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What is OWASP WSFuzzer?

Fuzz testing, often simply called fuzzing, is a method in software evaluation focused on identifying implementation flaws by automatically introducing malformed or partially malformed data. Imagine a scenario where a program uses an integer variable to record a user's choice among three questions, represented by the integers 0, 1, or 2, which results in three different outcomes. Given that integers are generally maintained as fixed-size variables, the lack of secure implementation in the default switch case can result in program failures and a range of conventional security risks. Fuzzing acts as an automated approach to reveal such software implementation flaws, facilitating the detection of bugs during their occurrence. A fuzzer is a dedicated tool that automatically injects semi-randomized data into the program's execution path, helping to uncover irregularities. The data generation process relies on generators, while the discovery of vulnerabilities frequently utilizes debugging tools capable of examining the program’s response to the inserted data. These generators usually incorporate a combination of tried-and-true static fuzzing vectors to improve the testing process, ultimately fostering more resilient software development methodologies. Additionally, by systematically applying fuzzing techniques, developers can significantly enhance the overall security posture of their applications.

What is LibFuzzer?

LibFuzzer is an in-process engine that employs coverage-guided techniques for evolutionary fuzzing. By integrating directly with the library being tested, it injects generated fuzzed inputs into a specific entry point or target function, allowing it to track executed code paths while modifying the input data to improve code coverage. The coverage information is gathered through LLVM’s SanitizerCoverage instrumentation, which provides users with comprehensive insights into the testing process. Importantly, LibFuzzer is continuously maintained, with critical bugs being resolved as they are identified. To use LibFuzzer with a particular library, the first step is to develop a fuzz target; this function takes a byte array and interacts meaningfully with the API under scrutiny. Notably, this fuzz target functions independently of LibFuzzer, making it compatible with other fuzzing tools like AFL or Radamsa, which adds flexibility to testing approaches. Moreover, combining various fuzzing engines can yield more thorough testing results and deeper understanding of the library's security flaws, ultimately enhancing the overall quality of the code. The ongoing evolution of fuzzing techniques ensures that developers are better equipped to identify and address potential vulnerabilities effectively.

Media

Media

Integrations Supported

Atheris
C
C++
CI Fuzz
ClusterFuzz
Fuzzbuzz
Google ClusterFuzz
Jazzer

Integrations Supported

Atheris
C
C++
CI Fuzz
ClusterFuzz
Fuzzbuzz
Google ClusterFuzz
Jazzer

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free
Free Trial Offered?
Free Version

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

OWASP

Company Location

United States

Company Website

owasp.org/www-community/Fuzzing

Company Facts

Organization Name

LLVM Project

Date Founded

2003

Company Website

llvm.org/docs/LibFuzzer.html

Categories and Features

Categories and Features

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