"Null Dereferencing" false positive when using the "return early One of the common issues reported by Fortify is the Path Manipulation issue. Fortify keeps track of the parts that came from the original input. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. This could allow the server to make the client crash due to the NULL pointer dereference Separate licenses are available for C/C++ analysis and Java analysis. (Java) and to compare it with existing bug reports on the tool to test its efficacy. Is DPAPI still valid option to protect eg. a NULL pointer dereference would then occur in the call to strcpy(). How can I check before my flight that the cloud separation requirements in VFR flight rules are met? How do I align things in the following tabular environment? "Rules for Null Dereference and Redundant Null Check have been reworked to enable reduction of false positive rates. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? This would produce the expected null dereference findings, which could be further tuned to take the null-sanitizing methods into account. at com.fortify.sca.Main$Sourceanalyzer.run(Main.java:527) [fortify-sca-18.20.1071.jar:? 2Null Dereference 2.1 null null dereference-after-store . We have, however, opened a support case with the following repro: Scanning this code with Visual Studio 2015 update 3 and HP Fortify plugin 17.10, two issues are found, both invalid: ASP.NET Bad Practices: Leftover Debug Code (Encapsulation, Structural): The class Program contains debug code, which can create unintended entry points in a deployed web application. share. 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. All rights reserved. : Fortify: On line 768 of HistoryDAOImpl.java, execute() uses hibernate to execute a dynamic SQL statement built with input coming from an untrusted source Fix : Analysis found that this finding is a false positive; no code changes are required. But you must first determine if this is a real security concern or a false positive. How to Fix int cannot be dereferenced Error in Java? If a question is poorly phrased then either ask for clarification, ignore it, or. The issue is that if you take data from an external source, then an attacker can use that source to manipulate your path. OpenFromXML.java, line 545 (Password Management: Empty Password) . Pointer is a programming language data type that references a location in memory. Finally, how to fix the issue with Example code and output. Software Security | Null Dereference Kingdom: Code Quality Poor code quality leads to unpredictable behavior. In Java there are two different variables are there: Since primitives are not objects so they actually do not have any member variables/ methods. But what exactly does it mean to "dereference a null pointer"? The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. Thanks for contributing an answer to Information Security Stack Exchange! But, when you try to declare a reference type, something different happens. These can be: Invoking a method from a null object. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. 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 Now, let us move to the solution for this error. rev2023.3.3.43278. How to add an element to an Array in Java? Closed; is cloned by. Example. : 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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Already on GitHub? The opinions expressed above are the personal opinions of the authors, not of Micro Focus. The null-guarded behaviour would be non-idiomatic and surprising in C++, and therefore should be considered harmful. Thanks for contributing an answer to Stack Overflow! 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. at com.fortify.sca.frontend.FrontEndSession.runSingleFrontEnd(FrontEndSession.java:231) [fortify-sca-18.20.1071.jar:?] This release, developed in Java technology, contains ESM Phase 3 development and upgrade efforts. In summary, nobody writes C++ code that way, so don't do it! There are too few details in this report for us to be able to work on it. Even if you were to add input filtering, the odds are low that Fortify were to recognize it and stop producing the issue. 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 From a user's perspective that often manifests itself as poor usability. 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. Is it correct to use "the" before "materials used in making buildings are"? 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 Abstract. In this article. #icon876:hover{color:;background:;} info@thermapure.com, Wishing everyone a peaceful and green holiday from here in Ventura! Board while may produce spurious "null dereference" reports. 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. #thanksgiving #travelsafe https://t.co/0ZP6bs2vmf, Nov 22, We hope everyone is staying safe during these Southern California Wildfires. Find and fix defects in your Java, C/C++, C#, JavaScript, Ruby, or Python open source project for free . Is a PhD visitor considered as a visiting scholar? CODETOOLS-7900079 Fortify: Analize and fix "Code Correctness: Regular Expressions Denial of Service" issues. Copyright 2023 Open Text Corporation. Provide an answer or move on to the next question. . And if you remember, in other words if you know that the pointer is NULL, you won't have a need to call fill_foo anyway. Fix Suggenstion (issue 208) . Q&A for work. PS: Yes, Fortify should know that these properties are secure. NULL pointer dereference erros are common in C/C++ languages. how to fix null dereference in java fortify - hired20.com Sign in Dereference before null check. If maybeNull is null, the conditional will resolve to false, and will not enter the block where maybeNull.OtherMember is accessed. how to fix null dereference in java fortify - sercano.com For example, In the ClassWriter class, a call is made to the set method of an Item object. 2 bedroom apartment for rent in surrey central, south carolina voter registration statistics, application of binomial distribution in civil engineering, Taylor Swift's Parents Abandoned Mansion Location, hollywood heights full episodes dailymotion. This failure seems a result of the Control Flow rules 65 // covering only simple patterns within methods: 66 // allocated -> set 67 // allocated -> checked 68 // allocated -> used 69 // as in the sample rule 70 // riches/scan/Scenario Rules/Null Pointer Check/scenarioRules.xml" 71 log("dangerousLength is " dangerousLength(arg)); 72 log("protected length is " defaultIfEmpty(arg, "").length()); 73 log("StringUtils protected length is " StringUtils.defaultIfEmpty(arg, "").length()); 74 75 // Fortify catches a possible NPE in using a formerly assigned null, 76 // showing a Null Dereference finding. 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. to fix over 7500 defects across 250 open source projects and 50 million lines of code. The program can potentially dereference a null-pointer, thereby raising a NullException. The best answers are voted up and rise to the top, Not the answer you're looking for? 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. Closed. Thus, enabling the attacker do delete files or otherwise compromise your system. A null pointer dereference, on the other hand, is a specific type of null dereference that occurs when you try to access an object reference that has a null value in a programming language that uses pointers. Take the following code: Integer num; num = new Integer(10); Closed; relates to. email is in use. "The good news about computers is that they do what you tell them to do. Why is that a problem? Fortify: Access Control Database related issue. Redundant Null Check. As we can see in the example mentioned above is an integer(int), which is a primitive type, and hence it cannot be dereferenced. (partial fix)) 1.0.5 (February 7, 2018) handle source files with any character encoding (issue 267) Scala 2.11.6 and 2.11.7 are now supported (issue 217) Fortify prioritizes and categorizes the findings so that we can address them immediately." #icon8226{font-size:;background:;padding:;border-radius:;color:;} In this example, the variable x is an int and Java will initialize it to 0 for you. Java: Null pointer dereferences: ES 5.12 replaced the landing page that contained the user security and privacy disclaimer with a popup screen containing the disclaimer. References As // such, we are adding this other way to determine if . #icon5632:hover{color:;background:;} 180 Canada Larga Rd. If that variable hasn't had a reference assigned, it's a null reference, which (for internal/historical reasons) is referred to as a null pointer. "Leadership is nature's way of removing morons from the productive flow" - Dogbert Articles by Winston can be found here. 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. In Dungeon World, is the Bard's Arcane Art subject to the same failure outcomes as other spells? Explanation Just about every serious attack on a software system begins with the violation of a programmer's assumptions. Missing Check against Null. Fortify flags this for null dereference. Fortify is giving path manipulation error in this line. 2 Answers Sorted by: 4 Fortify is raising an issue, not an error because you are taken input from the process's environment and then opening a path with it without doing any input filtering. If connection is null, it will still throw an exception. privacy statement. Avoid Check for Null Statement in Java | Baeldung Do new devs get fired if they can't solve a certain bug? Still, the problem is not fixed. So mark them as Not an issue and move on. 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. The following code shows an example of a NULL pointer dereference: That said, code lives in an ecosystem, not a vacuum. 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. 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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. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. I thinkFortify should be handling this correctly, and we have not found an option that fixes this. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. Fix Suggenstion null null Null 12NULL_RETURNS. Description. Coppin State University Honors Program, 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. Travel safe this upcoming week. Request PDF | Tracking Null Checks in Open-Source Java Systems | It is widely acknowledged that null values should be avoided if possible or carefully used when necessary in Java code. 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. about checking values between rows with dynamic table created using java script. if (ptr == null) {ptr->field = val;.} Fortify-Issue-300 Null Dereference issues #302. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Computers are deterministic machines, and as such are unable to produce true randomness. . to fix over 7500 defects across 250 open source projects and 50 million lines of code. Attack Signatures. null dereference fortify fix javameat carving knife blank. Basically, yes. current ranch time (not your local time) is, dynamic table creation problem calling onchange, Need to Hide Table inside div:Code is Working Fine in FireFox but Not in IE..Please Help. They should be investigated and fixed OR suppressed as not a bug. Null Dereference C/C++ C#/VB.NET/ASP.NET Java/JSP Abstract clones. Posted 29-Sep-17 0:30am OriginalGriff Comments The Open Web Application Security Project (OWASP) is a nonprofit foundation that works to improve the security of software. Note that this code is also vulnerable to a buffer overflow . If not is there an option we can set so that it does? We revisit previous work on XYLEM, an interprocedural null dereference analysis for Java, and discuss the challenge of comparing the results of different static analysis tools. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. The repro was confirmed by the support representative and the case forwarded to the engineering team. This option is only active when -fdelete-null-pointer-checks is active, which is enabled by optimizations in most targets. By using this site, you accept the Terms of Use and Rules of Participation. ][C:/DIR/npe][38F1CD7C547F94C73D421BDC0BA6B45B : low : System Information Leak : Internal : dataflow ]NPE.java(43) : ->PrintStream.println(0) NPE.java(102) : ->NPE.log(0) NPE.java(98) : <=> (os) NPE.java(98) : <- System.getProperty(return)[38F1CD7C547F94C73D421BDC0BA6B45C : low : System Information Leak : Internal : dataflow ]NPE.java(43) : ->PrintStream.println(0) NPE.java(111) : ->NPE.log(0) NPE.java(109) : <=> (os2) NPE.java(51) : return (s) NPE.java(109) : <->NPE.defaultIfEmpty(0->return) NPE.java(109) : <- System.getProperty(return)[B679BDBBFADB6AD00720E35440F876F7 : high : Null Dereference : controlflow ] NPE.java(57) : Assigned null : arg NPE.java(58) : Branch not taken: ((args.length) <= 0) NPE.java(77) : Dereferenced : arg[935183D4911A3F55EEA10E64B6BDC2F6 : low : Missing Check against Null : controlflow ] NPE.java(98) : start -> allocated : os = getProperty(?) Could anyone from Fortify confirm or refute the flakiness of the null dereference check? There are some Fortify links at the end of the article for your reference. Closed. How can I reduce false positives and maintain the rule? Description The program can potentially dereference a null pointer, thereby raising a NullPointerException. If you have encountered it a lot, that just means it is a popular misconception . #icon876{font-size:;background:;padding:;border-radius:;color:;} From a user's perspective that often manifests itself as poor usability. Bangkok Bank Branch Code List, Before using a pointer, ensure that it is not equal to NULL: if (pointer1 != NULL) { /* make use of pointer1 */ /* . Free source code and tutorials for Software developers and Architects. Also I failed to reproduce the case. Does it just mean failing to correctly check if a value is null? This solution is not always viable in a production environment. Find and fix defects in your Java, C/C++, C#, JavaScript, Ruby, or Python open source project for free. 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. i know which session objects are NULL when the page loads and so i am checking it that if its null . 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. 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. Fix : Analysis found that this is a false positive result; no code changes are required. Jk Robbins wrote:The FindBugs tool is telling me that line 5 contains a null pointer dereference to the id variable but I don't see the problem. So "dereferencing a null pointer" means trying to do something to the object that it's pointing to. Well occasionally send you account related emails. The purpose of this Release Notes document is to announce the release of the ES 5.14. . When indirection operator (*) is used with the pointer variable, then it is known as dereferencing a pointer. Searching it online showed only a match in a SonarQube plugin that may be reusing the GUID by mistake. The . Issue Links clones CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues Closed relates to CODETOOLS-7900046 Complete Fortify code updates Closed Activity All Comments Work Log History Activity If not, leave it as null. CONNECT Software project. Fix : Analysis found that this is a false positive result; no code changes are required. Agreed!!! In C++, pointers are not guaranteed to be either NULL of have a valid value. #icon5632{font-size:;background:;padding:;border-radius:;color:;} application of binomial distribution in civil engineering eames replica lounge chair review eames replica lounge chair review Available in C# 8.0 and later, the unary postfix ! But avoid . : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. So it seems highly unlikely that the line of code you've posted is the source of the exception. A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. In this paper we discuss some of the challenges of using a null dereference CODETOOLS-7900082 Fortify: Analize and fix "Missing Check against Null" issue CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues CODETOOLS-7900080 Fortify: Analize and fix "Log Forging" issues CODETOOLS-7900079 Fortify: Analize and fix "Code Correctness: Regular Expressions Denial of Service" issues CVE-2010-2949 A NULL pointer dereference flaw was found in the way the Quagga bgpd We would like to show you a description here but the site wont allow us. 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. Merged. Null Dereference Analysis in Practice Nathaniel Ayewah Dept. Learn more about Stack Overflow the company, and our products. I need to read the properties file kept in user home folder. If you get an exception, don't catch it and return null, instead wrap and rethrow the exception. Explanation of Java Dereference and Reference: Dereference actually means we access an object from heap memory using a suitable variable. 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. Asking for help, clarification, or responding to other answers. In the most recent project scanned, only 1 of 24 Null Dereference issues found was legitamite. Should Fortify be handling this correctly by default(and we have something misconfigured)? Don't tell someone to read the manual. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8 Chain: The return value of a function returning a pointer is not checked for success ( CWE-252) resulting in the later use of an uninitialized variable ( CWE-456) and a null pointer dereference ( CWE-476) CVE-2007-3798. \Projects\UnreleasedStream> java HttpURLConnectionReader http != null inputStream != null Exception: java.io.IOExpection: stream is closed http != null inputStream != null . 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 content must be between 30 and 50000 characters. "Security problems caused by dereferencing null . So, I suggest an alternative solution. 2007 JavaOneSM Conference 4 | Session TS-2007 | . "Null Dereferencing" false positive when using the "return early Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. That's why it's perfectly OK to assign null to variables or pass null into a method. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. Take the following code: Integer num; num = new Integer(10); . One may need to close Audit Workbench and reimport the project to see whether the vulnerability goes away from scan report. It only takes a minute to sign up.