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. int *ptr; int *ptr; After the declaration of an integer pointer variable, we store the address of 'x' variable to the pointer variable 'ptr'. operator is the logical negation operator. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. I got Fortify findings back and I'm getting a null dereference. Java (Undetermined Prevalence) C# (Undetermined Prevalence) Common Consequences. and John Viega. Connection String Parameter Pollution. 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. We set fields to "null" in many places in our code and Fortify is good with that. <, [REF-18] Secure Software, Inc.. "The CLASP Application Security Process". Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. 2nd Edition. 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. Copyright 20062023, The MITRE Corporation. If the program is performing an atomic operation, it can leave the system in an inconsistent state. 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(). How do I generate random integers within a specific range in Java? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. View - a subset of CWE entries that provides a way of examining CWE content. Null pointer errors are usually the result of Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Use automated static analysis tools that target this type of weakness. As it merges scan results, Fortify Static Code Analyzer marks issues that were uncovered in a previous scan, but are no longer evident in the most recent Fortify Static Code Analyzer analysis results as Removed. This table specifies different individual consequences associated with the weakness. 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. 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." What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. ASCRM-CWE-252-resource. JS Strong proficiency with Rest API design implementation experience. 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. The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. Connect and share knowledge within a single location that is structured and easy to search. 2005-11-07. 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? NIST. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. But, when you try to declare a reference type, something different happens. Game allows remote attackers to cause a denial of service (server crash) via a missing argument, which triggers a null pointer dereference. Page 183. For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . Improper Check for Unusual or Exceptional Conditions, Unchecked Return Value to NULL Pointer Dereference, Memory Allocation with Excessive Size Value, Improperly Controlled Sequential Memory Allocation, OWASP Top Ten 2004 Category A9 - Denial of Service, CERT C Secure Coding Standard (2008) Chapter 4 - Expressions (EXP), CERT C Secure Coding Standard (2008) Chapter 9 - Memory Management (MEM), CERT C++ Secure Coding Section 03 - Expressions (EXP), CERT C++ Secure Coding Section 08 - Memory Management (MEM), SFP Secondary Cluster: Faulty Pointer Use, SEI CERT Oracle Secure Coding Standard for Java - Guidelines 02. This is an example of a Project or Chapter Page. 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. 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. Check the results of all functions that return a value and verify that the value is non-null before acting upon it. 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. Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. 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. <. More specific than a Pillar Weakness, but more general than a Base Weakness. Synopsys-sigcoverity-common-api A challenge mostly of GitHub. When this happens, CWE refers to X as "primary" to Y, and Y is "resultant" from X. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. If you trigger an unhandled exception or similar error that was discovered and handled by the application's environment, it may still indicate unexpected conditions that were not handled by the application itself. if statement; and unlock when it has finished. John Aldridge Hillsborough Nc Obituary, Closed; is cloned by. rev2023.3.3.43278. Closed. 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 is used as though it pointed to a valid memory area. When a reference has the value null, dereferencing . In .NET, it is not uncommon for programmers to misunderstand Read() and related methods that are part of many System.IO classes. and Gary McGraw. The Java VM sets them so, as long as Java isn't corrupted, you're safe. 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. occur. and Gary McGraw. What is the correct way to screw wall and ceiling drywalls? 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. (where the weakness exists independent of other weaknesses), [REF-6] Katrina Tsipenyuk, Brian Chess The program might dereference a null-pointer because it does not check the return value of a function that might return null. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Note that this code is also vulnerable to a buffer overflow . Most appsec missions are graded on fixing app vulns, not finding them. [1] J. Viega, G. McGraw Building Secure Software Addison-Wesley, [2] Standards Mapping - Common Weakness Enumeration, [3] Standards Mapping - Common Weakness Enumeration Top 25 2019, [4] Standards Mapping - Common Weakness Enumeration Top 25 2020, [5] Standards Mapping - Common Weakness Enumeration Top 25 2021, [6] Standards Mapping - Common Weakness Enumeration Top 25 2022, [7] Standards Mapping - DISA Control Correlation Identifier Version 2, [8] Standards Mapping - General Data Protection Regulation (GDPR), [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 - Security Technical Implementation Guide Version 3.1, [15] Standards Mapping - Security Technical Implementation Guide Version 3.4, [16] Standards Mapping - Security Technical Implementation Guide Version 3.5, [17] Standards Mapping - Security Technical Implementation Guide Version 3.6, [18] Standards Mapping - Security Technical Implementation Guide Version 3.7, [19] Standards Mapping - Security Technical Implementation Guide Version 3.9, [20] Standards Mapping - Security Technical Implementation Guide Version 3.10, [21] Standards Mapping - Security Technical Implementation Guide Version 4.1, [22] Standards Mapping - Security Technical Implementation Guide Version 4.2, [23] Standards Mapping - Security Technical Implementation Guide Version 4.3, [24] Standards Mapping - Security Technical Implementation Guide Version 4.4, [25] Standards Mapping - Security Technical Implementation Guide Version 4.5, [26] Standards Mapping - Security Technical Implementation Guide Version 4.6, [27] Standards Mapping - Security Technical Implementation Guide Version 4.7, [28] Standards Mapping - Security Technical Implementation Guide Version 4.8, [29] Standards Mapping - Security Technical Implementation Guide Version 4.9, [30] Standards Mapping - Security Technical Implementation Guide Version 4.10, [31] Standards Mapping - Security Technical Implementation Guide Version 4.11, [32] Standards Mapping - Security Technical Implementation Guide Version 5.1, [33] Standards Mapping - Web Application Security Consortium 24 + 2, [34] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.cpp.missing_check_against_null. Error Handling (ERR), SEI CERT C Coding Standard - Guidelines 50. 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. Revolution Radio With Scott Mckay, The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). 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. Concatenating a string with null is safe. Note that this code is also vulnerable to a buffer overflow (CWE-119). serve to prevent null-pointer dereferences. Only iterating over the list would be fine. Team Collaboration and Endpoint Management. Can archive.org's Wayback Machine ignore some query terms? Fix : Analysis found that this is a false positive result; no code changes are required. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. 2005-11-07. does pass the Fortify review. For Benchmark, we've seen it report it both ways. One can also violate the caller-callee contract from the other side. Address the Null Dereference issues identified by the Fortify scan. The programmer expects that when fgets() returns, buf will contain a null-terminated string of length 9 or less. Why are non-Western countries siding with China in the UN? . The The play-webgoat repository contains an example web app that uses the Play framework. pointer exception when it attempts to call the trim() method. Fortify Null Dereference in Java; Chain Validation test; Apigee issue with PUT and POST operation; Query annotation not working with and / or operators; org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. Or was it caused by a memory leak that has built up over time? logic or to cause the application to reveal debugging information that Cross-Session Contamination. Why is this sentence from The Great Gatsby grammatical? one or more programmer assumptions being violated. It's simply a check to make sure the variable is not null. 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. Euler: A baby on his lap, a cat on his back thats how he wrote his immortal works (origin?). Null Dereference Analysis in Practice Nathaniel Ayewah Dept. This argument ignores three important considerations: The following examples read a file into a byte array. More information is available Please select a different filter. () . Many modern techniques use data flow analysis to minimize the number of false positives. 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. 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. 2019-07-15. Apple. To learn more, see our tips on writing great answers. Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. Alternate Terms Relationships Network monitor allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference. 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. Chains can involve more than two weaknesses, and in some cases, they might have a tree-like structure. Ensure that you account for all possible return values from the function. Veracode's dynamic analysis scan automates the process, returning detailed guidance on security flaws to help developers fix them for good. This is not a perfect solution, since 100% accuracy and coverage are not feasible. Avoid Returning null from Methods. Suppress the warning (if Fortify allows that). 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. [REF-62] Mark Dowd, John McDonald These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. 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. So mark them as Not an issue and move on. Expressions (EXP), SEI CERT C Coding Standard - Guidelines 12. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. In this tutorial, we'll take a look at the need to check for null in Java and various alternatives that . Alle links, video's en afbeeldingen zijn afkomstig van derden. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. This solution passes the Fortify scan. process, unless exception handling (on some platforms) is invoked, and Note that this code is also vulnerable to a buffer overflow . Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. <. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. As a matter of fact, any miss in dealing with null cannot be identified at compile time and results in a NullPointerException at runtime.. steps will go a long way to ensure that null-pointer dereferences do not attacker might be able to use the resulting exception to bypass security Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, what happens if, just for testing, you do. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-after-store. 2005. Share Improve this answer Follow edited Jun 4, 2019 at 17:08 answered Jun 4, 2019 at 17:01 Thierry 5,170 33 39 When an object has been found, the requested method is called ( toString in this case). Instead use String.valueOf (object). 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. [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. 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. clones. Dereference before null check. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact. 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. Palash Sachan 8-Feb-17 13:41pm. This listing shows possible areas for which the given weakness could appear. [REF-44] Michael Howard, David LeBlanc About an argument in Famine, Affluence and Morality. McGraw-Hill. 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.