Release version: 4.10c
GitHub version: 4.10c
Repository: https://github.com/AFLplusplus/AFLplusplus
AFL++ is maintained by:
Originally developed by Michal “lcamtuf” Zalewski.
AFL++ is a superior fork to Google's AFL - more speed, more and better mutations, more and better instrumentation, custom module support, etc.
You are free to copy, modify, and distribute AFL++ with attribution under the terms of the Apache-2.0 License. See the LICENSE for details.
Here is some information to get you started:
stable or dev - depending on your risk appetite. Also take a look at the list of important changes in AFL++ and the list of features.aflplusplus setup, or use afl-clang-fast with AFL_LLVM_CMPLOG=1. You can find the aflplusplus default configuration on Google's fuzzbench.To have AFL++ easily available with everything compiled, pull the image directly from the Docker Hub (available for both x86_64 and arm64):
docker pull aflplusplus/aflplusplus docker run -ti -v /location/of/your/target:/src aflplusplus/aflplusplus
This image is automatically published when a push to the stable branch happens (see branches). If you use the command above, you will find your target source code in /src in the container.
Note: you can also pull aflplusplus/aflplusplus:dev which is the most current development state of AFL++.
To build AFL++ yourself - which we recommend - continue at docs/INSTALL.md.
NOTE: Before you start, please read about the common sense risks of fuzzing.
This is a quick start for fuzzing targets with the source code available. To read about the process in detail, see docs/fuzzing_in_depth.md.
To learn about fuzzing other targets, see:
Step-by-step quick start:
Compile the program or library to be fuzzed using afl-cc. A common way to do this would be:
CC=/path/to/afl-cc CXX=/path/to/afl-c++ ./configure --disable-shared make clean all
Get a small but valid input file that makes sense to the program. When fuzzing verbose syntax (SQL, HTTP, etc.), create a dictionary as described in dictionaries/README.md, too.
If the program reads from stdin, run afl-fuzz like so:
./afl-fuzz -i seeds_dir -o output_dir -- \ /path/to/tested/program [...program's cmdline...]
To add a dictionary, add -x /path/to/dictionary.txt to afl-fuzz.
If the program takes input from a file, you can put @@ in the program's command line; AFL++ will put an auto-generated file name in there for you.
Investigate anything shown in red in the fuzzer UI by promptly consulting docs/afl-fuzz_approach.md#understanding-the-status-screen.
You will find found crashes and hangs in the subdirectories crashes/ and hangs/ in the -o output_dir directory. You can replay the crashes by feeding them to the target, e.g. if your target is using stdin:
cat output_dir/crashes/id:000000,* | /path/to/tested/program [...program's cmdline...]
You can generate cores or use gdb directly to follow up the crashes.
We cannot stress this enough - if you want to fuzz effectively, read the docs/fuzzing_in_depth.md document!
Questions? Concerns? Bug reports?
The following branches exist:
We have several ideas we would like to see in AFL++ to make it even better. However, we already work on so many things that we do not have the time for all the big ideas.
This can be your way to support and contribute to AFL++ - extend it to do something cool.
For everyone who wants to contribute (and send pull requests), please read our contributing guidelines before you submit.
Many of the improvements to the original AFL and AFL++ wouldn't be possible without feedback, bug reports, or patches from our contributors.
Thank you! (For people sending pull requests - please add yourself to this list :-)
Jann Horn Hanno Boeck Felix Groebert Jakub Wilk Richard W. M. Jones Alexander Cherepanov Tom Ritter Hovik Manucharyan Sebastian Roschke Eberhard Mattes Padraig Brady Ben Laurie @dronesec Luca Barbato Tobias Ospelt Thomas Jarosch Martin Carpenter Mudge Zatko Joe Zbiciak Ryan Govostes Michael Rash William Robinet Jonathan Gray Filipe Cabecinhas Nico Weber Jodie Cunningham Andrew Griffiths Parker Thompson Jonathan Neuschaefer Tyler Nighswander Ben Nagy Samir Aguiar Aidan Thornton Aleksandar Nikolich Sam Hakim Laszlo Szekeres David A. Wheeler Turo Lamminen Andreas Stieger Richard Godbee Louis Dassy teor2345 Alex Moneger Dmitry Vyukov Keegan McAllister Kostya Serebryany Richo Healey Martijn Bogaard rc0r Jonathan Foote Christian Holler Dominique Pelle Jacek Wielemborek Leo Barnes Jeremy Barnes Jeff Trull Guillaume Endignoux ilovezfs Daniel Godas-Lopez Franjo Ivancic Austin Seipp Daniel Komaromy Daniel Binderman Jonathan Metzman Vegard Nossum Jan Kneschke Kurt Roeckx Marcel Boehme Van-Thuan Pham Abhik Roychoudhury Joshua J. Drake Toby Hutton Rene Freingruber Sergey Davidoff Sami Liedes Craig Young Andrzej Jackowski Daniel Hodson Nathan Voss Dominik Maier Andrea Biondo Vincent Le Garrec Khaled Yakdan Kuang-che Wu Josephine Calliotte Konrad Welc Thomas Rooijakkers David Carlier Ruben ten Hove Joey Jiao fuzzah @intrigus-lgtm Yaakov Saxon Sergej Schumilo
If you use AFL++ in scientific work, consider citing our paper presented at WOOT'20:
Andrea Fioraldi, Dominik Maier, Heiko Eißfeldt, and Marc Heuse. “AFL++: Combining incremental steps of fuzzing research”. In 14th USENIX Workshop on Offensive Technologies (WOOT 20). USENIX Association, Aug. 2020.
@inproceedings {AFLplusplus-Woot20, author = {Andrea Fioraldi and Dominik Maier and Heiko Ei{\ss}feldt and Marc Heuse}, title = {{AFL++}: Combining Incremental Steps of Fuzzing Research}, booktitle = {14th {USENIX} Workshop on Offensive Technologies ({WOOT} 20)}, year = {2020}, publisher = {{USENIX} Association}, month = aug, }