zzuf

I recently tested a unique application input fuzzer called zzuf, and I must admit, I was intrigued by its purpose. The main focus of zzuf is to uncover bugs in applications by corrupting their user-contributed data, which often comes from untrusted sources on the Internet. The software does this by intercepting file and network operations and changing random bits in the program's input.

One key feature of zzuf is its deterministic behavior, which makes it easier to reproduce bugs. The primary areas of use for zzuf are quality assurance and security. Users can use zzuf to test existing software or integrate it into their own software's testsuite. In terms of security, zzuf is often successful in exposing potential security holes, such as segmentation faults or memory corruption issues.

Media players, image viewers, and web browsers are the primary targets for zzuf. These applications process inherently insecure data, making them ideal candidates for testing with zzuf. Interestingly, the software has also been successful in uncovering bugs in system utilities like objdump.

Overall, I found zzuf to be an innovative and helpful tool for testing and ensuring quality in software development. Additionally, the recent release includes bug fixes, including a crash with library initialization functions that use realloc() before the libc is ready.