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Gray Hat Python by Justin Seitz

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Chapter 8. FUZZING

Fuzzing has been a hot topic for some time, mostly because it's one of the most effective techniques for finding bugs in software. Fuzzing is nothing more than creating malformed or semi-malformed data to send to an application in an attempt to cause faults. We will discuss the different types of fuzzers and the bug classes that represent the faults we are looking for; then we'll create a file fuzzer for our own use. In later chapters, we'll cover the Sulley fuzzing framework and a fuzzer designed to break Windows-based drivers.

First it's important to understand the two basic styles of fuzzers: generation and mutation fuzzers. Generation fuzzers create the data that they are sending to the target, whereas mutation fuzzers take ...

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