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. PS: Yes, Fortify should know that these properties are secure. 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." Unless otherwise specified, all content on the site is Creative Commons Attribution-ShareAlike v4.0 and provided without warranty of service or accuracy. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. The method isXML () in jquery-1.4.4.js can dereference a null pointer on line 4283, thereby raising a NullExcpetion. (Or use the ternary operator if you prefer). It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. What does this means in this context? 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, (Java) and to compare it with existing bug reports on the tool to test its efficacy. 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. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called. 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. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. Base - a weakness 5.2 (2018-02-26) Fix #298: Fortify Issue: Unreleased Resource; Fix #286: HTML 5.0 Report: Add method and class of the failing test; Fix #287: Add cite:testSuiteType earl property to identify the test-suite is implemented using ctl or testng. The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. 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. and Justin Schuh. The following code does not check to see if memory allocation succeeded before attempting to use the pointer returned by malloc(). Show activity on this post. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. Content Provider URI Injection. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. Browse other questions tagged java fortify or ask your own question. View - a subset of CWE entries that provides a way of examining CWE content. How can we prove that the supernatural or paranormal doesn't exist? . 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. "Sin 11: Failure to Handle Errors Correctly." Fortify found 2 "Null Dereference" issues. Chains can involve more than two weaknesses, and in some cases, they might have a tree-like structure. This argument ignores three important considerations: The following examples read a file into a byte array. Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. The SAST tool used was Fortify SCA, (and obviously if httpInputStream is different from null, to avoid a possible Null Dereference by invoking the close() method). Addison Wesley. 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. If an attacker can control the program's environment so that "cmd" is not defined, the program throws a NULL pointer exception when it attempts to call the trim() method. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. "Automated Source Code Reliability Measure (ASCRM)". Anyone have experience with this one? operator is the null-forgiving, or null-suppression, operator. <, [REF-962] Object Management Group (OMG). Most errors and unusual events in Java result in an exception being thrown. attacker can intentionally trigger a null pointer dereference, the 2019-07-15. ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. If an attacker can force the function to fail or otherwise return a value that is not expected, then the subsequent program logic could lead to a vulnerability, because the product is not in a state that the programmer assumes. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Time arrow with "current position" evolving with overlay number, Doubling the cube, field extensions and minimal polynoms. This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. The program can dereference a null-pointer because it does not check the return value of a function that might return null. (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) We recreated the patterns in a small tool and then performed comparative analysis. 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. Palash Sachan 8-Feb-17 13:41pm. 2016-01. Category:Vulnerability. Most appsec missions are graded on fixing app vulns, not finding them. Denial of service Flooding Resource exhaustion Sustained client engagement Denial of service problems in C# Infinite loop Economic Denial of Sustainability (EDoS) Amplification Other amplification examples There are too few details in this report for us to be able to work on it. 10 Avoiding Attempt to Dereference Null Object Errors - YouTube 0:00 / 8:00 10 Avoiding Attempt to Dereference Null Object Errors 4,029 views Oct 22, 2014 In this episode we look at 3 common. report. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. ASCRM-CWE-252-resource. If you can guaranty this, then the empty List is even better, as it does not create a new object all the time. When you assign the value of 10 on the second line, your value of 10 is written into the memory location referred to by x. Ie, do you want to know how to fix a vulnerability (this is well-covered, and you should do some research before asking a more concrete question), or do you want to know how to suppress a false-positive (this would likely be off-topic, you should just ask the vendor)? 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). David LeBlanc. But, when you try to declare a reference type, something different happens. 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. that is linked to a certain type of product, typically involving a specific language or technology. Does a barbarian benefit from the fast movement ability while wearing medium armor? Concatenating a string with null is safe. 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. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. 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. will be valuable in planning subsequent attacks. Why are non-Western countries siding with China in the UN? Theres still some work to be done. It is the same class, @SnakeDoc I'm guessing the OP messed up their. language that is not susceptible to these issues. This user is already logged in to another session. The stream and reader classes do not consider it to be unusual or exceptional if only a small amount of data becomes available. even then, little can be done to salvage the process. <, [REF-1031] "Null pointer / Null dereferencing". Dereference before null check (REVERSE_INULL) There may be a null pointer exception, or else the comparison against null is unnecessary. If an attacker provides an address that appears to be well-formed, but the address does not resolve to a hostname, then the call to gethostbyaddr() will return NULL. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. 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. Fix: Commented out the debug lines to the logger. PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. For trivial true positives, these are ones that just never need to be fixed. Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. Page 183. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-a The platform is listed along with how frequently the given weakness appears for that instance. public class MyClass {. In both of these situations, fgets() signals that something unusual has happened by returning NULL, but in this code, the warning will not be noticed. how to fix null dereference in java fortify how to fix null dereference in java fortify . Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Null-pointer errors are usually the result of one or more programmer assumptions being violated. NULL is used as though it pointed to a valid memory area. Before using a pointer, ensure that it is not equal to NULL: When freeing pointers, ensure they are not set to NULL, and be sure to Explicitly initialize all your variables and other data stores, either during declaration or just before the first usage. Monitor the software for any unexpected behavior. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. Thanks for the input! The program can dereference a null-pointer because it does not check the return value of a function that might return null. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. Enter the username or e-mail you used in your profile. 2016-01. It is impossible for the program to perform a graceful exit if required. The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Compliance Failure. This listing shows possible areas for which the given weakness could appear. Il suffit de nous contacter ! Category:Code Quality 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. junio 12, 2022. abc news anchors female philadelphia . Clark Atlanta University Music Department, A method returning a List should per convention never return null but an empty List as default "empty" value. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. A Community-Developed List of Software & Hardware Weakness Types, Class: Not Language-Specific (Undetermined Prevalence), Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart. 2nd Edition. Is there a single-word adjective for "having exceptionally strong moral principles"? The following function attempts to acquire a lock in order to perform operations on a shared resource. This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. To learn more, see our tips on writing great answers. Wij hebben geen controle over de inhoud van deze sites. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. steps will go a long way to ensure that null-pointer dereferences do not Use automated static analysis tools that target this type of weakness. Class - a weakness that is described in a very abstract fashion, typically independent of any specific language or technology. The unary prefix ! From a user's perspective that often manifests itself as poor usability. Unchecked return value leads to resultant integer overflow and code execution. The different Modes of Introduction provide information about how and when this weakness may be introduced. Agissons ici, pour que a change l-bas ! Asking for help, clarification, or responding to other answers. Redundant Null Check. 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. This table specifies different individual consequences associated with the weakness. Convert byte[] to String (text data) The below example convert a string to a byte array or byte[] and vice versa. vegan) just to try it, does this inconvenience the caterers and staff? Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. caught at night in PUBLIC POOL!!! However, the code does not check the value returned by pthread_mutex_lock() for errors. [REF-6] Katrina Tsipenyuk, Brian Chess So mark them as Not an issue and move on. When to use LinkedList over ArrayList in Java? This website uses cookies to analyze our traffic and only share that information with our analytics partners. POSIX (POS), SEI CERT Perl Coding Standard - Guidelines 03. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? How do I efficiently iterate over each entry in a Java Map? This is not a perfect solution, since 100% accuracy and coverage are not feasible. In order to avoid data races, correctly written programs must check the result of thread synchronization functions and appropriately handle all errors, either by attempting to recover from them or reporting them to higher levels. I believe this particular behavior is a gap in the Fortify analyzer implementation, as all other static analysis tools seem to understand the code flow and will not complain about potential null references in this case. How do I align things in the following tabular environment? null dereference-after-store . An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. Apple. Dereferencing follows the memory address stored in a reference, to the place in memory where the actual object resides. More specific than a Pillar Weakness, but more general than a Base Weakness. Use of the Common Weakness Enumeration (CWE) and the associated references from this website are subject to the Terms of Use. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? 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? environment so that cmd is not defined, the program throws a null CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. issues result in general software reliability problems, but if an Expressions (EXP), SEI CERT C Coding Standard - Guidelines 12. For example, if a program fails to call chdir() after calling chroot(), it violates the contract that specifies how to change the active root directory in a secure fashion. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. 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. [REF-62] Mark Dowd, John McDonald The program can potentially dereference a null-pointer, thereby raising a NullException. 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. If an attacker provides an address that appears to be well-formed, but the address does not resolve to a hostname, then the call to gethostbyaddr() will return NULL. What is the point of Thrower's Bandolier? McGraw-Hill. Or was it caused by a memory leak that has built up over time? All rights reserved. Check the documentation for the Connection object of the type returned by the getConnection() factory method, and see if the methods rollback() and close() Null Dereference. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. -Wnull-dereference. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. 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. 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. C#/VB.NET/ASP.NET. [A-Z a-z 0-9]*$")){ throw new IllegalArgumentException(); } message.setSubject(subject) This still gets flagged by Fortify. For Benchmark, we've seen it report it both ways. Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. <, [REF-18] Secure Software, Inc.. "The CLASP Application Security Process". As of September 1, 2017, the Material is now offered by Micro Focus, a separately owned and operated company. Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. Note that this code is also vulnerable to a buffer overflow (CWE-119). 2005. Since the code does not check the return value from gethostbyaddr (CWE-252), a NULL pointer dereference (CWE-476) would then occur in the call to strcpy(). An API is a contract between a caller and a callee. <. SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. Null-pointer dereferences, while common, can generally be found and Fixed by #302 Contributor cmheazel on Jan 7, 2018 cmheazel added the Status:Pull-Request-Issued label on Jan 9, 2018 cmheazel mentioned this issue on Feb 22, 2018 Fortify-Issue-300 Null Dereference issues #302 Merged The following code shows a system property that is set to null and later dereferenced by a programmer who mistakenly assumes it will always be defined. a property named cmd defined. 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. The platform is listed along with how frequently the given weakness appears for that instance. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. 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). Fortify keeps track of the parts that came from the original input. They are not necessary and expose risk according to the Fortify scan. Does a summoned creature play immediately after being summoned by a ready action? CWE-476: NULL Pointer Dereference: 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. Returns the thread that currently owns the write lock, or null if not owned. OWASP does not endorse or recommend commercial products or services, allowing our community to remain vendor neutral with the collective wisdom of the best minds in software security worldwide. 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. This information is often useful in understanding where a weakness fits within the context of external information sources. This behavior makes it important for programmers to examine the return value from read() and other IO methods to ensure that they receive the amount of data they expect. American Bandstand Frani Giordano, Could someone advise here? Can archive.org's Wayback Machine ignore some query terms? Alternate Terms Relationships 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. When to use LinkedList over ArrayList in Java? Synopsys-sigcoverity-common-api A challenge mostly of GitHub. In the following code, the programmer assumes that the system always has ASCRM-CWE-252-data. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method.