how to fix null dereference in java fortify

The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). Expressions (EXP), SEI CERT C Coding Standard - Guidelines 03. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. Chapter 7, "Program Building Blocks" Page 341. Category:Vulnerability. Base - a weakness Connect and share knowledge within a single location that is structured and easy to search. An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. Fortify found 2 "Null Dereference" issues. Find centralized, trusted content and collaborate around the technologies you use most. If an attacker can create a smaller file, the program will recycle the remainder of the data from the previous user and treat it as though it belongs to the attacker. This listing shows possible areas for which the given weakness could appear. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. When this method is called by a thread that is not the owner, the return value reflects a best-effort approximation of current lock status. SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. If you can guaranty this, then the empty List is even better, as it does not create a new object all the time. Copyright 20062023, The MITRE Corporation. Or was it caused by a memory leak that has built up over time? Fixed by #302 Contributor 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 Fortify-Issue-300 Null Dereference issues #302 Merged For more information, please refer to our General Disclaimer. String itemName = request.getParameter(ITEM_NAME); String itemName = request.Item(ITEM_NAME); Dim MyFile As New FileStream("myfile.txt", FileMode.Open, FileAccess.Read, FileShare.Read), void host_lookup(char *user_supplied_addr){, Chain: The return value of a function returning a pointer is not checked for success (, Chain: sscanf() call is used to check if a username and group exists, but the return value of sscanf() call is not checked (. Another good example of library abuse is expecting the callee to return trustworthy DNS information to the caller. This table specifies different individual consequences associated with the weakness. Alternate Terms Relationships Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. How Intuit democratizes AI development across teams through reusability. C#/VB.NET/ASP.NET. Follow Up: struct sockaddr storage initialization by network format-string. The program can dereference a null-pointer because it does not check the return value of a function that might return null. A null-pointer dereference takes place when a pointer with a value of The following code uses Java's SecureRandom class to generate a cryptographically strong pseudo-random number (DO THIS): public static int generateRandom (int maximumValue) { SecureRandom ranGen = new SecureRandom (); return ranGen.nextInt (maximumValue); } Edit on GitHub 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. What are the differences between a HashMap and a Hashtable in Java? 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. Improper Check for Unusual or Exceptional Conditions, Unchecked Return Value to NULL Pointer Dereference, Memory Allocation with Excessive Size Value, Improperly Controlled Sequential Memory Allocation, OWASP Top Ten 2004 Category A9 - Denial of Service, CERT C Secure Coding Standard (2008) Chapter 4 - Expressions (EXP), CERT C Secure Coding Standard (2008) Chapter 9 - Memory Management (MEM), CERT C++ Secure Coding Section 03 - Expressions (EXP), CERT C++ Secure Coding Section 08 - Memory Management (MEM), SFP Secondary Cluster: Faulty Pointer Use, SEI CERT Oracle Secure Coding Standard for Java - Guidelines 02. The SAST tool used was Fortify SCA, (and obviously if httpInputStream is different from null, to avoid a possible Null Dereference by invoking the close() method). . NULL pointer dereferences are frequently resultant from rarely encountered error conditions, since these are most likely to escape detection during the testing phases. Since the code does not check the return value from gethostbyaddr (CWE-252), a NULL pointer dereference (CWE-476) would then occur in the call to strcpy(). 2019-07-15. "Sin 11: Failure to Handle Errors Correctly." Chain: Use of an unimplemented network socket operation pointing to an uninitialized handler function (, Chain: race condition might allow resource to be released before operating on it, leading to NULL dereference, Chain: some unprivileged ioctls do not verify that a structure has been initialized before invocation, leading to NULL dereference, Chain: IP and UDP layers each track the same value with different mechanisms that can get out of sync, possibly resulting in a NULL dereference, Chain: uninitialized function pointers can be dereferenced allowing code execution, Chain: improper initialization of memory can lead to NULL dereference, Chain: game server can access player data structures before initialization has happened leading to NULL dereference, Chain: The return value of a function returning a pointer is not checked for success (, Chain: a message having an unknown message type may cause a reference to uninitialized memory resulting in a null pointer dereference (, Chain: unchecked return value can lead to NULL dereference. In rare circumstances, when NULL is equivalent to the 0x0 memory address and privileged code can access it, then writing or reading memory is possible, which may lead to code execution. If an attacker provides an address that appears to be well-formed, but the address does not resolve to a hostname, then the call to gethostbyaddr() will return NULL. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. getAuth() should not return null.A method returning a List should per convention never return null but an empty List as default "empty" value.. private List getAuth(){ return new ArrayList<>(); } java.util.Collections.emptyList() should only be used, if you are sure that every caller of the method does not change the list (does not try to add any items), as this 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. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. Cookie Security. Take the following code: Integer num; num = new Integer(10); Cross-Client Data Access. Convert byte[] to String (text data) The below example convert a string to a byte array or byte[] and vice versa. are no complete fixes aside from contentious programming, the following The opinions expressed above are the personal opinions of the authors, not of Micro Focus. how to fix null dereference in java fortify how to fix null dereference in java fortify . NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Denial of service Flooding Resource exhaustion Sustained client engagement Denial of service problems in C# Infinite loop Economic Denial of Sustainability (EDoS) Amplification Other amplification examples There are too few details in this report for us to be able to work on it. This way you initialize sortName only once, and explicitely show that a null value is the right one in some cases, and not that you forgot some cases, leading to a var staying null while it is unexpected. Here is a code snippet: 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 Java Null Dereference when setting a field to null - Fortify, How Intuit democratizes AI development across teams through reusability. a NULL pointer dereference would then occur in the call to strcpy(). Notice that the return value is not checked before the memcpy operation (CWE-252), so -1 can be passed as the size argument to memcpy() (CWE-805). The text was updated successfully, but these errors were encountered: cmheazel self-assigned this Jan 8, 2018 The best way to avoid memory leaks in C++ is to have as few new/delete calls at the program level as possible ideally NONE. This user is already logged in to another session. Redundant Null Check. Is a PhD visitor considered as a visiting scholar? 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. Fix: Commented out the debug lines to the logger. In the following code, the programmer assumes that the system always has which best describes the pillbugs organ of respiration; jesse pearson obituary; ion select placeholder color; best fishing spots in dupage county The stream and reader classes do not consider it to be unusual or exceptional if only a small amount of data becomes available. 2016-01. Note that this code is also vulnerable to a buffer overflow (CWE-119). Is Java "pass-by-reference" or "pass-by-value"? Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. La Segunda Vida De Bree Tanner. A password reset link will be sent to you by email. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') -Wnull-dereference. It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. NIST. citrus county livestock regulations; how many points did klay thompson score last night. This can cause DoDangerousOperation() to operate on an unexpected value. [REF-62] Mark Dowd, John McDonald set them to NULL once they are freed: If you are working with a multi-threaded or otherwise asynchronous Network monitor allows remote attackers to cause a denial of service (crash) or execute arbitrary code via malformed packets that cause a NULL pointer dereference. Take the following code: Integer num; num = new Integer(10); of Computer Science University of Maryland College Park, MD ayewah@cs.umd.edu William Pugh Dept. How can we prove that the supernatural or paranormal doesn't exist? Microsoft Press. Asking for help, clarification, or responding to other answers. This example takes an IP address from a user, verifies that it is well formed and then looks up the hostname and copies it into a buffer. This table shows the weaknesses and high level categories that are related to this weakness. I'll update as soon as I have more information thx Thierry. how many points did klay thompson score last night, keller williams luxury listing presentation, who died in the manchester united plane crash, what does the bible say about feeding birds, Penticton Regional Hospital Diagnostic Imaging, Clark Atlanta University Music Department, is the character amos decker black or white. In this paper we discuss some of the challenges of using a null It is equivalent to the following code: result = s Is Nothing OrElse s = String.Empty. 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. Network monitor allows remote attackers to cause a denial of service (crash) via a malformed RADIUS packet that triggers a null dereference. Take the following code: Integer num; num = new Integer(10); So you have a couple of choices: Ignore the warning. They are not necessary and expose risk according to the Fortify scan. Is there a single-word adjective for "having exceptionally strong moral principles"? Not the answer you're looking for? This Android application has registered to handle a URL when sent an intent: The application assumes the URL will always be included in the intent. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The best way to fix this is not returning, @MarkRotteveel those are from different classes, is there a way to return an empty list that will not cause null dereference? <. Note that this code is also vulnerable to a buffer overflow . process, unless exception handling (on some platforms) is invoked, and CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues. These classes simply add the small amount of data to the return buffer, and set the return value to the number of bytes or characters read. A force de persvrance et de courage, la petite fourmi finit par arriver au sommet de la montagne. 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 July 2019. pylint. Cross-Session Contamination. 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. Can archive.org's Wayback Machine ignore some query terms? Why are non-Western countries siding with China in the UN? This also passes Fortify's scan: Thanks for contributing an answer to Stack Overflow! The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. Category - a CWE entry that contains a set of other entries that share a common characteristic. Alle links, video's en afbeeldingen zijn afkomstig van derden. This solution passes the Fortify scan. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. NULL is used as though it pointed to a valid memory area. Harvest Property Management Lodi, Ca, Network monitor allows remote attackers to cause a denial of service (crash) via a malformed Q.931, which triggers a null dereference. operator is the null-forgiving, or null-suppression, operator. one or more programmer assumptions being violated. Does a summoned creature play immediately after being summoned by a ready action? caught at night in PUBLIC POOL!!! Deerlake Middle School Teachers, The program might dereference a null-pointer because it does not check the return value of a function that might return null. Fortify SCA is used to find and fix following software vulnerabilities at the root cause: Buffer Overflow, Command Injection, Cross-Site Scripting, Denial of Service, Format String, Integer Overflow, . Once you are fixing issues automatically (not all issues will be like this, so focus on certain always-true positives with standardized remediation that can be code generated through high-fidelity qualities), then you can turn your attention towards trivial true positives. The method isXML in jquery-1.4.4.js can dereference a null pointer on line 4283, thereby raising a NullExcpetion. 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. getAuth() should not return null.A method returning a List should per convention never return null but an empty List as default "empty" value.. private List, how to fix null dereference in java fortify 2022, Birthday Wishes For 14 Year Old Son From Mother. cmd=cmd.trim(); Null-pointer dereference issues can occur through a number of flaws, Ensure that you account for all possible return values from the function. vegan) just to try it, does this inconvenience the caterers and staff? It doesn't matter whether I handle the error or allow the program to die with a segmentation fault when it tries to dereference the null pointer." OWASP, the OWASP logo, and Global AppSec are registered trademarks and AppSec Days, AppSec California, AppSec Cali, SnowFROC, and LASCON are trademarks of the OWASP Foundation, Inc. The Null dereference error was on the line of code sortName = lastName; not the call of the setter : fortify do not want you to conditionnally change the value of a variable that was set to null without doing so in all the branches. -Wnull-dereference. It should be investigated and fixed OR suppressed as not a bug. In order to avoid data races, correctly written programs must check the result of thread synchronization functions and appropriately handle all errors, either by attempting to recover from them or reporting them to higher levels. "Writing Secure Code". Anyone have experience with this one? 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. "Security problems caused by dereferencing null . "Automated Source Code Reliability Measure (ASCRM)". Stringcmd=System.getProperty("cmd"); To learn more, see our tips on writing great answers. 2005-11-07. This is not a perfect solution, since 100% accuracy and coverage are not feasible. What is the correct way to screw wall and ceiling drywalls? Example . Class - a weakness that is described in a very abstract fashion, typically independent of any specific language or technology. CWE, CWSS, CWRAF, and the CWE logo are trademarks of The MITRE Corporation. -Wnonnull-compare is included in -Wall. including race conditions and simple programming omissions.