Description:

zzuf is a transparent application input fuzzer. Its purpose is to find bugs in
applications by corrupting their user-contributed data (which more than often
comes from untrusted sources on the Internet). It works by intercepting file
and network operations and changing random bits in the program?s input.

zzuf's behaviour is deterministic, making it easier to reproduce bugs. Its
main areas of use are:
quality assurance: use zzuf to test existing software, or integrate it
into your own software?s testsuite
security: very often, segmentation faults or memory corruption issues
mean a potential security hole, zzuf helps exposing some of them

zzuf's primary target is media players, image viewers and web browsers,
because the data they process is inherently insecure, but it was also
successfully used to find bugs in system utilities such as objdump.