how to fix null dereference in java fortify

While there 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 program can dereference a null-pointer because it does not check the return value of a function that might return null. 2019-07-15. 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 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. occur. 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. Furthermore, if the end of the file is reached before any characters are read, fgets() returns without writing anything to buf. Connection String Parameter Pollution. It's simply a check to make sure the variable is not null. Het is gebruikers verboden materiaal te plaatsen waarop personen jonger dan 18 jaar worden afgebeeld. Redundant Null Check. 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. Team Collaboration and Endpoint Management. The different Modes of Introduction provide information about how and when this weakness may be introduced. The Phase identifies a point in the life cycle at which introduction may occur, while the Note provides a typical scenario related to introduction during the given phase. rev2023.3.3.43278. 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. Note that this code is also vulnerable to a buffer overflow (CWE-119). [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 - NIST Special Publication 800-53 Revision 4, [9] Standards Mapping - NIST Special Publication 800-53 Revision 5, [10] Standards Mapping - OWASP Top 10 2004, [11] Standards Mapping - OWASP Application Security Verification Standard 4.0, [12] Standards Mapping - Payment Card Industry Data Security Standard Version 1.1, [13] Standards Mapping - Security Technical Implementation Guide Version 3.1, [14] Standards Mapping - Security Technical Implementation Guide Version 3.4, [15] Standards Mapping - Security Technical Implementation Guide Version 3.5, [16] Standards Mapping - Security Technical Implementation Guide Version 3.6, [17] Standards Mapping - Security Technical Implementation Guide Version 3.7, [18] Standards Mapping - Security Technical Implementation Guide Version 3.9, [19] Standards Mapping - Security Technical Implementation Guide Version 3.10, [20] Standards Mapping - Security Technical Implementation Guide Version 4.1, [21] Standards Mapping - Security Technical Implementation Guide Version 4.2, [22] Standards Mapping - Security Technical Implementation Guide Version 4.3, [23] Standards Mapping - Security Technical Implementation Guide Version 4.4, [24] Standards Mapping - Security Technical Implementation Guide Version 4.5, [25] Standards Mapping - Security Technical Implementation Guide Version 4.6, [26] Standards Mapping - Security Technical Implementation Guide Version 4.7, [27] Standards Mapping - Security Technical Implementation Guide Version 4.8, [28] Standards Mapping - Security Technical Implementation Guide Version 4.9, [29] Standards Mapping - Security Technical Implementation Guide Version 4.10, [30] Standards Mapping - Security Technical Implementation Guide Version 4.11, [31] Standards Mapping - Security Technical Implementation Guide Version 5.1, [32] Standards Mapping - Web Application Security Consortium 24 + 2, [33] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.dotnet.missing_check_against_null, desc.controlflow.java.missing_check_against_null, (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. 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. 2.1. Time arrow with "current position" evolving with overlay number, Doubling the cube, field extensions and minimal polynoms. If you trigger an unhandled exception or similar error that was discovered and handled by the application's environment, it may still indicate unexpected conditions that were not handled by the application itself. 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 . <, [REF-962] Object Management Group (OMG). La Segunda Vida De Bree Tanner. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. The program can dereference a null-pointer because it does not check the return value of a function that might return null. Note that this code is also vulnerable to a buffer overflow . : Fortify: The method processMessage() in VET360InboundProcessService.java can crash the program by dereferencing a null pointer on line 197. What fortify do not like is the fact that you initialize the variable with null first, without condition, and then change it. For trivial true positives, these are ones that just never need to be fixed. and Gary McGraw. Null-pointer dereferences, while common, can generally be found and corrected in a simple way. POSIX (POS), SEI CERT Perl Coding Standard - Guidelines 03. NULL pointer dereferences usually result in the failure of the process unless exception handling (on some platforms) is available and implemented. Suppress the warning (if Fortify allows that). 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. failure of the process. steps will go a long way to ensure that null-pointer dereferences do not It is important to remember here to return the literal and not the char being checked. how to fix null dereference in java fortify. 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. The program can potentially dereference a null-pointer, thereby raising a NullPointerException. The opinions expressed above are the personal opinions of the authors, not of Micro Focus. 2. When this happens, CWE refers to X as "primary" to Y, and Y is "resultant" from X. "Seven Pernicious Kingdoms: A Taxonomy of Software Security Errors". chain: unchecked return value can lead to NULL dereference. Addison Wesley. 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(). Closed. In this paper we discuss some of the challenges of using a null dereference analysis in . Agissons ici, pour que a change l-bas ! Expressions (EXP), SEI CERT C Coding Standard - Guidelines 12. does pass the Fortify review. Fix: Added if block around the close call at line 906 to keep this from being . These relationships are defined as ChildOf, ParentOf, MemberOf and give insight to similar items that may exist at higher and lower levels of abstraction. Penticton Regional Hospital Diagnostic Imaging, Warn if the compiler detects paths that trigger erroneous or undefined behavior due to dereferencing a null pointer. Ensure that you account for all possible return values from the function. Extended Description NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions. [REF-62] Mark Dowd, John McDonald 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. Anything that requires dynamic memory should be buried inside an RAII object that releases the memory when it goes out of scope. 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. 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, (Java) and to compare it with existing bug reports on the tool to test its efficacy. Il suffit de nous contacter ! The call cr.getPassword() may return null value in the com.hazelcast.client.connection.nio.ClientConnectionManagerImpl.encodeAuthenticationRequest(boolean, SerializationService, ClientPrincipal) method. Take the following code: Integer num; num = new Integer(10); However, its // behavior isn't consistent. Class level weaknesses typically describe issues in terms of 1 or 2 of the following dimensions: behavior, property, and resource. While there are no complete fixes aside from conscientious programming, the following steps will go a long way to ensure that NULL pointer dereferences do not occur. Expressions (EXP), https://samate.nist.gov/SSATTM_Content/papers/Seven%20Pernicious%20Kingdoms%20-%20Taxonomy%20of%20Sw%20Security%20Errors%20-%20Tsipenyuk%20-%20Chess%20-%20McGraw.pdf, https://www.microsoftpressstore.com/store/writing-secure-code-9780735617223, Cybersecurity and Infrastructure Security Agency, Homeland Security Systems Engineering and Development Institute, Detect and handle standard library errors, The CERT Oracle Secure Coding Standard for Java (2011), Provided Demonstrative Example and suggested CERT reference, updated Common_Consequences, Relationships, Other_Notes, Taxonomy_Mappings, updated Background_Details, Demonstrative_Examples, Description, Observed_Examples, Other_Notes, Potential_Mitigations, updated Common_Consequences, Demonstrative_Examples, References, updated Demonstrative_Examples, Potential_Mitigations, References, updated Demonstrative_Examples, References, updated Common_Consequences, Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Common_Consequences, References, Relationships, updated Demonstrative_Examples, Potential_Mitigations, updated Demonstrative_Examples, Relationships, Taxonomy_Mappings, updated Applicable_Platforms, References, Relationships, Taxonomy_Mappings, updated References, Relationships, Taxonomy_Mappings, updated Demonstrative_Examples, Observed_Examples, Relationships, Weakness_Ordinalities. If pthread_mutex_lock() cannot acquire the mutex for any reason, the function may introduce a race condition into the program and result in undefined behavior. This also passes Fortify's scan: Thanks for contributing an answer to Stack Overflow! cmd=cmd.trim(); Null-pointer dereference issues can occur through a number of flaws, Most errors and unusual events in Java result in an exception being thrown. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, what happens if, just for testing, you do. Many modern techniques use data flow analysis to minimize the number of false positives. An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors. 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. and Gary McGraw. A Pillar is different from a Category as a Pillar is still technically a type of weakness that describes a mistake, while a Category represents a common characteristic used to group related things. This website uses cookies to analyze our traffic and only share that information with our analytics partners. Dereference before null check (REVERSE_INULL) There may be a null pointer exception, or else the comparison against null is unnecessary. The Likelihood provides information about how likely the specific consequence is expected to be seen relative to the other consequences in the list. The software's operation may slow down, but it should not become unstable, crash, or generate incorrect results. Notice how that can never be possible since the method returns early with a 'false' value on the previous 'if' statement. 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. Even when exception handling is being used, it can still be very difficult to return the software to a safe state of operation. 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. Explanation Null-pointer errors are usually the result of one or more programmer assumptions being violated. [REF-6] Katrina Tsipenyuk, Brian Chess Revolution Radio With Scott Mckay, Common Weakness Enumeration. CODETOOLS-7900078 Fortify: Analize and fix "Redundant Null Check" issues. 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. Certain versions of content ("Material") accessible here may contain branding from Hewlett-Packard Company (now HP Inc.) and Hewlett Packard Enterprise Company. (Generated from version 2022.4.0.0009 of the Fortify Secure Coding Rulepacks), Fortify Taxonomy: Software Security Errors. Null pointers null dereference null dereference best practices Using Nullable type parameters Memory leak Unmanaged memory leaks. Null-pointer exceptions usually occur when one or more of the programmer's assumptions is violated. Veracode's dynamic analysis scan automates the process, returning detailed guidance on security flaws to help developers fix them for good. logic or to cause the application to reveal debugging information that This table specifies different individual consequences associated with the weakness. Check the documentation for the Connection object of the type returned by the getConnection() factory method, and see if the methods rollback() and close() Null Dereference. 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. Clark Atlanta University Music Department, But the stream and reader classes do not consider it unusual or exceptional if only a small amount of data becomes available. Added Fortify's analysis trace, which is showing that the dereference of sortName is the problem. 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. 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? 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. [1] J. Viega, G. McGraw Building Secure Software Addison-Wesley, [2] Standards Mapping - Common Weakness Enumeration, [3] Standards Mapping - Common Weakness Enumeration Top 25 2019, [4] Standards Mapping - Common Weakness Enumeration Top 25 2020, [5] Standards Mapping - Common Weakness Enumeration Top 25 2021, [6] Standards Mapping - Common Weakness Enumeration Top 25 2022, [7] Standards Mapping - DISA Control Correlation Identifier Version 2, [8] Standards Mapping - General Data Protection Regulation (GDPR), [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 - Security Technical Implementation Guide Version 3.1, [15] Standards Mapping - Security Technical Implementation Guide Version 3.4, [16] Standards Mapping - Security Technical Implementation Guide Version 3.5, [17] Standards Mapping - Security Technical Implementation Guide Version 3.6, [18] Standards Mapping - Security Technical Implementation Guide Version 3.7, [19] Standards Mapping - Security Technical Implementation Guide Version 3.9, [20] Standards Mapping - Security Technical Implementation Guide Version 3.10, [21] Standards Mapping - Security Technical Implementation Guide Version 4.1, [22] Standards Mapping - Security Technical Implementation Guide Version 4.2, [23] Standards Mapping - Security Technical Implementation Guide Version 4.3, [24] Standards Mapping - Security Technical Implementation Guide Version 4.4, [25] Standards Mapping - Security Technical Implementation Guide Version 4.5, [26] Standards Mapping - Security Technical Implementation Guide Version 4.6, [27] Standards Mapping - Security Technical Implementation Guide Version 4.7, [28] Standards Mapping - Security Technical Implementation Guide Version 4.8, [29] Standards Mapping - Security Technical Implementation Guide Version 4.9, [30] Standards Mapping - Security Technical Implementation Guide Version 4.10, [31] Standards Mapping - Security Technical Implementation Guide Version 4.11, [32] Standards Mapping - Security Technical Implementation Guide Version 5.1, [33] Standards Mapping - Web Application Security Consortium 24 + 2, [34] Standards Mapping - Web Application Security Consortium Version 2.00, desc.controlflow.cpp.missing_check_against_null. Whenever we use the "return early" code pattern, Fortify is not able to understand it and raises a "possible null dereference" warning. Address the Null Dereference issues identified by the Fortify scan. So mark them as Not an issue and move on. 2012-09-11. Convert byte[] to String (text data) The below example convert a string to a byte array or byte[] and vice versa. one or more programmer assumptions being violated. 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. 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, . Variant - a weakness A password reset link will be sent to you by email. Only iterating over the list would be fine. This user is already logged in to another session. 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. By using this site, you accept the Terms of Use and Rules of Participation. vegan) just to try it, does this inconvenience the caterers and staff? How do I read / convert an InputStream into a String in Java? 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. Server allows remote attackers to cause a denial of service (crash) via malformed requests that trigger a null dereference. Pillar - a weakness that is the most abstract type of weakness and represents a theme for all class/base/variant weaknesses related to it. To learn more, see our tips on writing great answers. 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. 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

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