how to fix null dereference in java fortify

Poor code quality leads to unpredictable behavior. Availability: Null-pointer dereferences invariably result in the The code loops through a set of users, reading a private data file for each user. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. Error Handling (ERR), SEI CERT C Coding Standard - Guidelines 50. What is the correct way to screw wall and ceiling drywalls? NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. How can I find out which sectors are used by files on NTFS? This table specifies different individual consequences associated with the weakness. 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 table shows the weaknesses and high level categories that are related to this weakness. Null pointer errors are usually the result of (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) Exceptions. Vulnerability 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. One can also violate the caller-callee contract from the other side. Note that this code is also vulnerable to a buffer overflow . This argument ignores three important considerations: The following examples read a file into a byte array. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. environment so that cmd is not defined, the program throws a null Browse other questions tagged java fortify or ask your own question. Time arrow with "current position" evolving with overlay number, Doubling the cube, field extensions and minimal polynoms. 2010. Clark Atlanta University Music Department, It's simply a check to make sure the variable is not null. 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. caught at night in PUBLIC POOL!!! Variant - a weakness When this happens, CWE refers to X as "primary" to Y, and Y is "resultant" from X. The platform is listed along with how frequently the given weakness appears for that instance. vegan) just to try it, does this inconvenience the caterers and staff? This table specifies different individual consequences associated with the weakness. How can we prove that the supernatural or paranormal doesn't exist? 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? Check the results of all functions that return a value and verify that the value is expected. Stringcmd=System.getProperty("cmd"); Cross-Session Contamination. CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues. To learn more, see our tips on writing great answers. How to tell Jackson to ignore a field during serialization if its value is null? Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. Cross-Site Flashing. Linux-based device mapper encryption program does not check the return value of setuid and setgid allowing attackers to execute code with unintended privileges. ASCSM-CWE-252-resource. 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. Monitor the software for any unexpected behavior. 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. Revolution Radio With Scott Mckay, The text was updated successfully, but these errors were encountered: cmheazel self-assigned this Jan 8, 2018 The best way to avoid memory leaks in C++ is to have as few new/delete calls at the program level as possible ideally NONE. Ensure that you account for all possible return values from the function. clones. Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. This behavior makes it important for programmers to examine the return value from read() and other IO methods to ensure that they receive the amount of data they expect. 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. In .NET, it is not uncommon for programmers to misunderstand Read() and related methods that are part of many System.IO classes. In the following code, the programmer assumes that the system always has a property named "cmd" defined. 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. serve to prevent null-pointer dereferences. 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. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. are no complete fixes aside from contentious programming, the following The following code does not check to see if memory allocation succeeded before attempting to use the pointer returned by malloc(). If there is a more properplace to file these types of bugs feel free to share and I'll proceed to file the bug there. 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. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. null. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation. <, [REF-962] Object Management Group (OMG). About an argument in Famine, Affluence and Morality. La Segunda Vida De Bree Tanner. If you preorder a special airline meal (e.g. 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. 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. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. <. 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. Theres still some work to be done. 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. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-a <, [REF-18] Secure Software, Inc.. "The CLASP Application Security Process". 2. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. CWE is a community-developed list of software and hardware weakness types. This information is often useful in understanding where a weakness fits within the context of external information sources. Is it suspicious or odd to stand by the gate of a GA airport watching the planes? 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. The following VB.NET code does not check to make sure that it has read 50 bytes from myfile.txt. 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. It is important to remember here to return the literal and not the char being checked. The most common forms of API abuse are caused by the caller failing to honor its end of this contract. 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." When an object has been found, the requested method is called ( toString in this case). The following function attempts to acquire a lock in order to perform operations on a shared resource. "Automated Source Code Reliability Measure (ASCRM)". Common Weakness Enumeration. 856867 Defect: The method prettyPrintXML1() in IAMWebServiceDelegateImpl.java can crash the program by dereferencing a null pointer on line 906. -Wnonnull-compare is included in -Wall. This table specifies different individual consequences associated with the 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. Most null pointer (Java) and to compare it with existing bug reports on the tool to test its efficacy. Fix : Analysis found that this is a false positive result; no code changes are required. "Security problems caused by dereferencing null . [A-Z a-z 0-9]*$")){ throw new IllegalArgumentException(); } message.setSubject(subject) This still gets flagged by Fortify. (where the weakness exists independent of other weaknesses), [REF-6] Katrina Tsipenyuk, Brian Chess Requirements specification: The choice could be made to use a Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. Added Fortify's analysis trace, which is showing that the dereference of sortName is the problem.