how to fix null dereference in java fortify

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. operator is the logical negation operator. Team Collaboration and Endpoint Management. I know we could change the code to remove it, but that would be changing the structure of our code because of a problem in the tool. I'll update as soon as I have more information thx Thierry. 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. operator is the null-forgiving, or null-suppression, operator. Disadvantages Of Group Learning, Why is this sentence from The Great Gatsby grammatical? which best describes the pillbugs organ of respiration; jesse pearson obituary; ion select placeholder color; best fishing spots in dupage county Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. 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. java - How to resolve Path Manipulation error given by fortify Agissons ici, pour que a change l-bas ! Compliance Failure. [REF-961] Object Management Group (OMG). NULL Pointer Dereference in java-1.8.0-openjdk-accessibility | CVE-2019 This listing shows possible areas for which the given weakness could appear. "Null Dereferencing" false positive when using the - Micro Focus Copyright 20062023, The MITRE Corporation. If you preorder a special airline meal (e.g. citrus county livestock regulations; how many points did klay thompson score last night. The program can potentially dereference a null-pointer, thereby causing a segmentation fault. Why are trials on "Law & Order" in the New York Supreme Court? Vulnerability Summary for the Week of April 29, 2013 | CISA Identify error conditions that are not likely to occur during normal usage and trigger them. Use automated static analysis tools that target this type of weakness. 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(). corrected in a simple way. 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. 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. 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. This website uses cookies to analyze our traffic and only share that information with our analytics partners. Chat client allows remote attackers to cause a denial of service (crash) via a passive DCC request with an invalid ID number, which causes a null dereference. Pillar - a weakness that is the most abstract type of weakness and represents a theme for all class/base/variant weaknesses related to it. More information is available Please select a different filter. The platform is listed along with how frequently the given weakness appears for that instance. Alternate Terms Relationships How can we prove that the supernatural or paranormal doesn't exist? How do I read / convert an InputStream into a String in Java? I'd prefer to get rid of the finding vs. just write it off. Disclaimer: we hebben een nultolerantiebeleid tegen illegale pornografie. 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. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. ; Fix #308: Status color of tests in left frame; Fix #284: Enhance TEAM Engine to evaluate if core conformance classes are configured Copy link. 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 More specific than a Pillar Weakness, but more general than a Base Weakness. The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. occur. 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. attacker can intentionally trigger a null pointer dereference, the System.clearProperty ("os.name"); . 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. High severity (3.7) NULL Pointer Dereference in java-1.8.-openjdk-accessibility | CVE-2019-2962 Pour adhrer l'association, rien de plus simple : une cotisation minimale de 1,50 est demande. NULL pointer dereferences are frequently resultant from rarely encountered error conditions, since these are most likely to escape detection during the testing phases. 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. NULL Pointer Dereference in java-1.8.0-openjdk-accessibility | CVE-2021 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). Page 183. Addison Wesley. These classes simply add the small amount of data to the return buffer, and set the return value to the number of bytes or characters read. Object obj = new Object (); String text = obj.toString (); // 'obj' is dereferenced. 2006. Here is a code snippet: getAuth() should not return null. View - a subset of CWE entries that provides a way of examining CWE content. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. The program might dereference a null-pointer because it does not check the return value of a function that might return null. The ftrace implementation in the Linux kernel before 3.8.8 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging the CAP_SYS_ADMIN capability for write access to the (1) set_ftrace_pid or (2) set_graph_function file, and then making an lseek system call. 1st Edition. A null-pointer dereference takes place when a pointer with a value of The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. Chapter 20, "Checking Returns" Page 624. 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. Explicitly initialize all your variables and other data stores, either during declaration or just before the first usage. 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. java.util.Collections.emptyList() should only be used, if you are sure that every caller of the method does not change the list (does not try to add any items), as this would fail on this unmodifiable List. 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. CWE - CWE-476: NULL Pointer Dereference (4.10) - Mitre Corporation An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. But if an I/O error occurs, fgets() will not null-terminate buf. 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). "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". The issue is that if you take data from an external source, then an attacker can use that source to manipulate your path. 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. Fix: Commented out the debug lines to the logger. This type of 'return early' pattern is very common with validation as it avoids nested scopes thus making the code easier to read in general. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. steps will go a long way to ensure that null-pointer dereferences do not Is Java "pass-by-reference" or "pass-by-value"? 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. int *ptr; int *ptr; After the declaration of an integer pointer variable, we store the address of 'x' variable to the pointer variable 'ptr'. Browse other questions tagged java fortify or ask your own question. Connect and share knowledge within a single location that is structured and easy to search. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. 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)? Is a PhD visitor considered as a visiting scholar? (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. Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers), Minimising the environmental effects of my dyson brain. a property named cmd defined. 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? For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . Wikipedia. Unchecked return value leads to resultant integer overflow and code execution. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. Category - a CWE entry that contains a set of other entries that share a common characteristic. how to fix null dereference in java fortify The different Modes of Introduction provide information about how and when this weakness may be introduced. does pass the Fortify review. This user is already logged in to another session. Harvest Property Management Lodi, Ca, Another good example of library abuse is expecting the callee to return trustworthy DNS information to the caller. We set fields to "null" in many places in our code and Fortify is good with that. Variant level weaknesses typically describe issues in terms of 3 to 5 of the following dimensions: behavior, property, technology, language, and resource. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Only iterating over the list would be fine. Is this from a fortify web scan, or from a static code analysis? Note that this code is also vulnerable to a buffer overflow . The method isXML () in jquery-1.4.4.js can dereference a null pointer on line 4283, thereby raising a NullExcpetion. Implementation: Proper sanity checks at implementation time can I think I know why I'm getting it , just wanted to know what would be the best way to fix the issue. report. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-a 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. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). The Phase identifies a point in the life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase. public class MyClass {. So mark them as Not an issue and move on. PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. When an object has been found, the requested method is called ( toString in this case). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. This information is often useful in understanding where a weakness fits within the context of external information sources. String os = System.getProperty ("os.name"); if (os.equalsIgnoreCase ("Windows 95") ) System.out.println ("Not supported"); Best Practice for Suppressing Fortify SCA Findings logic or to cause the application to reveal debugging information that Asking for help, clarification, or responding to other answers. attacker might be able to use the resulting exception to bypass security JavaDereference before null check <. These classes simply add the small amount of data to the return buffer, and set the return value to the number of bytes or characters read. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? 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(). What is the point of Thrower's Bandolier? Microsoft Press. The programmer expects that when fgets() returns, buf will contain a null-terminated string of length 9 or less. ( A girl said this after she killed a demon and saved MC). What video game is Charlie playing in Poker Face S01E07? 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. A force de persvrance et de courage, la petite fourmi finit par arriver au sommet de la montagne. Check the results of all functions that return a value and verify that the value is expected. Software Security | Missing Check against Null - Micro Focus Any reference to the HP and Hewlett Packard Enterprise/HPE marks is historical in nature, and the HP and Hewlett Packard Enterprise/HPE marks are the property of their respective owners. So mark them as Not an issue and move on. Address the Null Dereference issues identified by the Fortify scan. JS Strong proficiency with Rest API design implementation experience. Category:Code Quality Il suffit de nous contacter ! 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. One weakness, X, can directly create the conditions that are necessary to cause another weakness, Y, to enter a vulnerable condition. It's simply a check to make sure the variable is not null. In .NET, it is not uncommon for programmers to misunderstand Read() and related methods that are part of many System.IO classes. Avoid Check for Null Statement in Java | Baeldung Reply Cancel Cancel; Top Take the following code: Integer num; num = new Integer(10); Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') Fix : Analysis found that this is a false positive result; no code changes are required. Thanks for the input! "Security problems caused by dereferencing null . CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. LKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH] dm: fix dax_dev NULL dereference @ 2019-07-30 11:37 Pankaj Gupta 2019-07-30 11:38 ` Pankaj Gupta 0 siblings, 1 reply; 7+ messages in thread From: Pankaj Gupta @ 2019-07-30 11:37 UTC (permalink / raw) To: snitzer, dan.j.williams Cc: dm-devel, linux-nvdimm, linux-fsdevel, linux-kernel, agk, pagupta 'Murphy Zhou' reports . Palash Sachan 8-Feb-17 13:41pm. Follow Up: struct sockaddr storage initialization by network format-string. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. To learn more, see our tips on writing great answers. large number of packets leads to NULL dereference, packet with invalid error status value triggers NULL dereference, Chain: race condition for an argument value, possibly resulting in NULL dereference. David LeBlanc. An API is a contract between a caller and a callee. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. Expressions (EXP), SEI CERT C Coding Standard - Guidelines 03. PS: Yes, Fortify should know that these properties are secure. Fix : Analysis found that this is a false positive result; no code changes are required. Does a summoned creature play immediately after being summoned by a ready action? Java (Undetermined Prevalence) C# (Undetermined Prevalence) Common Consequences. The different Modes of Introduction provide information about how and when this weakness may be introduced. Making statements based on opinion; back them up with references or personal experience. How to tell Jackson to ignore a field during serialization if its value is null? What is a NullPointerException, and how do I fix it? This table specifies different individual consequences associated with the weakness. 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." 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." getAuth() should not return null.A method returning a List should per convention never return null but an empty List as default "empty" value.. private List getAuth(){ return new ArrayList<>(); } java.util.Collections.emptyList() should only be used, if you are sure that every caller of the method does not change the list (does not try to add any items), as this case " Null Dereference ": return 476; // Fortify reports weak randomness issues under Obsolete by ESAPI, rather than in // the Insecure Randomness category if it thinks you are using ESAPI. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. When this happens, CWE refers to X as "primary" to Y, and Y is "resultant" from X. 2nd Edition. High severity (5.3) NULL Pointer Dereference in java-1.8.-openjdk-accessibility | CVE-2021-35578 Clark Atlanta University Music Department, Why are non-Western countries siding with China in the UN? Server allows remote attackers to cause a denial of service (crash) via malformed requests that trigger a null dereference. For Benchmark, we've seen it report it both ways. 2016-01. ImmuniWeb. Unchecked Return Value Missing Check against Null - OWASP null dereference fortify fix java Follow us. Network Operations Management (NNM and Network Automation). Take the following code: Integer num; num = new Integer(10); So you have a couple of choices: Ignore the warning. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? Without handling the error, there is no way to know. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. How to will fortify scan in eclipse Ace Madden. It is impossible for the program to perform a graceful exit if required. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). 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. If an attacker can control the programs Chain - a Compound Element that is a sequence of two or more separate weaknesses that can be closely linked together within software. "The Art of Software Security Assessment". set them to NULL once they are freed: If you are working with a multi-threaded or otherwise asynchronous void host_lookup(char *user_supplied_addr){, if("com.example.URLHandler.openURL".equals(intent.getAction())) {. CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues. The program can dereference a null-pointer because it does not check the return value of a function that might return null. How can I find out which sectors are used by files on NTFS? Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. Penticton Regional Hospital Diagnostic Imaging, 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. Thierry's answer works great. Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. This is not a perfect solution, since 100% accuracy and coverage are not feasible. Software Security | Null Dereference - Micro Focus how to fix null dereference in java fortify. For example, In the ClassWriter class, a call is made to the set method of an Item object. What does this means in this context? Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. Many modern techniques use data flow analysis to minimize the number of false positives.