how to fix null dereference in java fortify

2nd Edition. This MemberOf Relationships table shows additional CWE Categories and Views that reference this weakness as a member. 2019-07-15. environment so that cmd is not defined, the program throws a null The most common forms of API abuse are caused by the caller failing to honor its end of this contract. Avoid Returning null from Methods. Wikipedia. Connection conn = null; Boolean myConn = false; try { if (conn == null) { conn = DatabaseUtil.getConnection (); myConn = true; } result = DbClass.getObject (conn, otherParameters); }catch (DatabaseException de) { throw de; }catch (SQLException sqle) { throw new DatabaseException ("Error Message"); }finally { if (myConn && conn != null) { try { For more information, please refer to our General Disclaimer. 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 But we have observed in practice that not every potential null dereference is a bug that developers want to fix. The TOP 25 Errors List will be updated regularly and will be posted at both the SANS and MITRE sites. The following code does not check to see if the string returned by the Item property is null before calling the member function Equals(), potentially causing a NULL dereference. [REF-44] Michael Howard, David LeBlanc In the following example, it is possible to request that memcpy move a much larger segment of memory than assumed: If returnChunkSize() happens to encounter an error it will return -1. David LeBlanc. The following Java Virtual Machine versions are supported: Java 8; Java 11; Java 17; while may produce spurious null dereference reports. In this tutorial, we'll take a look at the need to check for null in Java and various alternatives that . The platform is listed along with how frequently the given weakness appears for that instance. High severity (5.3) NULL Pointer Dereference in java-1.8.-openjdk-accessibility | CVE-2021-35578 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. About an argument in Famine, Affluence and Morality. 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. Pillar - a weakness that is the most abstract type of weakness and represents a theme for all class/base/variant weaknesses related to it. 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. . Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values. 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 Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. NIST. For example, In the ClassWriter class, a call is made to the set method of an Item object. Note that this code is also vulnerable to a buffer overflow . The Scope identifies the application security area that is violated, while the Impact describes the negative technical impact that arises if an adversary succeeds in exploiting this weakness. More specific than a Base weakness. Server allows remote attackers to cause a denial of service (crash) via malformed requests that trigger a null dereference. vegan) just to try it, does this inconvenience the caterers and staff? If the program is performing an atomic operation, it can leave the system in an inconsistent state. This behavior makes it important for programmers to examine the return value from read() and other IO methods to ensure that they receive the amount of data they expect. Stringcmd=System.getProperty("cmd"); This is an example of a Project or Chapter Page. Harvest Property Management Lodi, Ca, By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Improper Check for Unusual or Exceptional Conditions, Error Conditions, Return Values, Status Codes, OWASP Top Ten 2004 Category A7 - Improper Error Handling, CERT C Secure Coding Standard (2008) Chapter 9 - Memory Management (MEM), The CERT Oracle Secure Coding Standard for Java (2011) Chapter 4 - Expressions (EXP), CERT C++ Secure Coding Section 08 - Memory Management (MEM), SFP Secondary Cluster: Unchecked Status Condition, CISQ Quality Measures (2016) - Reliability, SEI CERT Oracle Secure Coding Standard for Java - Guidelines 02. But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. Microsoft Press. This table specifies different individual consequences associated with the weakness. LKML Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH] dm: fix dax_dev NULL dereference @ 2019-07-30 11:37 Pankaj Gupta 2019-07-30 11:38 ` Pankaj Gupta 0 siblings, 1 reply; 7+ messages in thread From: Pankaj Gupta @ 2019-07-30 11:37 UTC (permalink / raw) To: snitzer, dan.j.williams Cc: dm-devel, linux-nvdimm, linux-fsdevel, linux-kernel, agk, pagupta 'Murphy Zhou' reports . "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". The Java VM sets them so, as long as Java isn't corrupted, you're safe. 2005-11-07. Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers), Minimising the environmental effects of my dyson brain. System.clearProperty ("os.name"); . These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. 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. If an attacker can control the programs Real ghetto African girls smoking with their pussies. These may be for specific named Languages, Operating Systems, Architectures, Paradigms, Technologies, or a class of such platforms. Time arrow with "current position" evolving with overlay number, Doubling the cube, field extensions and minimal polynoms. 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. These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. The two main view structures are Slices (flat lists) and Graphs (containing relationships between entries). When designing a function, make sure you return a value or throw an exception in case of an error. and Gary McGraw. 2010. The code loops through a set of users, reading a private data file for each user. "Automated Source Code Security Measure (ASCSM)". Cross-Session Contamination. Take the following code: Integer num; num = new Integer(10); So you have a couple of choices: Ignore the warning. Chains can involve more than two weaknesses, and in some cases, they might have a tree-like structure. Chapter 7, "Program Building Blocks" Page 341. For trivial true positives, these are ones that just never need to be fixed. sanity-checked previous to use, nearly all null-pointer dereferences An API is a contract between a caller and a callee. What is the difference between public, protected, package-private and private in Java? large number of packets leads to NULL dereference, packet with invalid error status value triggers NULL dereference, Chain: race condition for an argument value, possibly resulting in NULL dereference. Unfortunately our Fortify scan takes several hours to run. 3.7. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. Asking for help, clarification, or responding to other answers. String URL = intent.getStringExtra("URLToOpen"); race condition causes a table to be corrupted if a timer activates while it is being modified, leading to resultant NULL dereference; also involves locking. rev2023.3.3.43278. Instead use String.valueOf (object). 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. 2006. Availability: Null-pointer dereferences invariably result in the This user is already logged in to another session. How can I find out which sectors are used by files on NTFS? For example, the owner may be momentarily null even if there are threads trying to acquire the lock but have not yet done so . 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. PVS-Studio is a tool for detecting bugs and security weaknesses in the source code of programs, written in C, C++, C# and Java. In addition, relationships such as PeerOf and CanAlsoBe are defined to show similar weaknesses that the user may want to explore. "The Art of Software Security Assessment". 1st Edition. This table shows the weaknesses and high level categories that are related to this weakness. View - a subset of CWE entries that provides a way of examining CWE content. "Automated Source Code Reliability Measure (ASCRM)". . pointer exception when it attempts to call the trim() method. A null-pointer dereference takes place when a pointer with a value of 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. Dynamic analysis is a great way to uncover error-handling flaws. The program can potentially dereference a null-pointer, thereby raising a NullException. Another good example of library abuse is expecting the callee to return trustworthy DNS information to the caller. Category:Code Quality junio 12, 2022. abc news anchors female philadelphia . 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. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. The platform is listed along with how frequently the given weakness appears for that instance. SSL software allows remote attackers to cause a denial of service (crash) via a crafted SSL/TLS handshake that triggers a null dereference. 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. Redundant Null Check. "Security problems caused by dereferencing null . It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. Browse other questions tagged java fortify or ask your own question. NIST. Fix: Added if block around the close call at line 906 to keep this from being . They will always result in the crash of the 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. It serves as a common language, a measuring stick for security tools, and as a baseline for weakness identification, mitigation, and prevention efforts. The unary prefix ! Fortify is complaining about a Null Dereference when I set a field to null: But that seems really silly. chain: unchecked return value can lead to NULL dereference. Check the results of all functions that return a value and verify that the value is non-null before acting upon it. Concatenating a string with null is safe. Making statements based on opinion; back them up with references or personal experience. Description. In both of these situations, fgets() signals that something unusual has happened by returning NULL, but in this code, the warning will not be noticed. One weakness, X, can directly create the conditions that are necessary to cause another weakness, Y, to enter a vulnerable condition. It is impossible for the program to perform a graceful exit if required. Java (Undetermined Prevalence) C# (Undetermined Prevalence) Common Consequences. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. My code is GPL licensed, can I issue a license to have my code be distributed in a specific MIT licensed project? This information is often useful in understanding where a weakness fits within the context of external information sources. 2016-01. Check the results of all functions that return a value and verify that the value is expected. Without handling the error, there is no way to know. When it comes to these specific properties, you're safe. 2016-01. 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? 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 To subscribe to this RSS feed, copy and paste this URL into your RSS reader. will be valuable in planning subsequent attacks. 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. 10 Avoiding Attempt to Dereference Null Object Errors - YouTube 0:00 / 8:00 10 Avoiding Attempt to Dereference Null Object Errors 4,029 views Oct 22, 2014 In this episode we look at 3 common. Example . 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. Ie, do you want to know how to fix a vulnerability (this is well-covered, and you should do some research before asking a more concrete question), or do you want to know how to suppress a false-positive (this would likely be off-topic, you should just ask the vendor)? CWE is sponsored by the U.S. Department of Homeland Security (DHS) Cybersecurity and Infrastructure Security Agency (CISA) and managed by the Homeland Security Systems Engineering and Development Institute (HSSEDI) which is operated by The MITRE Corporation (MITRE). that is linked to a certain type of product, typically involving a specific language or technology. 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. The different Modes of Introduction provide information about how and when this weakness may be introduced. CODETOOLS-7900081 Fortify: Analize and fix "Null Dereference" issues. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? It's simply a check to make sure the variable is not null. There is no guarantee that the amount of data returned is equal to the amount of data requested. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. Category - a CWE entry that contains a set of other entries that share a common characteristic. public class MyClass {. By using this site, you accept the Terms of Use and Rules of Participation. <. Fix: Added if block around the close call at line 906 to keep this from being 3 FortifyJava 8 - Fortify : Null dereference for Java 8 Java 8 fortify Null Dereference null Common Weakness Enumeration. (Or use the ternary operator if you prefer). vegan) just to try it, does this inconvenience the caterers and staff? Two common programmer assumptions are "this function call can never fail" and "it doesn't matter if this function call fails". The same occurs with the presence of every form in html/jsp (x)/asp (x) page, that are suspect of CSRF weakness. Unless otherwise specified, all content on the site is Creative Commons Attribution-ShareAlike v4.0 and provided without warranty of service or accuracy. even then, little can be done to salvage the process. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. ASCRM-CWE-252-resource. 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. operator is the null-forgiving, or null-suppression, operator. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. Use automated static analysis tools that target this type of weakness. To learn more, see our tips on writing great answers. Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) We recreated the patterns in a small tool and then performed comparative analysis. can be prevented. If you preorder a special airline meal (e.g. 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 (. The program can dereference a null-pointer because it does not check the return value of a function that might return null. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. In this case, the caller abuses the callee API by making certain assumptions about its behavior (that the return value can be used for authentication purposes). NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. 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. If it does not exist, the program cannot perform the desired behavior so it doesn't matter whether I handle the error or allow the program to die dereferencing a null value." While there Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. 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 Implementation: Proper sanity checks at implementation time can A Community-Developed List of Software & Hardware Weakness Types, Class: Not Language-Specific (Undetermined Prevalence), Technical Impact: Unexpected State; DoS: Crash, Exit, or Restart. If an attacker can force the function to fail or otherwise return a value that is not expected, then the subsequent program logic could lead to a vulnerability, because the product is not in a state that the programmer assumes. ( A girl said this after she killed a demon and saved MC). Or was it caused by a memory leak that has built up over time? Note that this code is also vulnerable to a buffer overflow (CWE-119). -Wnonnull-compare is included in -Wall. 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. Base - a weakness Browse other questions tagged java fortify or ask your own question. Dereferencing follows the memory address stored in a reference, to the place in memory where the actual object resides. The annotations will help SCA to reduce false negative or false positive security issues thus increasing the accuracy of the report. In this paper we discuss some of the challenges of using a null dereference analysis in . including race conditions and simple programming omissions. Did the call to malloc() fail because req_size was too large or because there were too many requests being handled at the same time? What is the point of Thrower's Bandolier? <, [REF-962] Object Management Group (OMG). What is the correct way to screw wall and ceiling drywalls? does pass the Fortify review. Show activity on this post. clones. corrected in a simple way. PS: Yes, Fortify should know that these properties are secure. Cookie Security. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. that is still mostly independent of a resource or technology, but with sufficient details to provide specific methods for detection and prevention. For example, there may be high likelihood that a weakness will be exploited to achieve a certain impact, but a low likelihood that it will be exploited to achieve a different impact. Category - a CWE entry that contains a set of other entries that share a common characteristic. I think I know why I'm getting it , just wanted to know what would be the best way to fix the issue. This solution passes the Fortify scan. A null-pointer dereference takes place when a pointer with a value of NULL is used as though it pointed to a valid memory area. environment, ensure that proper locking APIs are used to lock before the (where the weakness is a quality issue that might indirectly make it easier to introduce security-relevant weaknesses or make them more difficult to detect). In .NET, it is not uncommon for programmers to misunderstand Read() and related methods that are part of many System.IO classes. The Java VM sets them so, as long as Java isn't corrupted, you're safe. 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. Dereference before null check (REVERSE_INULL) There may be a null pointer exception, or else the comparison against null is unnecessary. Team Collaboration and Endpoint Management. Take the following code: Integer num; num = new Integer(10); Cross-Client Data Access. Address the Null Dereference issues identified by the Fortify scan. [REF-6] Katrina Tsipenyuk, Brian Chess Palash Sachan 8-Feb-17 13:41pm. A Community-Developed List of Software & Hardware Weakness Types, Technical Impact: DoS: Crash, Exit, or Restart, Technical Impact: Execute Unauthorized Code or Commands; Read Memory; Modify Memory. 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. This code will definitely crash due to a null pointer dereference in certain cases. View Defect : wazuh/ossec-wazuh: USE_AFTER_FREE: C/C++: Coverity's suggestion to fix this bug is to use a delete[] deallocator, but the concerned file is in Null 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. What video game is Charlie playing in Poker Face S01E07? But we have observed in practice that not every potential null dereference is a "bug " that developers want to fix. Program does not check return value when invoking functions to drop privileges, which could leave users with higher privileges than expected by forcing those functions to fail. The following VB.NET code does not check to make sure that it has read 50 bytes from myfile.txt. Deerlake Middle School Teachers, (Java) and to compare it with existing bug reports on the tool to test its efficacy. 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. Alle rechten voorbehouden. If an attacker can control the program's environment so that "cmd" is not defined, the program throws a NULL pointer exception when it attempts to call the trim() method. This table specifies different individual consequences associated with the weakness. Calculating probabilities from d6 dice pool (Degenesis rules for botches and triggers). Fortify Software in partnership with FindBugs has launched the Java Open Review (JOR) Project. Is this from a fortify web scan, or from a static code analysis? 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. Just about every serious attack on a software system begins with the violation of a programmer's assumptions. 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, . 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. "Writing Secure Code". is incorrect. Web-application scanning, also known as dynamic analysis, is a type of test that runs while an application is in a development environment. 2016-01. Content Provider URI Injection. To learn more, see our tips on writing great answers. void host_lookup(char *user_supplied_addr){, if("com.example.URLHandler.openURL".equals(intent.getAction())) {. How do I efficiently iterate over each entry in a Java Map? attacker can intentionally trigger a null pointer dereference, the The program can potentially dereference a null pointer, thereby raising Fix: Commented out the debug lines to the logger. If you can guaranty this, then the empty List is even better, as it does not create a new object all the time. (Generated from version 2022.1.0.0007 of the Fortify Secure Coding Rulepacks) Exceptions. caught at night in PUBLIC POOL!!! Thierry's answer works great. 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. 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. 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. Double-check the stack trace of the exception, and also check the surrounding lines in case the line number is wrong. Connect and share knowledge within a single location that is structured and easy to search. <. Is Java "pass-by-reference" or "pass-by-value"? Find centralized, trusted content and collaborate around the technologies you use most. What's the difference between a power rail and a signal line? 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 would fail on this unmodifiable List. ssh component for Go allows clients to cause a denial of service (nil pointer dereference) against SSH servers. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Thanks for contributing an answer to Stack Overflow! Java/JSP. For an attacker it provides an opportunity to stress the system in unexpected ways. Note that this code is also vulnerable to a buffer overflow (CWE-119). Why are trials on "Law & Order" in the New York Supreme Court? When to use LinkedList over ArrayList in Java? The program can dereference a null-pointer because it does not check the return value of a function that might return null. <, [REF-18] Secure Software, Inc.. "The CLASP Application Security Process". and John Viega. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. Thank you for visiting OWASP.org. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks.

how to fix null dereference in java fortify 2023