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Fuzz testing with zzuf

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HowTos

Fuzz testing, which uses random input to test software for bugs, has been the biggest thing to happen in IT security in quite awhile. Now you can quickly and easily direct your own fuzz testing ops, thanks to a cool little program called zzuf.

We can thank stupid users for the fuzz testing craze -- users who enter dates where dollar amounts are supposed to go, or digits where their names belong, or a ZIP code where a Social Security number is expected. Their lameness often results in instant breakage -- segfaults, overruns, all manner of crashes. And some of those crashes are perfect for exploiting, allowing black hats to gain access to systems or data -- like the Wi-Fi vulnerabilities that were almost disclosed at BlackHat about this time last year, for example, which were discovered by fuzz testing the Wi-Fi drivers with unexpected data.

Fuzz testing throws anything and everything, and sometimes nothing at all, at applications expecting data of a certain size, shape, or format. Many programs are more stable and secure today because of the hidden flaws found with fuzz testing.

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