However, its // behavior isn't consistent. Real Estate Software Dubai > blog > how to fix null dereference in java fortify Jun 12, 2022 beauty appeal in advertising It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. The main theme of Dereferencing is placing the memory address into the reference. The program can dereference a null-pointer because it does not check the return value of a function that might return null. In my attempts I see that Fortify may lack knowledge of null-sanitizing methods but any method will quiet down the Null Dereference rule. Exceptions. 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. . . Even if you were to add input filtering, the odds are low that Fortify were to recognize it and stop producing the issue. Closed. We can fix this issue just by replacing the .equals() method with== so lets implement == symbol and try to compile our code. An attack signature is a unique arrangement of information that can be used to identify an attacker's attempt to exploit a known operating system or application vulnerability. Example 1: In the following code, the programmer confirms that the variable foo is null and subsequently dereferences it erroneously. Custom Component : Missing Update Model Phase? But we have observed in practice that not every potential null dereference is a "bug" that developers want to fix. I know we could change the code to remove it, but that would be changing the structure of our code because of a problem in the tool. So, I suggest an alternative solution. Should Fortify be handling this correctly by default(and we have something misconfigured)? But, when you try to declare a reference type, something different happens. Pointer is a programming language data type that references a location in memory. The latest patch releases are recommended (2.13.5, 2.12.13, and 2.11.12 as of February 2021). So "dereferencing a null pointer" means trying to do something to the object that it's pointing to. I did not try that. 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. Copyright 2023 Open Text Corporation. Our team struggles with the same thing. Free source code and tutorials for Software developers and Architects. By using this site, you accept the Terms of Use and Rules of Participation. Connect and share knowledge within a single location that is structured and easy to search. One of the more common false positives is is a Null Dereference when the access is guarded by the, Name: Fortify Secure Coding Rules, Core, .NET, Network Operations Management (NNM and Network Automation). So one cannot do Primitive.something(). Dereference before null check (REVERSE_INULL) There may be a null pointer exception, or else the . I need to read the properties file kept in user home folder. of Computer Science University of Maryland College Park, MD ayewah@cs.umd.edu William Pugh Dept. CVE-2009-3620. Is it correct to use "the" before "materials used in making buildings are"? By using this site, you accept the Terms of Use and Rules of Participation. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. Here, we will follow the below-mentioned points to understand and eradicate the error alongside checking the outputs with minor tweaks in our sample code. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Many analysis techniques have been proposed to determine when a potentially null value may be dereferenced. 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. we have been using fortify tool in our code to check for security vulnerabilities. This release, developed in Java technology, contains ESM Phase 3 development and upgrade efforts. We are struggling with a large number of false positives from our scans and hoping for some it is a matter of configuration. operator is the logical negation operator. Once the value of the location is obtained by the pointer, this pointer is considered dereferenced. The . All rights reserved. 77 log("(as much dangerous) length is " arg.length()); 78 79 arg = StringUtils.defaultIfEmpty(arg, ""); 80 // Fortify stays properly mum below. Styling contours by colour and by line thickness in QGIS. But you must first determine if this is a real security concern or a false positive. Team Collaboration and Endpoint Management. 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. It's simply a check to make sure the variable is not null. Java/JSP Abstract The program can dereference a null-pointer because it does not check the return value of a function that might return null. If the destination Raster is null, a new Raster will be created. Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. Fortify is giving path manipulation error in this line. Let us do talk about that in detail. But I do see a problem in line 9: Thanks, you are correct, I meant line 9 and I see the error now. Example 10. : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. However, it is unclear if the benefits are universal in nature. Take the following code: Integer num; num = new Integer(10); Closed; relates to. In this paper we discuss some of the challenges of using a null dereference analysis in practice, and reasons why developers may not feel it necessary to change code to prevent ever possible null dereference. Does it just mean failing to correctly check if a value is null? Agreed!!! When it comes to these specific properties, you're safe. Thanks for contributing an answer to Information Security Stack Exchange! #channelislandsharbor #oxnard @ C https://t.co/ns1WvY7xHh, Nov 29, Happy Thanksgiving from all of us at ThermaPure! FindBugs is sponsored by Fortify Software FindBugs is a popular analysis tool . Fix: Updated code so that ES no longer sends back to VistA the "Delete" signal for the "Unemployable" field. PS: Yes, Fortify should know that these properties are secure. Coverity's suggestion to fix this bug is to use a delete[] deallocator, but the concerned file is in C so that won't work. Fix Suggenstion 11Null Dereference. Fix : Analysis found that this is a false positive result; no code changes are required. 31 in Google's Java code Embrace and fix your dumb mistakes. How can I ensure that fortify consider these calls as valid null checks? CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Many analysis techniques have been proposed to determine when a potentially null value may be dereferenced. : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. In this example, the variable x is an int and Java will initialize it to 0 for you. For example, In the ClassWriter class, a call is made to the set method of an Item object. I've been searching for an explanation of this message and can't find anything that clearly explains it. Computers are deterministic machines, and as such are unable to produce true randomness. fill_foo checks if the pointer has a value, not if the pointer has a valid value. It essentially means that the object's reference variable is not pointing anywhere and refers to nothing or 'null'. i know which session objects are NULL when the page loads and so i am checking it that if its null . The Java VM sets them so, as long as Java isn't corrupted, you're safe. If you get an exception, don't catch it and return null, instead wrap and rethrow the exception. How can we prove that the supernatural or paranormal doesn't exist? But avoid . email is in use. Redundant Check For Null Check the JavaDoc for the method Performs a lookup operation on a Raster. Most null-pointer issues result in general software reliability problems, but if an attacker can intentionally trigger a null-pointer dereference, the attacker may be able to use the resulting exception to bypass security logic or to cause the application to reveal debugging information Also, the term 'pointer' is bad (but maybe it comes from the FindBugs tool): Java doesn't have pointers, it has references. The unary prefix ! 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. To actually scan translated code for vulnerabilities, you must either: be a licensed Fortify SCA user. 1 solution Solution 1 Nothing. Parse the input for a whitelist of acceptable characters. CVE-2006-4447. As we can see in the example mentioned above is an integer(int), which is a primitive type, and hence it cannot be dereferenced. There are too few details in this report for us to be able to work on it. This solution is not always viable in a production environment. int count = fis.read(byteArr);. 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. Does it just mean failing to correctly check if a value is null? . Now, let us move to the solution for this error. You signed in with another tab or window. 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 ). If not is there an option we can set so that it does? (Java) and to compare it with existing bug reports on the tool to test its efficacy. 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. 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." : System.getProperty may return NULL NPE.java(98) : allocated -> allocated : os may be null NPE.java(101) : allocated -> used : os.equalsIgnoreCase() : os used without null check[A423998C51F661CE8B2EB269BB0AF58D : low : Poor Logging Practice : Use of a System Output Stream : structural ] NPE.java(43)[5494E2A573D3F6F3F5F24DE49D893068 : low : J2EE Bad Practices : Leftover Debug Code : structural ] NPE.java(56)$ cat -n NPE.java 1 package npe; 2 3 import org.apache.commons.lang3.StringUtils; 4 5 public class NPE { 6 int v; 7 8 9 public NPE(int v) { 10 this.v = v; 11 } 12 13 14 public static int dangerousLength(String s) { 15 return s.length(); 16 } 17 18 19 public String stringify() { 20 if (v != 0) { 21 return "non-0"; 22 } else { 23 return null; 24 } 25 } 26 27 28 public NPE frugalCopy() { 29 if (v != 0) { 30 return new NPE(v); 31 } else { 32 return null; 33 } 34 } 35 36 37 public int getV() { 38 return v; 39 } 40 41 42 public static void log(String s) { 43 System.out.println(s); 44 } 45 46 47 public static String defaultIfEmpty(String s, String v) { 48 if (s == null || s.length() == 0) { 49 return v; 50 } else { 51 return s; 52 } 53 } 54 55 56 public static void main(String[] args) { 57 String arg = null; 58 if (args.length > 0) { 59 arg = args[0]; 60 } 61 log("arg is " arg); 62 63 // Fortify fails to catch a possible NPE when the null is passed as an 64 // argument.
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