What's the difference between a power rail and a signal line? 2010. 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). <. logic or to cause the application to reveal debugging information that Two common programmer assumptions are "this function call can never fail" and "it doesn't matter if this function call fails". My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? For an attacker it provides an opportunity to stress the system in unexpected ways. Real ghetto African girls smoking with their pussies. Once you are fixing issues automatically (not all issues will be like this, so focus on certain always-true positives with standardized remediation that can be code generated through high-fidelity qualities), then you can turn your attention towards trivial true positives. Why are non-Western countries siding with China in the UN? 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. 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. 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. are no complete fixes aside from contentious programming, the following Fix: Added if block around the close call at line 906 to keep this from being . But if an I/O error occurs, fgets() will not null-terminate buf. 2016-01. An awesome tip to avoid NPE is to return empty When it comes to these specific properties, you're safe. . The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. including race conditions and simple programming omissions. Browse other questions tagged java fortify or ask your own question. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. Is a PhD visitor considered as a visiting scholar? report. attacker might be able to use the resulting exception to bypass security Here is a code snippet: getAuth() should not return null. Dynamic analysis is a great way to uncover error-handling flaws. Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. 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." : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. This argument ignores three important considerations: The following examples read a file into a byte array. Unchecked return value leads to resultant integer overflow and code execution. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Anyone have experience with this one? 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. [REF-44] Michael Howard, David LeBlanc Apple. 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. 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. NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. -Wnull-dereference. <, [REF-1032] "Null Reference Creation and Null Pointer Dereference". Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. How do I generate random integers within a specific range in Java? The method isXML () in jquery-1.4.4.js can dereference a null pointer on line 4283, thereby raising a NullExcpetion. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, what happens if, just for testing, you do. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. Address the Null Dereference issues identified by the Fortify scan. 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. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Category - a CWE entry that contains a set of other entries that share a common characteristic. how many points did klay thompson score last night, keller williams luxury listing presentation, who died in the manchester united plane crash, what does the bible say about feeding birds, Penticton Regional Hospital Diagnostic Imaging, Clark Atlanta University Music Department, is the character amos decker black or white. How to will fortify scan in eclipse Ace Madden. Thank you for visiting OWASP.org. Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. I got Fortify findings back and I'm getting a null dereference. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. language that is not susceptible to these issues. More specific than a Pillar Weakness, but more general than a Base Weakness. Follows a very simple code sample that should reproduce the issue: In this simple excerpt Fortify complains that "typedObj" can be null in the return statement. The TOP 25 Errors List will be updated regularly and will be posted at both the SANS and MITRE sites. Deerlake Middle School Teachers, Not the answer you're looking for? The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. I'll update as soon as I have more information thx Thierry. Share Improve this answer Follow edited Jun 4, 2019 at 17:08 answered Jun 4, 2019 at 17:01 Thierry 5,170 33 39 Wij hebben geen controle over de inhoud van deze sites. I think I know why I'm getting it , just wanted to know what would be the best way to fix the issue. 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. 2016-01. (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) Exceptions. Program does not check return value when invoking functions to drop privileges, which could leave users with higher privileges than expected by forcing those functions to fail. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-a 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. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. Object obj = new Object (); String text = obj.toString (); // 'obj' is dereferenced. 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. Does a barbarian benefit from the fast movement ability while wearing medium armor? The program can potentially dereference a null-pointer, thereby raising a NullPointerException. This table specifies different individual consequences associated with the weakness. Linux-based device mapper encryption program does not check the return value of setuid and setgid allowing attackers to execute code with unintended privileges. Improper Check for Unusual or Exceptional Conditions, Error Conditions, Return Values, Status Codes, OWASP Top Ten 2004 Category A7 - Improper Error Handling, CERT C Secure Coding Standard (2008) Chapter 9 - Memory Management (MEM), The CERT Oracle Secure Coding Standard for Java (2011) Chapter 4 - Expressions (EXP), CERT C++ Secure Coding Section 08 - Memory Management (MEM), SFP Secondary Cluster: Unchecked Status Condition, CISQ Quality Measures (2016) - Reliability, SEI CERT Oracle Secure Coding Standard for Java - Guidelines 02. Is this from a fortify web scan, or from a static code analysis? rev2023.3.3.43278. (Or use the ternary operator if you prefer). 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. Find centralized, trusted content and collaborate around the technologies you use most. When designing a function, make sure you return a value or throw an exception in case of an error. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . 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. Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. NIST. If you can guaranty this, then the empty List is even better, as it does not create a new object all the time. 2005. "Security problems caused by dereferencing null . So mark them as Not an issue and move on. Game allows remote attackers to cause a denial of service (server crash) via a missing argument, which triggers a null pointer dereference. A password reset link will be sent to you by email. Note that this code is also vulnerable to a buffer overflow (CWE-119). 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. 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. It is important to remember here to return the literal and not the char being checked. Cross-Session Contamination. rev2023.3.3.43278. Identify error conditions that are not likely to occur during normal usage and trigger them. PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. ASCRM-CWE-252-data. One can also violate the caller-callee contract from the other side. and Justin Schuh. () . The program can dereference a null-pointer because it does not check the return value of a function that might return null. 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. This listing shows possible areas for which the given weakness could appear. 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. 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. <, [REF-1031] "Null pointer / Null dereferencing". Base level weaknesses typically describe issues in terms of 2 or 3 of the following dimensions: behavior, property, technology, language, and resource. More specific than a Base weakness. 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 For trivial true positives, these are ones that just never need to be fixed. Null Dereference Analysis in Practice Nathaniel Ayewah Dept. This listing shows possible areas for which the given weakness could appear. Unfortunately our Fortify scan takes several hours to run. 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: "Automated Source Code Security Measure (ASCSM)". Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. Returns the thread that currently owns the write lock, or null if not owned. 2.1. String os = System.getProperty ("os.name"); if (os.equalsIgnoreCase ("Windows 95") ) System.out.println ("Not supported"); NIST.