how to fix null dereference in java fortifyhow to fix null dereference in java fortify

SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. This information is often useful in understanding where a weakness fits within the context of external information sources. How do I connect these two faces together? 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. ImmuniWeb. 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. Browse other questions tagged java fortify or ask your own question. 2. Redundant Null Check. (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. 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. [REF-44] Michael Howard, David LeBlanc The The play-webgoat repository contains an example web app that uses the Play framework. Copyright 2023, OWASP Foundation, Inc. instructions how to enable JavaScript in your web browser. An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. <, [REF-1033] "NULL Pointer Dereference [CWE-476]". In the following code, the programmer assumes that the system always has a property named "cmd" defined. Two common programmer assumptions are "this function call can never fail" and "it doesn't matter if this function call fails". Copyright 2023 Open Text Corporation. 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. Most null pointer This table specifies different individual consequences associated with the weakness. In this case, the caller abuses the callee API by making certain assumptions about its behavior (that the return value can be used for authentication purposes). steps will go a long way to ensure that null-pointer dereferences do not The program can dereference a null-pointer because it does not check the return value of a function that might return null. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. 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. 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. (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) Exceptions. NIST Workshop on Software Security Assurance Tools Techniques and Metrics. Is there a single-word adjective for "having exceptionally strong moral principles"? Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. Ignoring a method's return value can cause the program to overlook unexpected states and conditions. <. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. 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." . Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The best way to fix this is not returning, @MarkRotteveel those are from different classes, is there a way to return an empty list that will not cause null dereference? For an attacker it provides an opportunity to stress the system in unexpected ways. Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. cmd=cmd.trim(); Null-pointer dereference issues can occur through a number of flaws, (where the weakness exists independent of other weaknesses), [REF-6] Katrina Tsipenyuk, Brian Chess Redundant Null Check. environment so that cmd is not defined, the program throws a null Not the answer you're looking for? 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. [1] Standards Mapping - Common Weakness Enumeration, [2] Standards Mapping - Common Weakness Enumeration Top 25 2019, [3] Standards Mapping - Common Weakness Enumeration Top 25 2020, [4] Standards Mapping - Common Weakness Enumeration Top 25 2021, [5] Standards Mapping - Common Weakness Enumeration Top 25 2022, [6] Standards Mapping - DISA Control Correlation Identifier Version 2, [7] Standards Mapping - General Data Protection Regulation (GDPR), [8] Standards Mapping - NIST Special Publication 800-53 Revision 4, [9] Standards Mapping - NIST Special Publication 800-53 Revision 5, [10] Standards Mapping - OWASP Top 10 2004, [11] Standards Mapping - OWASP Application Security Verification Standard 4.0, [12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [13] Standards Mapping - Security Technical Implementation Guide Version 3.1, [14] Standards Mapping - Security Technical Implementation Guide Version 3.4, [15] Standards Mapping - Security Technical Implementation Guide Version 3.5, [16] Standards Mapping - Security Technical Implementation Guide Version 3.6, [17] Standards Mapping - Security Technical Implementation Guide Version 3.7, [18] Standards Mapping - Security Technical Implementation Guide Version 3.9, [19] Standards Mapping - Security Technical Implementation Guide Version 3.10, [20] Standards Mapping - Security Technical Implementation Guide Version 4.1, [21] Standards Mapping - Security Technical Implementation Guide Version 4.2, [22] Standards Mapping - Security Technical Implementation Guide Version 4.3, [23] Standards Mapping - Security Technical Implementation Guide Version 4.4, [24] Standards Mapping - Security Technical Implementation Guide Version 4.5, [25] Standards Mapping - Security Technical Implementation Guide Version 4.6, [26] Standards Mapping - Security Technical Implementation Guide Version 4.7, [27] Standards Mapping - Security Technical Implementation Guide Version 4.8, [28] Standards Mapping - Security Technical Implementation Guide Version 4.9, [29] Standards Mapping - Security Technical Implementation Guide Version 4.10, [30] Standards Mapping - Security Technical Implementation Guide Version 4.11, [31] Standards Mapping - Security Technical Implementation Guide Version 5.1, [32] Standards Mapping - Web Application Security Consortium 24 + 2, [33] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.dotnet.missing_check_against_null, desc.controlflow.java.missing_check_against_null, (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. 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. 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. 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 . one or more programmer assumptions being violated. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. So mark them as Not an issue and move on. How do I align things in the following tabular environment? The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. More information is available Please select a different filter. 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. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. Unchecked return value leads to resultant integer overflow and code execution. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. 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. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. () . By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If an attacker can control the programs and Gary McGraw. Fortify is complaining about a Null Dereference when I set a field to null: But that seems really silly. Removed issues. 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. can be prevented. Abstract. failure of the process. <. attacker might be able to use the resulting exception to bypass security Disclaimer: we hebben een nultolerantiebeleid tegen illegale pornografie. It is important to remember here to return the literal and not the char being checked. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, what happens if, just for testing, you do. 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. if statement; and unlock when it has finished. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-a 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 The program can potentially dereference a null-pointer, thereby causing a segmentation fault. 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. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation. CODETOOLS-7900080 Fortify: Analize and fix 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. even then, little can be done to salvage the process. 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. 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: Team Collaboration and Endpoint Management. 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. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. Implementation: Proper sanity checks at implementation time can 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. Note that this code is also vulnerable to a buffer overflow . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. sanity-checked previous to use, nearly all null-pointer dereferences Because memcpy() assumes that the value is unsigned, it will be interpreted as MAXINT-1 (CWE-195), and therefore will copy far more memory than is likely available to the destination buffer (CWE-787, CWE-788). 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. java"HP Fortify v3.50""Null Dereference"Fortifynull. The TOP 25 Errors List will be updated regularly and will be posted at both the SANS and MITRE sites. While there are no complete fixes aside from conscientious programming, the following steps will go a long way to ensure that NULL pointer dereferences do not occur. Generally, null variables, references and collections are tricky to handle in Java code.They are not only hard to identify but also complex to deal with. Category:Vulnerability. (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). The program can potentially dereference a null-pointer, thereby raising a NullPointerException. It is the same class, @SnakeDoc I'm guessing the OP messed up their. Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. It is impossible for the program to perform a graceful exit if required. Use of the Common Weakness Enumeration (CWE) and the associated references from this website are subject to the Terms of Use. 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. are no complete fixes aside from contentious programming, the following The method Equals() in MxRecord.cs can dereference a null pointer in c# how can we dereference pointer in javascript How Can I clones. Chains can involve more than two weaknesses, and in some cases, they might have a tree-like structure. 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. In this paper we discuss some of the challenges of using a null dereference analysis in . String itemName = request.getParameter(ITEM_NAME); String itemName = request.Item(ITEM_NAME); Dim MyFile As New FileStream("myfile.txt", FileMode.Open, FileAccess.Read, FileShare.Read), void host_lookup(char *user_supplied_addr){, Chain: The return value of a function returning a pointer is not checked for success (, Chain: sscanf() call is used to check if a username and group exists, but the return value of sscanf() call is not checked (. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. How do I generate random integers within a specific range in Java? Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. A Pillar is different from a Category as a Pillar is still technically a type of weakness that describes a mistake, while a Category represents a common characteristic used to group related things. All rights reserved. We set fields to "null" in many places in our code and Fortify is good with that. 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. I'd prefer to get rid of the finding vs. just write it off. High severity (3.7) NULL Pointer Dereference in java-1.8.-openjdk-accessibility | CVE-2019-2962 CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. Null-pointer errors are usually the result of one or more programmer assumptions being violated. <. Page 183. Alternate Terms Relationships [REF-62] Mark Dowd, John McDonald junio 12, 2022. abc news anchors female philadelphia . Connection String Parameter Pollution. Dynamic analysis is a great way to uncover error-handling flaws. The Java VM sets them so, as long as Java isn't corrupted, you're safe. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. null dereference fortify fix java Follow us. ASCRM-CWE-252-resource. Concatenating a string with null is safe. ASCSM-CWE-252-resource. How can we prove that the supernatural or paranormal doesn't exist? This can cause DoDangerousOperation() to operate on an unexpected value. (Or use the ternary operator if you prefer). <, [REF-1031] "Null pointer / Null dereferencing". ASCRM-CWE-252-data. How do I efficiently iterate over each entry in a Java Map? [REF-961] Object Management Group (OMG). But, when you try to declare a reference type, something different happens. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Connect and share knowledge within a single location that is structured and easy to search.

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