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fuzz testing == fuzzing

Fuzzing. fuzz testing == fuzzing. “ The original work was inspired by being logged on to a modem during a storm with lots of line noise. And the line noise was generating junk characters that seemingly were causing programs to crash. The noise suggested the term ‘ fuzz ’ . ”

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fuzz testing == fuzzing

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  1. Fuzzing fuzz testing == fuzzing “The original work was inspired by being logged on to a modem during a storm with lots of line noise. And the line noise was generating junk characters that seemingly were causing programs to crash. The noise suggested the term ‘fuzz’.” --Barton Miller

  2. Fuzzing Defn (IEEE Standard Glossary of Software Engineering Terminology) “The degree to which a system or component can function correctly in the presence of invalid inputs or stressful environmental conditions.” The basic idea fuzzer

  3. Fuzz What to Complex data formats image, sound, video, etc. files object code / bytecode Protocols network protocols (TCP/IP, http, key exchange, SSL, etc.) database (SQL) User-provided files

  4. The basis of fuzzing… test cases Two Types of Fuzzers Mutation Fuzzers the “dumb” fuzzers Generative Fuzzers intelligence comes with a price…

  5. Why Fuzz?

  6. Mutation Fuzzers What does the fuzzer do? bit flipping Mutated Test Case(s) User remove bit segments insert bit segments fuzzer sometimes uses heuristics Example: ______

  7. Generative Fuzzers What does the user specify? data model Mutated Test Case(s) User state model fuzzer Example: ________ fuzzer Downside – complex to use

  8. The Good, the Bad, & the Ugly Test the unusual Large number of test cases Complexity of input difficult to capture Tedious configuration Correctness?

  9. Some “Fuzzy” Links zzuf Fuzzer http://caca.zoy.org/wiki/zzuf Peach Fuzzer http://peachfuzzer.com Jester http://jester.sourceforge.net Taof (the art of fuzz testing) http://sourceforge.net/projects/taof

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