logic or to cause the application to reveal debugging information that NULL pointer dereferences are frequently resultant from rarely encountered error conditions, since these are most likely to escape detection during the testing phases. Base - a weakness What video game is Charlie playing in Poker Face S01E07? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, what happens if, just for testing, you do. Fortify found 2 "Null Dereference" issues. One can also violate the caller-callee contract from the other side. "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". What is the point of Thrower's Bandolier? More specific than a Pillar Weakness, but more general than a Base Weakness. how to fix null dereference in java fortify. For example, if a coder subclasses SecureRandom and returns a non-random value, the contract is violated. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called. 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. Depending upon the type and size of the application, it may be possible to free memory that is being used elsewhere so that execution can continue. even then, little can be done to salvage the process. Il suffit de nous contacter ! The Optional class contains methods that can be used to make programs shorter and more intuitive [].. For Benchmark, we've seen it report it both ways. Making statements based on opinion; back them up with references or personal experience. Connection String Parameter Pollution. 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. Address the Null Dereference issues identified by the Fortify scan. When designing a function, make sure you return a value or throw an exception in case of an error. 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. NIST. Browse other questions tagged java fortify or ask your own question. An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Category:Code Quality Why is this sentence from The Great Gatsby grammatical? The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). While there Connect and share knowledge within a single location that is structured and easy to search. If an attacker can create a smaller file, the program will recycle the remainder of the data from the previous user and treat it as though it belongs to the attacker. I have a solution to the Fortify Path Manipulation issues. Does a summoned creature play immediately after being summoned by a ready action? Requirements specification: The choice could be made to use a failure of the process. serve to prevent null-pointer dereferences. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. Addison Wesley. The Java VM sets them so, as long as Java isn't corrupted, you're safe. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. Cross-Session Contamination. The program can dereference a null-pointer because it does not check the return value of a function that might return null. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. Chains can involve more than two weaknesses, and in some cases, they might have a tree-like structure. The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. can be prevented. There are some Fortify links at the end of the article for your reference. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. When a reference has the value null, dereferencing . McGraw-Hill. More information is available Please select a different filter. The TOP 25 Errors List will be updated regularly and will be posted at both the SANS and MITRE sites. 2005. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This website uses cookies to analyze our traffic and only share that information with our analytics partners. Team Collaboration and Endpoint Management. "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. The issue is that if you take data from an external source, then an attacker can use that source to manipulate your path. Note that this code is also vulnerable to a buffer overflow (CWE-119). This solution passes the Fortify scan. ( A girl said this after she killed a demon and saved MC). CODETOOLS-7900082 Fortify: Analize and fix "Missing Check against Null" issue. Asking for help, clarification, or responding to other answers. If the program is performing an atomic operation, it can leave the system in an inconsistent state. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. How to will fortify scan in eclipse Ace Madden. 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. 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. 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. Null Dereference Analysis in Practice Nathaniel Ayewah Dept. 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. cmd=cmd.trim(); Null-pointer dereference issues can occur through a number of flaws, 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. This table specifies different individual consequences associated with the weakness. It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. To learn more, see our tips on writing great answers. [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. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. Not the answer you're looking for? Suppress the warning (if Fortify allows that). 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. PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. This table shows the weaknesses and high level categories that are related to this weakness. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. [REF-6] Katrina Tsipenyuk, Brian Chess 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. NIST Workshop on Software Security Assurance Tools Techniques and Metrics. and Gary McGraw. 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 lack of a null terminator in buf can result in a buffer overflow in the subsequent call to strcpy(). Null-pointer dereferences, while common, can generally be found and Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. A check-after-dereference error occurs when a program dereferences a pointer that can be, [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 - Motor Industry Software Reliability Association (MISRA) C Guidelines 2012, [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 - Payment Card Industry Data Security Standard Version 3.0, [15] Standards Mapping - Payment Card Industry Data Security Standard Version 3.1, [16] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2, [17] Standards Mapping - Payment Card Industry Data Security Standard Version 3.2.1, [18] Standards Mapping - Payment Card Industry Software Security Framework 1.0, [19] Standards Mapping - Payment Card Industry Software Security Framework 1.1, [20] Standards Mapping - Security Technical Implementation Guide Version 3.1, [21] Standards Mapping - Security Technical Implementation Guide Version 3.4, [22] Standards Mapping - Security Technical Implementation Guide Version 3.5, [23] Standards Mapping - Security Technical Implementation Guide Version 3.6, [24] Standards Mapping - Security Technical Implementation Guide Version 3.7, [25] Standards Mapping - Security Technical Implementation Guide Version 3.9, [26] Standards Mapping - Security Technical Implementation Guide Version 3.10, [27] Standards Mapping - Security Technical Implementation Guide Version 4.1, [28] Standards Mapping - Security Technical Implementation Guide Version 4.2, [29] Standards Mapping - Security Technical Implementation Guide Version 4.3, [30] Standards Mapping - Security Technical Implementation Guide Version 4.4, [31] Standards Mapping - Security Technical Implementation Guide Version 4.5, [32] Standards Mapping - Security Technical Implementation Guide Version 4.6, [33] Standards Mapping - Security Technical Implementation Guide Version 4.7, [34] Standards Mapping - Security Technical Implementation Guide Version 4.8, [35] Standards Mapping - Security Technical Implementation Guide Version 4.9, [36] Standards Mapping - Security Technical Implementation Guide Version 4.10, [37] Standards Mapping - Security Technical Implementation Guide Version 4.11, [38] Standards Mapping - Security Technical Implementation Guide Version 5.1, [39] Standards Mapping - Web Application Security Consortium 24 + 2, [40] Standards Mapping - Web Application Security Consortium Version 2.00. Content Provider URI Injection. Expressions (EXP), SEI CERT C Coding Standard - Guidelines 12. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. 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). Here is a code snippet: public class Example { private Collection<Auth> Authorities; public Example (SomeUser user) { for (String role: user.getAuth ()) { //This is where Fortify gives me a null dereference Authorities.add (new Auth (role)); } } private List<String> getAuth () { return null; } } java fortify Share Improve this question American Bandstand Frani Giordano, Java/JSP. Copyright 2023 Open Text Corporation. The programmer expects that when fgets() returns, buf will contain a null-terminated string of length 9 or less. 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. <, [REF-1031] "Null pointer / Null dereferencing". In this paper we discuss some of the challenges of using a null dereference analysis in . 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. Microsoft Press. 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. What's the difference between a power rail and a signal line? [A-Z a-z 0-9]*$")){ throw new IllegalArgumentException(); } message.setSubject(subject) This still gets flagged by Fortify. 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. chain: unchecked return value can lead to NULL dereference. Chain: Use of an unimplemented network socket operation pointing to an uninitialized handler function (, Chain: race condition might allow resource to be released before operating on it, leading to NULL dereference, Chain: some unprivileged ioctls do not verify that a structure has been initialized before invocation, leading to NULL dereference, Chain: IP and UDP layers each track the same value with different mechanisms that can get out of sync, possibly resulting in a NULL dereference, Chain: uninitialized function pointers can be dereferenced allowing code execution, Chain: improper initialization of memory can lead to NULL dereference, Chain: game server can access player data structures before initialization has happened leading to NULL dereference, Chain: The return value of a function returning a pointer is not checked for success (, Chain: a message having an unknown message type may cause a reference to uninitialized memory resulting in a null pointer dereference (, Chain: unchecked return value can lead to NULL dereference.