The project is a simple C# console application, with no reference whatsoever to ASP.NET libraries. If Fortify SCA can be put into a pipeline, it can also be hooked to fix issues automatically (although care must be taken to avoid situations like the Debian OpenSSL PRNG vulnerability, which was not a vulnerability until a security-focused static code analyzer suggested a fix that ended up being the vulnerability). If there is a more properplace to file these types of bugs feel free to share and I'll proceed to file the bug there. Take the following code: Integer num; num = new Integer(10); Closed; relates to. It's simply a check to make sure the variable is not null. If connection is null, it will still throw an exception. Thus, enabling the attacker do delete files or otherwise compromise your system. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. This agrees with Fortify's 81 // alleged lack of tracking method calls and assignments in its 82 // high-risk Null Dereference rule. 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. How to use Slater Type Orbitals as a basis functions in matrix method correctly? CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. The following code shows an example of a NULL pointer dereference: That said, code lives in an ecosystem, not a vacuum. It is not uncommon for Java programmers to misunderstand read() and related methods that are part of many java.io classes. The Open Web Application Security Project (OWASP) is a nonprofit foundation that works to improve the security of software. a NULL pointer dereference would then occur in the call to strcpy(). how to fix null dereference in java fortify Literal null values are passed as the third and fourth arguments.In the definition of set, It works under 64-bit systems in Windows, Linux and macOS environments, and can analyze source code intended for 32-bit, 64-bit and embedded ARM platforms. Chain: race condition might allow resource to be released before operating on it, leading to NULL dereference. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Closed. 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. 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. Is Made In Chelsea Scripted, When it comes to these specific properties, you're safe. 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. Below is an example. There are too few details in this report for us to be able to work on it. application of binomial distribution in civil engineering 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. The text was updated successfully, but these errors were encountered: Code modified to fix all identified instances. Why is that a problem? Demos (FindBugs, Fortify SCA) Integrating static analysis Wrap up. Note: Before moving to this, to fix the issue in Example 1 we can print, 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. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. 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. 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. Learn more about Stack Overflow the company, and our products. Example 1: In the following code, the programmer confirms that the variable foo is null and subsequently dereferences it erroneously. But, when you try to declare a reference type, something different happens. 77 log("(as much dangerous) length is " arg.length()); 78 79 arg = StringUtils.defaultIfEmpty(arg, ""); 80 // Fortify stays properly mum below. There are at least three flavors of this problem: check-after-dereference, dereference-after-check, and dereference-after-store. Accessing or modifying a null objects field. Does it just mean failing to correctly check if a value is null? 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. 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. Provide an answer or move on to the next question. #icon876:hover{color:;background:;} info@thermapure.com, Wishing everyone a peaceful and green holiday from here in Ventura! 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. 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. But I do see a problem in line 9: Thanks, you are correct, I meant line 9 and I see the error now. CVE-2009-3547. Fix: Updated code so that ES no longer sends back to VistA the "Delete" signal for the "Unemployable" field. This release includes enhancements and defect fixes to support ESCC and ES Sustainment. Sorry I do not know how to make sense of the Rule ID you mentioned. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. 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." Fix Suggenstion 11Null Dereference. Fix Suggenstion null null Null 12NULL_RETURNS. 2007 JavaOneSM Conference 2 | Session TS-2007 | 0 Defect: 5.13.0 Fortify: Log Forging. Fix : Analysis found that this is a false positive result; no code changes are required. Wait hold on what is dereference now?. Null Dereference Object Model Violation: Just one of equals() and hashCode() Defined Dead Code: Unused Field As we already know that "what is a pointer", a pointer is a variable that stores the address of another variable.The dereference operator is also known as an indirection operator, which is represented by (*). 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. Through community-led open-source software projects, hundreds of local chapters worldwide, tens of thousands of members, and leading educational and training conferences, the OWASP Foundation is the source for . Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. 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. For an attacker it provides an opportunity to stress the system in unexpected ways. 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 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. The Java VM sets them so, as long as Java isn't corrupted, you're safe. Is DPAPI still valid option to protect eg. Java/JSP. 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. : 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. 10 Avoiding Attempt to Dereference Null Object Errors 4,029 views Oct 22, 2014 In this episode we look at 3 common ways to get - and then prevent - the "Attempt to dereference a null object". An API is a contract between a caller and a callee. Do new devs get fired if they can't solve a certain bug? privacy statement. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. It could be either removed or replaced. to your account. 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. rev2023.3.3.43278. -Wnull-dereference. But it seems that fortify is not considering these checks as a valid null check. #icon8226{font-size:;background:;padding:;border-radius:;color:;} 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. Note that this code is also vulnerable to a buffer overflow . How Intuit democratizes AI development across teams through reusability. vent ever possible null dereference. to fix over 7500 defects across 250 open source projects and 50 million lines of code. if (foo == null) { foo.setBar (val); . } Even if you were to add input filtering, the odds are low that Fortify were to recognize it and stop producing the issue. It would probably help prioritizing a fix if you could attach your repro code. 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. But it seems that fortify is not considering these checks as a valid null check. All rights reserved. #icon876{font-size:;background:;padding:;border-radius:;color:;} Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. ][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(?) 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. 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. They are not only hard to identify but also complex to deal with. 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. Pseudo-Random Number Generators (PRNGs) approximate randomness algorithmically, starting with a seed from . Teams. Software Security | Null Dereference Kingdom: Code Quality Poor code quality leads to unpredictable behavior. If you have encountered it a lot, that just means it is a popular misconception . a NULL pointer dereference would then occur in the call to strcpy(). Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. Null Dereference Analysis in Practice Nathaniel Ayewah Dept. \Projects\UnreleasedStream> java HttpURLConnectionReader http != null inputStream != null Exception: java.io.IOExpection: stream is closed http != null inputStream != null . 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. Redundant Check For Null Check the JavaDoc for the method Performs a lookup operation on a Raster. (and obviously if httpInputStream is different from null, to avoid a possible Null Dereference by invoking the close() method). But, when you try to declare a reference type, something different happens. 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. 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. 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. I need to read the properties file kept in user home folder. Null Dereference C/C++ C#/VB.NET/ASP.NET Java/JSP Abstract clones. Fortify: Access Control Database related issue. to fix over 7500 defects across 250 open source projects and 50 million lines of code. Attack Signatures. Asking for help, clarification, or responding to other answers. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. 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.
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