address but instead is equal to NULL. How to will fortify scan in eclipse Ace Madden. For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . environment, ensure that proper locking APIs are used to lock before the Addison Wesley. 3 FortifyJava 8 - Fortify : Null dereference for Java 8 Java 8 fortify Null Dereference null When working on a few Null Dereferencing warnings from Fortify, I was wondering if we could use standard .Net CodeContracts clauses to help Fortify in figuring out the exceptions. rev2023.3.3.43278. When this happens, CWE refers to X as "primary" to Y, and Y is "resultant" from X. This website uses cookies to analyze our traffic and only share that information with our analytics partners. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. I think I know why I'm getting it , just wanted to know what would be the best way to fix the issue. Follow Up: struct sockaddr storage initialization by network format-string. Mature pregnant Mom ass fucked by horny Stepson, Perfect Pussy cant Stop Squirting all over herself, Shokugeki no Soma Todokoro Megumi Hard Sex, naughty teen in sexy lace lingerie dancing and seducing boy sucking him and riding him hard amateur, Slutty wife Jayla de Angelis gets assfucked by the hung doctor in POV. ASCRM-CWE-252-data. Pillar - a weakness that is the most abstract type of weakness and represents a theme for all class/base/variant weaknesses related to it. Most appsec missions are graded on fixing app vulns, not finding them. Abstract. This weakness can be detected using dynamic tools and techniques that interact with the software using large test suites with many diverse inputs, such as fuzz testing (fuzzing), robustness testing, and fault injection. The programmer assumes that the files are always 1 kilobyte in size and therefore ignores the return value from Read(). Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. Deerlake Middle School Teachers, Giannini Guitar Model 2, If I had to guess, the tool you're using is complaining about our use of Math.random() but we don't rely on it being cryptographically secure. does pass the Fortify review. 2005-11-07. [1] J. Viega, G. McGraw Building Secure Software Addison-Wesley, [2] Standards Mapping - Common Weakness Enumeration, [3] Standards Mapping - Common Weakness Enumeration Top 25 2019, [4] Standards Mapping - Common Weakness Enumeration Top 25 2020, [5] Standards Mapping - Common Weakness Enumeration Top 25 2021, [6] Standards Mapping - Common Weakness Enumeration Top 25 2022, [7] Standards Mapping - DISA Control Correlation Identifier Version 2, [8] Standards Mapping - General Data Protection Regulation (GDPR), [9] Standards Mapping - NIST Special Publication 800-53 Revision 4, [10] Standards Mapping - NIST Special Publication 800-53 Revision 5, [11] Standards Mapping - OWASP Top 10 2004, [12] Standards Mapping - OWASP Application Security Verification Standard 4.0, [13] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [14] Standards Mapping - Security Technical Implementation Guide Version 3.1, [15] Standards Mapping - Security Technical Implementation Guide Version 3.4, [16] Standards Mapping - Security Technical Implementation Guide Version 3.5, [17] Standards Mapping - Security Technical Implementation Guide Version 3.6, [18] Standards Mapping - Security Technical Implementation Guide Version 3.7, [19] Standards Mapping - Security Technical Implementation Guide Version 3.9, [20] Standards Mapping - Security Technical Implementation Guide Version 3.10, [21] Standards Mapping - Security Technical Implementation Guide Version 4.1, [22] Standards Mapping - Security Technical Implementation Guide Version 4.2, [23] Standards Mapping - Security Technical Implementation Guide Version 4.3, [24] Standards Mapping - Security Technical Implementation Guide Version 4.4, [25] Standards Mapping - Security Technical Implementation Guide Version 4.5, [26] Standards Mapping - Security Technical Implementation Guide Version 4.6, [27] Standards Mapping - Security Technical Implementation Guide Version 4.7, [28] Standards Mapping - Security Technical Implementation Guide Version 4.8, [29] Standards Mapping - Security Technical Implementation Guide Version 4.9, [30] Standards Mapping - Security Technical Implementation Guide Version 4.10, [31] Standards Mapping - Security Technical Implementation Guide Version 4.11, [32] Standards Mapping - Security Technical Implementation Guide Version 5.1, [33] Standards Mapping - Web Application Security Consortium 24 + 2, [34] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.cpp.missing_check_against_null. Avoid Returning null from Methods. Fortify found 2 "Null Dereference" issues. Java (Undetermined Prevalence) C# (Undetermined Prevalence) Common Consequences. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Note that this code is also vulnerable to a buffer overflow (CWE-119). Or was it caused by a memory leak that has built up over time? <, [REF-962] Object Management Group (OMG). Connect and share knowledge within a single location that is structured and easy to search. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Monitor the software for any unexpected behavior. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. Requirements specification: The choice could be made to use a All rights reserved. How do I align things in the following tabular environment? Network monitor allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. failure of the process. void host_lookup(char *user_supplied_addr){, if("com.example.URLHandler.openURL".equals(intent.getAction())) {. how to fix null dereference in java fortify how to fix null dereference in java fortify . Bny Mellon Layoffs 2021, We nemen geen verantwoordelijkheid voor de inhoud van een website waarnaar we linken, gebruik je eigen goeddunken tijdens het surfen op de links. Does a summoned creature play immediately after being summoned by a ready action? How to tell Jackson to ignore a field during serialization if its value is null? Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. When designing a function, make sure you return a value or throw an exception in case of an error. Why are trials on "Law & Order" in the New York Supreme Court? It is important to remember here to return the literal and not the char being checked. If there is a more properplace to file these types of bugs feel free to share and I'll proceed to file the bug there. Improper Check for Unusual or Exceptional Conditions, Error Conditions, Return Values, Status Codes, OWASP Top Ten 2004 Category A7 - Improper Error Handling, CERT C Secure Coding Standard (2008) Chapter 9 - Memory Management (MEM), The CERT Oracle Secure Coding Standard for Java (2011) Chapter 4 - Expressions (EXP), CERT C++ Secure Coding Section 08 - Memory Management (MEM), SFP Secondary Cluster: Unchecked Status Condition, CISQ Quality Measures (2016) - Reliability, SEI CERT Oracle Secure Coding Standard for Java - Guidelines 02.