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What is Sulley?

Sulley serves as a robust fuzz testing framework and engine that integrates a variety of extensible components. In my opinion, it exceeds the capabilities of most prior fuzzing tools, whether they are commercially available or open-source. The framework is intended to simplify not just the representation of data, but also how it is transmitted and instrumented. As a fully automated fuzzing solution crafted entirely in Python, Sulley functions independently of human oversight. Alongside its remarkable data generation abilities, Sulley boasts numerous essential features typical of a modern fuzzer. It diligently monitors network activity while maintaining comprehensive logs for in-depth analysis. Moreover, Sulley is designed to instrument and assess the stability of the target system, with the ability to restore it to a stable condition using various methods when necessary. It proficiently identifies, tracks, and categorizes any issues that occur during testing. Furthermore, Sulley can execute fuzzing tasks concurrently, significantly increasing the speed of the testing process. It also has the capability to autonomously discover unique sequences of test cases that trigger faults, which enhances the overall efficiency of the testing procedure. Additionally, Sulley’s extensive feature set makes it an invaluable asset for security testing and vulnerability assessment. Its continual evolution ensures that it remains at the forefront of fuzz testing technology.

What is Atheris?

Atheris operates as a fuzzing engine tailored for Python, specifically employing a coverage-guided approach, and it extends its functionality to accommodate native extensions built for CPython. Leveraging libFuzzer as its underlying framework, Atheris proves particularly adept at uncovering additional bugs within native code during fuzzing processes. It is compatible with both 32-bit and 64-bit Linux platforms, as well as Mac OS X, and supports Python versions from 3.6 to 3.10. While Atheris integrates libFuzzer, which makes it well-suited for fuzzing Python applications, users focusing on native extensions might need to compile the tool from its source code to align the libFuzzer version included with Atheris with their installed Clang version. Given that Atheris relies on libFuzzer, which is bundled with Clang, users operating on Apple Clang must install an alternative version of LLVM, as the standard version does not come with libFuzzer. Atheris utilizes a coverage-guided, mutation-based fuzzing strategy, which streamlines the configuration process, eliminating the need for a grammar definition for input generation. However, this approach can lead to complications when generating inputs for code that manages complex data structures. Therefore, users must carefully consider the trade-offs between the simplicity of setup and the challenges associated with handling intricate input types, as these factors can significantly influence the effectiveness of their fuzzing efforts. Ultimately, the decision to use Atheris will hinge on the specific requirements and complexities of the project at hand.

Media

Media

Integrations Supported

Python

Integrations Supported

Python
Google OSS-Fuzz
LibFuzzer

API Availability

API Availability

Has API

Pricing Information

Free
Free Version

Pricing Information

Free
Free Version

Supported Platforms

Windows
Mac
Linux

Supported Platforms

Mac
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

OpenRCE

Company Website

github.com/OpenRCE/sulley

Company Facts

Organization Name

Google

Company Website

github.com/google/atheris

Categories and Features

Fuzz Testing

Not specified

Categories and Features

Fuzz Testing

Not specified

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