Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. steps will go a long way to ensure that null-pointer dereferences do not 856867 Defect: The method prettyPrintXML1() in IAMWebServiceDelegateImpl.java can crash the program by dereferencing a null pointer on line 906. 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. Asking for help, clarification, or responding to other answers. The program can potentially dereference a null-pointer, thereby raising a NullException. Game allows remote attackers to cause a denial of service (server crash) via a missing argument, which triggers a null pointer dereference. This example takes an IP address from a user, verifies that it is well formed and then looks up the hostname and copies it into a buffer. An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. Unchecked return value leads to resultant integer overflow and code execution. View - a subset of CWE entries that provides a way of examining CWE content. caught at night in PUBLIC POOL!!! What is the purpose of this D-shaped ring at the base of the tongue on my hiking boots? Here is a code snippet: getAuth() should not return null. can be prevented. [REF-6] Katrina Tsipenyuk, Brian Chess Or was it caused by a memory leak that has built up over time? Revolution Radio With Scott Mckay, "Automated Source Code Reliability Measure (ASCRM)". Show activity on this post. [A-Z a-z 0-9]*$")){ throw new IllegalArgumentException(); } message.setSubject(subject) This still gets flagged by Fortify. By using this site, you accept the Terms of Use and Rules of Participation. Description. Null Dereference Analysis in Practice Nathaniel Ayewah Dept. Harvest Property Management Lodi, Ca, 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. Exceptions. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. Fix: Commented out the debug lines to the logger. Cross-Site Flashing. [REF-62] Mark Dowd, John McDonald C#/VB.NET/ASP.NET. Returns the thread that currently owns the write lock, or null if not owned. 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. 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. 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. Closed; is cloned by. How do I generate random integers within a specific range in Java? (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. 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." The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). Cookie Security. Avoid Returning null from Methods. 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 For more information, please refer to our General Disclaimer. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. junio 12, 2022. abc news anchors female philadelphia . This table specifies different individual consequences associated with the weakness. I have a solution to the Fortify Path Manipulation issues. Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. . 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. It is important to remember here to return the literal and not the char being checked. (where the weakness exists independent of other weaknesses), [REF-6] Katrina Tsipenyuk, Brian Chess [REF-7] Michael Howard and Most errors and unusual events in Java result in an exception being thrown. 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. Class - a weakness that is described in a very abstract fashion, typically independent of any specific language or technology. Team Collaboration and Endpoint Management. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. 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. Use automated static analysis tools that target this type of weakness. Null-pointer errors are usually the result of one or more programmer assumptions being violated. Can archive.org's Wayback Machine ignore some query terms? 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 issues result in general software reliability problems, but if an . Does a summoned creature play immediately after being summoned by a ready action? Disadvantages Of Group Learning, that is linked to a certain type of product, typically involving a specific language or technology. Making statements based on opinion; back them up with references or personal experience. Concatenating a string with null is safe. 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(). Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. 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. a NULL pointer dereference would then occur in the call to strcpy(). Synopsys-sigcoverity-common-api A challenge mostly of GitHub. Common Weakness Enumeration. "Sin 11: Failure to Handle Errors Correctly." 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. A Community-Developed List of Software & Hardware Weakness Types, Class: Not Language-Specific (Undetermined Prevalence), Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart. Abstract. 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. ASCRM-CWE-252-data. occur. Thanks for contributing an answer to Stack Overflow! Stringcmd=System.getProperty("cmd"); 2. 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. Deerlake Middle School Teachers, 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. Chapter 20, "Checking Returns" Page 624. Suppress the warning (if Fortify allows that). 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, how to fix null dereference in java fortify 2022, Birthday Wishes For 14 Year Old Son From Mother. 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)? 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. Thanks for the input! Ensure that you account for all possible return values from the function. Dereferencing follows the memory address stored in a reference, to the place in memory where the actual object resides. chain: unchecked return value can lead to NULL dereference. 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. Why are non-Western countries siding with China in the UN? sanity-checked previous to use, nearly all null-pointer dereferences are no complete fixes aside from contentious programming, the following The program might dereference a null-pointer because it does not check the return value of a function that might return null. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? Expressions (EXP), Weaknesses in the 2019 CWE Top 25 Most Dangerous Software Errors, Weaknesses in the 2021 CWE Top 25 Most Dangerous Software Weaknesses, Weaknesses in the 2020 CWE Top 25 Most Dangerous Software Weaknesses, Weaknesses in the 2022 CWE Top 25 Most Dangerous Software Weaknesses, https://samate.nist.gov/SSATTM_Content/papers/Seven%20Pernicious%20Kingdoms%20-%20Taxonomy%20of%20Sw%20Security%20Errors%20-%20Tsipenyuk%20-%20Chess%20-%20McGraw.pdf, https://cwe.mitre.org/documents/sources/TheCLASPApplicationSecurityProcess.pdf, https://en.wikipedia.org/wiki/Null_pointer#Null_dereferencing, https://developer.apple.com/documentation/code_diagnostics/undefined_behavior_sanitizer/null_reference_creation_and_null_pointer_dereference, https://www.immuniweb.com/vulnerability/null-pointer-dereference.html, Cybersecurity and Infrastructure Security Agency, Homeland Security Systems Engineering and Development Institute, Null Dereference (Null Pointer Dereference), updated Applicable_Platforms, Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings, Weakness_Ordinalities, updated Common_Consequences, Demonstrative_Examples, Other_Notes, Potential_Mitigations, Weakness_Ordinalities, updated Potential_Mitigations, Relationships, updated Demonstrative_Examples, Description, Detection_Factors, Potential_Mitigations, updated Demonstrative_Examples, Observed_Examples, Relationships, updated Related_Attack_Patterns, Relationships, updated Observed_Examples, Related_Attack_Patterns, Relationships, updated Relationships, Taxonomy_Mappings, White_Box_Definitions, updated Demonstrative_Examples, Observed_Examples, updated Alternate_Terms, Applicable_Platforms, Observed_Examples. CWE is a community-developed list of software and hardware weakness types. 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). Example . Microsoft Press. 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. operator is the null-forgiving, or null-suppression, operator. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. ImmuniWeb. is incorrect. 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. More information is available Please select a different filter. 2005-11-07. 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. An API is a contract between a caller and a callee. [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. Anyone have experience with this one? JS Strong proficiency with Rest API design implementation experience. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. More specific than a Pillar Weakness, but more general than a Base Weakness. and Justin Schuh. Take the following code: Integer num; num = new Integer(10); Cross-Client Data Access. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. Enter the username or e-mail you used in your profile. ASCRM-CWE-252-resource. ASCSM-CWE-252-resource. matthew le nevez love child facebook; how to ignore a house on fire answer key twitter; who is depicted in this ninth century equestrian portrait instagram; wasilla accident report youtube; newark state of the city 2021 mail 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. Chain - a Compound Element that is a sequence of two or more separate weaknesses that can be closely linked together within software. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. In the following example, it is possible to request that memcpy move a much larger segment of memory than assumed: If returnChunkSize() happens to encounter an error it will return -1. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. 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. The majority of true, relevant defects identified by Prevent were related to potential null dereference. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. <, [REF-1033] "NULL Pointer Dereference [CWE-476]". "24 Deadly Sins of Software Security". Only iterating over the list would be fine. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. void host_lookup(char *user_supplied_addr){, if("com.example.URLHandler.openURL".equals(intent.getAction())) {. An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. Fortify found 2 "Null Dereference" issues. 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. <, [REF-1032] "Null Reference Creation and Null Pointer Dereference". 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. Category - a CWE entry that contains a set of other entries that share a common characteristic. 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. Take the following code: Integer num; num = new Integer(10); of Computer Science University of Maryland College Park, MD ayewah@cs.umd.edu William Pugh Dept. The program can dereference a null-pointer because it does not check the return value of a function that might return null. 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.
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