Could someone advise here? Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. Basically, yes. The precision of the warnings depends on the optimization options used. if (foo == null) { foo.setBar (val); . } The Java VM sets them so, as long as Java isn't corrupted, you're safe. relevant defects identified by Prevent were related to potential null dereference. It essentially means that the object's reference variable is not pointing anywhere and refers to nothing or 'null'. Java/JSP. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. privacy statement. 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. Thus enabling the attacker do delete files or otherwise compromise your . However, since ES inherits the system use notification/warning banner from the VA Enterprise Identity and Access Management (IAM) Single Sign-On Internal (SSOi) infrastructure when a user initially establishes a session, ES 5.13 is updated to no longer . Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. Well occasionally send you account related emails. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. 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. 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. Board while may produce spurious "null dereference" reports. 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. The unary prefix ! 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. 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 do not know why and how the Data Flow syntax differs from the Control Flow one. 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 ). #icon8226:hover{color:;background:;} 800-366-2022 Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. On File delete, using java File delete method what could be the security issue? #icon876:hover{color:;background:;} [email protected], Wishing everyone a peaceful and green holiday from here in Ventura! Copyright 2023 Open Text Corporation. Fix: Updated code so that ES no longer sends back to VistA the "Delete" signal for the "Unemployable" field. Merged. 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. Connect and share knowledge within a single location that is structured and easy to search. Closed; is cloned by. Primitive [byte, char, short, int, long, float, double, boolean]. 2.1. Software Security | Null Dereference Kingdom: Code Quality Poor code quality leads to unpredictable behavior. To learn more, see our tips on writing great answers. 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. Symantec security products include an extensive database of attack signatures. It could be either removed or replaced. How to Check if Application is Installed in Your Android Phone and Open the App? Alternate Terms Relationships . email is in use. Null pointers null dereference null dereference - best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. 77 log("(as much dangerous) length is " arg.length()); 78 79 arg = StringUtils.defaultIfEmpty(arg, ""); 80 // Fortify stays properly mum below. fill_foo checks if the pointer has a value, not if the pointer has a valid value. When you have a variable of non-primitive type, it is a reference to an object. encryption key? Does it just mean failing to correctly check if a value is null? Fix Suggenstion 11Null Dereference. Agreed!!! How can I ensure that fortify consider these calls as valid null checks? But, when you try to declare a reference type, something different happens. There are too few details in this report for us to be able to work on it. The bad news is that they do what you tell them to do." 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. The main theme of Dereferencing is placing the memory address into the reference. Take the following code: Integer num; num = new Integer(10); Closed; relates to. (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. If maybeNull is null, the conditional will resolve to false, and will not enter the block where maybeNull.OtherMember is accessed. vent ever possible null dereference. of Computer Science University of Maryland College Park, MD [email protected] William Pugh Dept. \Projects\UnreleasedStream> java HttpURLConnectionReader http != null inputStream != null Exception: java.io.IOExpection: stream is closed http != null inputStream != null . The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. Fortify source code analyzer is giving lot's of "Null Dereference" issues becausewe have used Apache Utils to ensure null check. 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. 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. at com.fortify.sca.frontend.Python3FrontEnd.runTranslator(Python3FrontEnd.java:158) [fortify-sca-18.20.1071.jar:?] However, its // behavior isn't consistent. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. Note that you can copy references without accessing the object it references. @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. Noncompliant Code Example. 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. When we dereference a pointer, then the value of the . This is it, how to fix the int cannot be dereferenced error in Java. CONNECT Software project. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Exceptions. Copyright 2023 Open Text Corporation. Dim str As String = Nothing If String.IsNullOrEmpty (str) Then MsgBox ("String is null") End If. The most common forms of API abuse are caused by the caller failing to honor its end of this contract. 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). Should you wish to do so, please [email protected] and reference support case#00278285 opened on Oct 10. By using this site, you accept the Terms of Use and Rules of Participation. -- Ted Nelson. How to add an element to an Array in Java? Travel safe this upcoming week. If you try to access any member variables or methods with that variable, you are trying to dereference it. Computers are deterministic machines, and as such are unable to produce true randomness. 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. But you must first determine if this is a real security concern or a false positive. Free source code and tutorials for Software developers and Architects. But we have observed in practice that not every potential null dereference is a "bug" that developers want to fix. a NULL pointer dereference would then occur in the call to strcpy(). "The good news about computers is that they do what you tell them to do. The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; . 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. What I mean is, you must remember to set the pointer to NULL or it won't work. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. CODETOOLS-7900080 Fortify: Analize and fix "Log Forging" issues. How Intuit democratizes AI development across teams through reusability. I need to read the properties file kept in user home folder. Please be sure to answer the question.Provide details and share your research! Demos (FindBugs, Fortify SCA) Integrating static analysis Wrap up. Example 10. Issue Links. ][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(?) : 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. Dereference before null check. Explanation. Investigate instances where Fortify has identified a null pointer as a potential security flaw. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. Poor code quality leads to unpredictable behavior. I have problem to understand how is that solving original issue - path in configuration file How to resolve Path Manipulation error given by fortify? One of the more common false positives is is a Null Dereference when the access is guarded by the null-conditional operator introduced with C# 6.0. in the above example, the if clause is essentially equivalent to: If maybeNull is null, the conditional will resolve to false, and will not enter the block where maybeNull.OtherMember is accessed. Pointers are variables that store the memory address of an object, and a null pointer dereference occurs when you try to access an object . 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 }. Fix : Analysis found that this is a false positive result; no code changes are required. Q&A for work. 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. . a NULL pointer dereference would then occur in the call to strcpy(). 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. Why not use a Regular Expression? 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. Null dereference is a commonly occurring defect in Java programs, and many static-analysis tools identify such defects. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. Now, let us move to the solution for this error. String fileString = new String(byteArr); String fileSHA256Hex = DigestUtils.sha256Hex(fileString); // use fileSHA256Hex to validate file. 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. 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. OpenFromXML.java, line 545 (Password Management: Empty Password) . 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. But we have observed in practice that not every potential null dereference is a bug that developers want to fix. We are struggling with a large number of false positives from our scans and hoping for some it is a matter of configuration. 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(). to fix over 7500 defects across 250 open source projects and 50 million lines of code. This code will definitely crash due to a null pointer dereference in certain cases.. View Defect : wazuh/ossec-wazuh: USE_AFTER_FREE: C/C++: . Why are Suriname, Belize, and Guinea-Bissau classified as "Small Island Developing States"? int count = fis.read(byteArr);. Coverity does not list their price publicly. As of September 1, 2017, the Material is now offered by Micro Focus, a separately owned and operated company. . Thanks to both of you; that's much clearer now. Security problems result from trusting input. Try this: 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. The purpose of this Release Notes document is to announce the release of the ES 5.14. . to fix over 7500 defects across 250 open source projects and 50 million lines of code. One may need to close Audit Workbench and reimport the project to see whether the vulnerability goes away from scan report. But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. In the most recent project scanned, only 1 of 24 Null Dereference issues found was legitamite. Explanation Just about every serious attack on a software system begins with the violation of a programmer's assumptions. 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. One of the common issues reported by Fortify is the Path Manipulation issue. . Our team struggles with the same thing. Information Security Stack Exchange is a question and answer site for information security professionals. Most null pointer issues result in general software reliability problems, but if attackers can intentionally trigger a null pointer dereference, they can use the resulting exception to bypass security logic or to cause the application to reveal debugging information that will be valuable in planning subsequent attacks. Find and fix defects in your Java, C/C++, C#, JavaScript, Ruby, or Python open source project for free . Teams. Fix Suggenstion (issue 208) . Dereferencing a null pointer An impossible checked cast . Contributor. 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. Main.java, lines 120-137: Description: SQL injection vulnerabilities occur when data enters an application from an untrusted source and is used to dynamically construct a SQL query. 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. Pull request submitted. Most appsec missions are graded on fixing app vulns, not finding them. Copyright 2023 Open Text Corporation. 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. Learn more . at com.fortify.sca.frontend.FrontEndSession.runSingleFrontEnd(FrontEndSession.java:231) [fortify-sca-18.20.1071.jar:?] 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. 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 . Fortify source code analyzer is giving lot's of "Null Dereference" issues because we have used Apache Utils to ensure null check. 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. Pseudo-Random Number Generators (PRNGs) approximate randomness algorithmically, starting with a seed from . #icon876{font-size:;background:;padding:;border-radius:;color:;} JavaDereference before null check . +1 (416) 849-8900. 20 Bay Street, 11th Floor Toronto, Ontario, Canada M5J 2N8
The program can potentially dereference a null-pointer, thereby raising a NullException. Asking for help, clarification, or responding to other answers. Null-pointer errors are usually the result of one or more programmer assumptions being violated. In the most recent project scanned, only 1 of 24 Null Dereference issues found was legitamite. This message takes into account the current system culture. Team Collaboration and Endpoint Management. 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
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