null dereference fortify fix java

Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. Java/JSP. 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.. For instance, what's wrong with this code? OpenFromXML.java, line 545 (Password Management: Empty Password) . The program can potentially dereference a null-pointer, thereby causing a segmentation fault. The purpose of this Release Notes document is to announce the release of the ES 5.16. The most common quality bug identified was the null pointer dereference, which can cause . On File delete, using java File delete method what could be the security issue? Buy-solutions-manual Legit, 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. Pointer is a programming language data type that references a location in memory. pass = getPassword (); jadejaan over 5 years ago I am trying to validate SMTP header so that fortify can identified it as a fix. So one cannot do Primitive.something(). Let us do talk about that in detail. Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. Well occasionally send you account related emails. 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. However, its // behavior isn't consistent. rev2023.3.3.43278. We are struggling with a large number of false positives from our scans and hoping for some it is a matter of configuration. Thus, enabling the attacker do delete files or otherwise compromise your system. There are some Fortify links at the end of the article for your reference. at com.fortify.sca.frontend.FrontEndSession.runSingleFrontEnd(FrontEndSession.java:231) [fortify-sca-18.20.1071.jar:?] . One may need to close Audit Workbench and reimport the project to see whether the vulnerability goes away from scan report. 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. 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. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. But what exactly does it mean to "dereference a null pointer"? 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." at com.fortify.sca.frontend.FrontEndSession.runFrontEnd(FrontEndSession.java:193) [fortify-sca-18.20.1071.jar:?] In this noncompliant code example, input_str is copied into dynamically allocated memory referenced by c_str.If malloc() fails, it returns a null pointer that is assigned to c_str.When c_str is dereferenced in memcpy(), the program exhibits undefined behavior.. Additionally, if input_str is a null pointer, the call to strlen() dereferences a null Null Dereference C#, After using Fortify to analyze my code, Fortify show me a vulnerability which is " Null Dereference". As we can see in the example mentioned above is an integer(int), which is a primitive type, and hence it cannot be dereferenced. privacy statement. Scala 2.11.6 or newer. 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. Successfully merging a pull request may close this issue. : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. Attack Signatures. The program can dereference a null-pointer because it does not check the return value of a function that might return null. 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. Trying to understand how to get this basic Fourier Series, How to handle a hobby that makes income in US. Contributor. Exceptions. Network Operations Management (NNM and Network Automation). So, I suggest an alternative solution. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. The bad news is that they do what you tell them to do." This option is only active when -fdelete-null-pointer-checks is active, which is enabled by optimizations in most targets. Insecure randomness errors occur when a function that can produce predictable values is used as a source of randomness in security-sensitive context. 90 int npeV = npe.frugalCopy().getV(); 91 92 log("Called a method of an object returned by a method: " npeV); 93 94 if (npeV == 2) { 95 System.clearProperty("os.name"); 96 } 97 98 String os = System.getProperty("os.name"); 99 // Fortify catches a possible NPE where null signals absence of a 100 // resource, showing a Missing Check against Null finding. But it seems that fortify is not considering these checks as a valid null check. 77 log("(as much dangerous) length is " arg.length()); 78 79 arg = StringUtils.defaultIfEmpty(arg, ""); 80 // Fortify stays properly mum below. Redundant Check For Null Check the JavaDoc for the method Performs a lookup operation on a Raster. This message takes into account the current system culture. I need to read the properties file kept in user home folder. In this article. Is DPAPI still valid option to protect eg. The content must be between 30 and 50000 characters. This release, developed in Java technology, contains ESM Phase 3 development and upgrade efforts. Coppin State University Honors Program, . acknowledge that you have read and understood our, Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Android App Development with Kotlin(Live), Full Stack Development with React & Node JS(Live), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Spring Boot - Start/Stop a Kafka Listener Dynamically, Parse Nested User-Defined Functions using Spring Expression Language (SpEL), Split() String method in Java with examples, Object Oriented Programming (OOPs) Concept in Java. Missing Check against Null. Ventura CA 93001 CVE-2009-3547. Connect and share knowledge within a single location that is structured and easy to search. Connect and share knowledge within a single location that is structured and easy to search. Still, the problem is not fixed. Pseudo-Random Number Generators (PRNGs) approximate randomness algorithmically, starting with a seed from . How do I align things in the following tabular environment? #icon5632{font-size:;background:;padding:;border-radius:;color:;} 1. 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. a NULL pointer dereference would then occur in the call to strcpy(). The text was updated successfully, but these errors were encountered: Code modified to fix all identified instances. Thus enabling the attacker do delete files or otherwise compromise your . Explanation of Java Dereference and Reference: Dereference actually means we access an object from heap memory using a suitable variable. Null Dereference C/C++ C#/VB.NET/ASP.NET Java/JSP Abstract clones. In the most recent project scanned, only 1 of 24 Null Dereference issues found was legitamite. Difference Between FileInputStream and FileReader in Java, Introduction about the error with example. If the destination Raster is null, a new Raster will be created. Does it just mean failing to correctly check if a value is null? 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. CVE-2006-4447. : 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. PS: Yes, Fortify should know that these properties are secure. How to add an element to an Array in Java? Our team struggles with the same thing. As a counter-example, though, note that calling free() or delete on a NULL in C and C++ is guaranteed to be a no-op. The main theme of Dereferencing is placing the memory address into the reference. Asking for help, clarification, or responding to other answers. However, it is unclear if the benefits are universal in nature. If connection is null, it will still throw an exception. Could you share the minimal test case? Fix Suggenstion 11Null Dereference. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. By using this site, you accept the Terms of Use and Rules of Participation. I thinkFortify should be handling this correctly, and we have not found an option that fixes this. Alternate Terms Relationships . 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. Available in C# 8.0 and later, the unary postfix ! Closed. This does pass the Fortify review. If a question is poorly phrased then either ask for clarification, ignore it, or. 2007 JavaOneSM Conference 4 | Session TS-2007 | . Example 10. All rights reserved. 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 maybeNull is null, the conditional will resolve to false, and will not enter the block where maybeNull.OtherMember is accessed. 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. Free source code and tutorials for Software developers and Architects. How can I reduce false positives and maintain the rule? Calling equals() method on the int primitive, we encounter this error usually when we try to use the .equals() method instead of == to check the equality. If you have encountered it a lot, that just means it is a popular misconception . (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. Using Kolmogorov complexity to measure difficulty of problems? #happyholidays2019 #earlyday https://t.co/CIUwaC3QFA, Dec 25, We think #rei has the right idea, and #blackfriday is a great day to #optoutside. In my attempts I see that Fortify may lack knowledge of null-sanitizing methods but any method will quiet down the Null Dereference rule. 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. 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. 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. Sign in 2.1.1Null Dereference. All rights reserved. This agrees with Fortify's 81 // alleged lack of tracking method calls and assignments in its 82 // high-risk Null Dereference rule. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Null pointer dereference (NPD) is a widespread vulnerability that occurs whenever an executing program attempts to dereference a null pointer. Unchecked Return Value Missing Check against Null Thank you for visiting OWASP.org. (and obviously if httpInputStream is different from null, to avoid a possible Null Dereference by invoking the close() method). Once the value of the location is obtained by the pointer, this pointer is considered dereferenced. Share Improve this answer Follow edited Jun 4, 2019 at 17:08 answered Jun 4, 2019 at 17:01 Thierry 5,170 33 39 Fortify-Issue-300 Null Dereference issues #302. vent ever possible null dereference. Thanks to both of you; that's much clearer now. Null dereference is a common type of runtime failure in Java programs, and it is necessary to verify whether a dereference in the program is safe. Sorry I do not know how to make sense of the Rule ID you mentioned. I want to pass an encrypted password to another program to decrypt, Tomcat application arbitrary file read exploitation. +1 (416) 849-8900. Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. For an attacker it provides an opportunity to stress the system in unexpected ways. I have a solution to the Fortify Path Manipulation issues. Team Collaboration and Endpoint Management. Fortify Null Dereference in Java; Chain Validation test; Apigee issue with PUT and POST operation; Query annotation not working with and / or operators; org.springframework.beans.factory.BeanDefinitionStoreException: Failed to process import candidates for configuration class Fortify: Null Dereference and Portability Flaw: Locale Dependent Comparison. Jk Robbins wrote:Thanks, you are correct, I meant line 9 and I see the error now. Should you wish to do so, please emailFortifyTechSupport@hpe.com and reference support case#00278285 opened on Oct 10. 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. 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." to fix over 7500 defects across 250 open source projects and 50 million lines of code. Does it just mean failing to correctly check if a value is null? Redundant Null Check. 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 main theme of Dereferencing is placing the memory address into the reference. If you get an exception, don't catch it and return null, instead wrap and rethrow the exception. spelling and grammar. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Don't tell someone to read the manual. Team Collaboration and Endpoint Management. By using this site, you accept the Terms of Use and Rules of Participation. When you have a variable of non-primitive type, it is a reference to an object. To learn more, see our tips on writing great answers. Home; Uncategorized; null dereference fortify fix java; null dereference fortify fix java In Java, a special null value can be assigned to an object reference. Also I failed to reproduce the case. By using this site, you accept the Terms of Use and Rules of Participation. Software Security | Null Dereference Kingdom: Code Quality Poor code quality leads to unpredictable behavior. Assuming the size of the file is less than BUFSIZE, this works fine as long as the information in myFile is encoded the same as the default character set, however if it's using a different encoding, or is a binary file, it . application of binomial distribution in civil engineering Description The program can potentially dereference a null pointer, thereby raising a NullPointerException. Do you need your, CodeProject, 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.. . Already on GitHub? Searching it online showed only a match in a SonarQube plugin that may be reusing the GUID by mistake. Board while may produce spurious "null dereference" reports. This release, developed in Java technology, contains ESM Phase 3 development and upgrade efforts. The repro was confirmed by the support representative and the case forwarded to the engineering team. 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. The SAST tool used was Fortify SCA, . . When indirection operator (*) is used with the pointer variable, then it is known as dereferencing a pointer. Thanks for contributing an answer to Information Security Stack Exchange! Posted 29-Sep-17 0:30am OriginalGriff Comments Null dereference is a commonly occurring defect in Java programs, and many static-analysis tools identify such defects. (Java) and to compare it with existing bug reports on the tool to test its efficacy. The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. Is it plausible for constructed languages to be used to affect thought and control or mold people towards desired outcomes? It essentially means that the object's reference variable is not pointing anywhere and refers to nothing or 'null'. Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? It's simply a check to make sure the variable is not null. share. How to use Slater Type Orbitals as a basis functions in matrix method correctly? In Java there are two different variables are there: Since primitives are not objects so they actually do not have any member variables/ methods. -- Ted Nelson. I did not try that. The suggested remedy to this problem is to use a whitelist of trusted directories as valid inputs; and, reject everything else. 2.1. 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. Generally, null variables, references and collections are tricky to handle in Java code. Description. Null Dereference C/C++ C#/VB.NET/ASP.NET Java/JSP Abstract The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Dim str As String = Nothing If String.IsNullOrEmpty (str) Then MsgBox ("String is null") End If. 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. 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. 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. Before using a pointer, ensure that it is not equal to NULL: if (pointer1 != NULL) { /* make use of pointer1 */ /* . "Rules for Null Dereference and Redundant Null Check have been reworked to enable reduction of false positive rates. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. Copyright 2023 Open Text Corporation. Even if you were to add input filtering, the odds are low that Fortify were to recognize it and stop producing the issue. As of September 1, 2017, the Material is now offered by Micro Focus, a separately owned and operated company. The following code shows an example of a NULL pointer dereference: That said, code lives in an ecosystem, not a vacuum. But, when you try to declare a reference type, something different happens. But it seems that fortify is not considering these checks as a valid null check. The project is a simple C# console application, with no reference whatsoever to ASP.NET libraries. 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. Liberalism Used In A Sentence, 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. 84 log("StringUtils protected (no thanks to Fortify tracking) length is " arg.length()); 85 86 NPE npe = new NPE(1); 87 88 // Fortify fails to catch a possible NPE when the null may come from a 89 // custom method such as frugalCopy(). Dereferencing a null pointer An impossible checked cast . 109 String os2 = defaultIfEmpty(System.getProperty("os.name"), null); 110 if (os2.equalsIgnoreCase("Windows 95")) { 111 log("OS " os2 " is not supported"); 112 } else { 113 log("OS " os2 " is supported"); 114 } 115 } 116 }. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. Why not use a Regular Expression? So it seems highly unlikely that the line of code you've posted is the source of the exception. This release includes enhancements and defect fixes to support ESCC and ES Sustainment. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Palash Sachan 8-Feb-17 13:41pm. a NULL pointer dereference would then occur in the call to strcpy(). It is equivalent to the following code: result = s Is Nothing OrElse s = String.Empty. What it is complaining about is that if you take data from an external source, then an attacker can use that source to manipulate your path. Closed. 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. I don't see a problem in line 5. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. If you use any of the original input, you may still get the error. But avoid . ][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(?)