american fuzzy lop – Security Oriented Fuzzing Tool

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American fuzzy lop is a security-oriented fuzzing tool that employs a novel type of compile-time instrumentation and genetic algorithms to automatically discover clean, interesting test cases that trigger new internal states in the targeted binary. This substantially improves the functional coverage for the fuzzed code. The compact synthesized corpora produced by the tool are also useful for seeding other, more labour or resource-intensive testing regimes down the road.

american fuzzy lop - Security Oriented Fuzzing Tool

Compared to other instrumented fuzzers, afl-fuzz is designed to be practical: it has modest performance overhead, uses a variety of highly effective fuzzing strategies and effort minimization tricks, requires essentially no configuration, and seamlessly handles complex, real-world use cases – say, common image parsing or file compression libraries.

So, What’s Good?

In a hurry? There are several fairly decent reasons to give afl-fuzz a try:

  • It is pretty sophisticated. It’s an instrumentation-guided genetic fuzzer capable of synthesizing complex file semantics in a wide range of non-trivial targets, lessening the need for purpose-built, syntax-aware tools. It also comes with a unique crash explorer and a test case minimizer to make it dead simple to analyze and evaluate the impact of crashing bugs.
  • It has street smarts. It is built around a range of carefully researched, high-gain test case preprocessing and fuzzing strategies rarely employed with comparable rigor in other fuzzing frameworks. As a result, it finds real bugs.
  • It is fast. Thanks to its low-level compile-time or binary-only instrumentation and other optimizations, the tool offers near-native or better-than-native fuzzing speeds against common real-world targets. The newly-added persistent mode allows for exceptionally fast fuzzing of many programs with the help of minimal code modifications, too.
  • It’s rock solid. Compared to other instrumentation- or solver-based fuzzers, it has remarkably few gotchas and failure modes. It also comes with robust, user-friendly problem detection that guides you through any potential hiccups.
  • No tinkering required. In contrast to most other fuzzers, the tool requires essentially no guesswork or fine-tuning. Even if you wanted to, you will find virtually no knobs to fiddle with and no “fuzzing ratios” to dial in.
  • It’s chainable to other tools. The fuzzer generates superior, compact test corpora that can serve as a seed for more specialized, slower, or labor-intensive processes and testing frameworks.
  • It sports a hip, retro-style UI. Just scroll back to the top of the page. Enough said.

You can dowload afl here:

afl-latest.tgz

Or read more here.

Posted in: Hacking Tools, Secure Coding

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