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. I thinkFortify should be handling this correctly, and we have not found an option that fixes this. Do new devs get fired if they can't solve a certain bug? It could be either removed or replaced. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-after-store. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. @MitchWheat Sure - but if fortify behaves like other analyzers, there may be a null check above this code which doesn't skip this code path if ddl is null. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL), if (conection.State != ConnectionState.Closed) { conection.Close(); }, This Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. \Projects\UnreleasedStream> java HttpURLConnectionReader http != null inputStream != null Exception: java.io.IOExpection: stream is closed http != null inputStream != null . One of the common issues reported by Fortify is the Path Manipulation issue. Since it's not pointing to anything (because that's what null means), that's an error. The root cause of each defect is clearly explained, making it easy to fix bugs Integrated with However, one article [1] claims that the cost of a one year license is based on the number of lines of code, regardless of the number of users. Take the following code: Integer num; num = new Integer(10); Closed; relates to. Software Security | Null Dereference Kingdom: Code Quality Poor code quality leads to unpredictable behavior. Pseudo-Random Number Generators (PRNGs) approximate randomness algorithmically, starting with a seed from . Let us do talk about that in detail. The content must be between 30 and 50000 characters. The bad news is that they do what you tell them to do." 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 Follow Follows a very simple code sample that should reproduce the issue: public override bool Equals (object obj) { var typedObj = obj as SomeCustomClass; if (typedObj == null) return false; return this.Name == typedObj.Name; } In this simple excerpt Fortify complains that "typedObj" can be null in the return statement. "Security problems caused by dereferencing null . Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? String fileString = new String(byteArr); String fileSHA256Hex = DigestUtils.sha256Hex(fileString); // use fileSHA256Hex to validate file. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. But we have observed in practice that not every potential null dereference is a bug that developers want to fix. Here is a POC The Optional class contains methods that can be used to make programs shorter and more intuitive [].. C#/VB.NET/ASP.NET. But it seems that fortify is not considering these checks as a valid null check. The most common quality bug identified was the null pointer dereference, which can cause programmes to crash, or worse, lead to data Null pointer in C. NULL pointer in C, An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant. application of binomial distribution in civil engineering eames replica lounge chair review eames replica lounge chair review You also had the guts to say "never check for null" (if null is invalid).Placing an assert() in every member function that dereferences a pointer is a compromise that will likely placate a lot of people, but even that feels like 'speculative paranoia' to me. In this example, the variable x is an int and Java will initialize it to 0 for you. Null Dereference C/C++ C#/VB.NET/ASP.NET Java/JSP Abstract clones. But, when you try to declare a reference type, something different happens. For example: org.apache.commons.lang3.StringUtils.defaultIfEmpty() The method ThroughDate intentionally uses the C# 6.0 null-conditional operator to guard against null values, and is designed to safely return null if any of the values it processes happen to be null. Learn more about Stack Overflow the company, and our products. dstenger closed this as completed in #302 on Feb 22, 2018. dstenger added this to the 5.2 milestone on Feb 22, 2018. 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. I don't see a problem in line 5. For an attacker it provides an opportunity to stress the system in unexpected ways. Copyright 2023 Open Text Corporation. 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. Successfully merging a pull request may close this issue. relevant defects identified by Prevent were related to potential null dereference. Closed. 0f66c64 (0.15.0) add scripts to check git repo sha lanxia [#6506] 4a7a6b2 (v0.15.0) Fix out-of-bounds write in String.getBytes Benjamin Thomas (Aviansie Ben) [#6502] d58e0f7 (0.15.0) Invoke DomainCombiner.combine() for embedded AccessControlContext Peter Shipton [#6493] 18e7a3c (v0.15.0) Remove extra rpaths in AIX shared libs mikezhang [#6494 . (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) Exceptions. Example 10. An API is a contract between a caller and a callee. A fully runnable web app written in Java, it supports analysis by Static (SAST), Dynamic (DAST), and Runtime (IAST) tools that support Java. However, Fortify is throwing me this warning in the report: The method initForm() in SingleReplacementController.java can crash the program by dereferencing a null-pointer on line 110. It is equivalent to the following code: result = s Is Nothing OrElse s = String.Empty. Check the documentation for the Connection object of the type returned by the getConnection() factory method, and see if the methods rollback() and close() will even throw an exception. It is important to remember here to return the literal and not the char being checked. Symantec security products include an extensive database of attack signatures. Redundant Check For Null Check the JavaDoc for the method Performs a lookup operation on a Raster. 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. If maybeNull is null, the conditional will resolve to false, and will not enter the block where maybeNull.OtherMember is accessed. what if the input has some unicode non-English characters? share. We recently migrated our community to a new web platform and regretably the content for this page needed to be programmatically ported from its previous wiki page. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. This release, developed in Java technology, contains ESM Phase 3 development and upgrade efforts. at com.fortify.sca.Main$Sourceanalyzer.run(Main.java:527) [fortify-sca-18.20.1071.jar:? Null pointers null dereference null dereference - best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. So, in the end, you'll likely set the issue's analysis to Not an issue and just stop worrying about it. In C++, pointers are not guaranteed to be either NULL of have a valid value. Null Dereference (Code Quality, Control Flow): The method ThroughDate() in Program.cs can dereference a null pointer, thereby raising a NullException. Note that on Red Hat Enterprise Linux 6 it is not possible to exploit CVE-2010-2948 to run arbitrary code as the overflow is blocked by FORTIFY_SOURCE. The project is a simple C# console application, with no reference whatsoever to ASP.NET libraries. It's simply a check to make sure the variable is not null. if (foo == null) { foo.setBar (val); . } 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. 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. . You signed in with another tab or window. Is a PhD visitor considered as a visiting scholar? Because your release of resources is conditional on the state of a boolean variable and encased in another try block, the static analyzer must be deciding that rollback() and close() are not guaranteed to execute.. . Try this: Copy Code if (connection != null && conection.State != ConnectionState.Closed) { conection.Close (); } But better, use a using block around your connection creation so it is automatically closed and disposed when it goes out of scope. Thus, enabling the attacker do delete files or otherwise compromise your system. at com.fortify.sca.frontend.FrontEndSession.runSingleFrontEnd(FrontEndSession.java:231) [fortify-sca-18.20.1071.jar:?] 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. Sign in Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. Dereference before null check (REVERSE_INULL) There may be a null pointer exception, or else the . 1. Styling contours by colour and by line thickness in QGIS. Then by the end of this article, you will get complete knowledge about the error and able to solve your issue, lets start with an example. CVE-2006-4447. For instance, what's wrong with this code? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. EXP01-J-EX0: A method may dereference an object-typed parameter without guarantee that it is a valid object reference provided that the method documents that it (potentially) throws a NullPointerException, either via the throws clause of the method or in the method comments. How can i resolve this issue? Using the Tika library FilenameUtils.normalize solves the fortify issue. "The good news about computers is that they do what you tell them to do. 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. Chain: Use of an unimplemented network socket operation pointing to an uninitialized handler function ( CWE-456) causes a crash because of a null pointer dereference ( CWE-476 ). How do I align things in the following tabular environment? The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; . So mark them as Not an issue and move on. Initializes a new instance of the NullReferenceException class, setting the Message property of the new instance to a system-supplied message that describes the error, such as "The value 'null' was found where an instance of an object was required." If the destination Raster is null, a new Raster will be created. If You Got this error while youre compiling your code? Thanks to both of you; that's much clearer now. Already on GitHub? I do not know why and how the Data Flow syntax differs from the Control Flow one. Does it just mean failing to correctly check if a value is null? Linux reduced time to fix new defects, found by Coverity Scan, from 120 days to 5 days. 2Null Dereference 2.1 null null dereference-after-store . Most appsec missions are graded on fixing app vulns, not finding them. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. Does it just mean failing to correctly check if a value is null? If you have a method that should sometimes not return a value, you could return an empty Collection, or an Optional, which is new in Java 8. It would probably help prioritizing a fix if you could attach your repro code. Find and fix defects in your Java, C/C++, C#, JavaScript, Ruby, or Python open source project for free. 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. Thus, enabling the attacker do delete files or otherwise compromise your system. Coppin State University Honors Program, i know which session objects are NULL when the page loads and so i am checking it that if its null . Understand that English isn't everyone's first language so be lenient of bad Thanks for contributing an answer to Stack Overflow! The value is then dereferenced without a null check in ClientAuthenticationCodec.encodeRequest call: Because your release of resources is conditional on the state of a boolean variable and encased in another try block, the static analyzer must be deciding that rollback() and close() are not guaranteed to execute.. 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. Our current plan is to remain open for https://t.co/IwbQgYoZUk, Nov 01, We love seeing this enthusiasm for structural pasteurization from realtors https://t.co/ihCVF4uUk3 https://t.co/3uMUV1VabD, Jul 28. Closed; is cloned by. Believe me, using "dereference" to mean "set to null" is a misconception. As of September 1, 2017, the Material is now offered by Micro Focus, a separately owned and operated company. But, when you try to declare a reference type, something different happens. Searching it online showed only a match in a SonarQube plugin that may be reusing the GUID by mistake. CWE is a community-developed list of software and hardware weakness types. I need to read the properties file kept in user home folder. Fix Suggenstion (issue 208) . Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. An API is a contract between a caller and a callee. Accessing or modifying a null objects field. Team Collaboration and Endpoint Management, We are a .Net shop that recently re-started using Fortify Static Code Analyzer (have version 17.10.0156.). #icon8226{font-size:;background:;padding:;border-radius:;color:;} If you use any of the original input, you may still get the error. (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. Fix Suggenstion null null Null 12NULL_RETURNS. Palash Sachan 8-Feb-17 13:41pm. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you try to access any member variables or methods with that variable, you are trying to dereference it. 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. This solution is not always viable in a production environment. 1 solution Solution 1 Nothing. 101 if (os.equalsIgnoreCase("Windows 95")) { 102 log("OS " os " is not supported"); 103 } else { 104 log("OS " os " is supported"); 105 } 106 107 // Fortify fails to catch a possible NPE as it loses track of the null 108 // resource after passing it to another method.