Intro

What

This project aims to guide security researchers along the journey of squeezing out as much capability of AFL++ as possible for any engagement where fuzzing is desired.

Why

To paraphrase what a wise meme on the Internet once said...

How

This project accomplishes this goal by:

• Leveraging a good balance of AFL++'s advanced capbilities, including those that further advance AFL++'s advanced capbilities :) Examples include:
  • Preeny
  • LibFuzzer
  • HonggFuzz
  • Radamsa
  • Address Sanitizer
  • And Much More...Checkout instrumentation_globals.sh && init_aflplusplus_container.sh for more details.
• Providing guidance around instrumenting binaries with AFL++ "Persistence Mode" with functions such as __AFL_FUZZ_INIT(), __AFL_INIT(), && __AFL_LOOP()
• Supports the ability to spin up a "main" fuzzer with multiple "secondaries"
• Enabling the Creation of test cases for a given target
• Cranking out as many mutations / second as possible
• Aiding researchers in discovering .so files loaded via dlopen (which can be appended to AFL_PRELOAD at runtime)

Installation / Usage

1. Clone the repo:

$ cd /opt
$ sudo git clone https://github.com/0dayInc/container.aflplusplus.template
$ sudo chown -R $USER:$USER container.aflplusplus.template

2. Review Usage:

$ cd container.aflplusplus.template
$ ./AFLplusplus_template.sh -h
USAGE:
./AFLplusplus_template.sh
    -h                     # Display USAGE

    -T <TARGET CMD/FLAGS>  # REQUIRED
                           # TARGET CMD / FLAGS of the target binary
                           # to be fuzzed. It must reside in the
                           # TARGET prefix (i.e. /fuzz_session/TARGET)

    -m <main || secondary> # REQUIRED
                           # afl++ Mode 

    -r <src dir name>      # REQUIRED
                           # Name of the source code folder
                           # residing in ./TARGET_SRC to build

    -P                     # OPTIONAL / main MODE ONLY
                           # Preload target specific, colon delimited
                           # list of .so files to append to AFL_PRELOAD

    -c                     # OPTIONAL / main MODE ONLY
                           # Nuke contents of TARGET prefix
                           # (i.e. /fuzz_session/TARGET)
                           # which is tmpfs and LOST AFTER REBOOT
                           # OF HOST OS

    -n                     # OPTIONAL / main MODE ONLY
                           # Nuke contents of multi-sync (New afl++ Session)
                           # (i.e. /fuzz_session/AFLplusplus/multi_sync)
                           # which is tmpfs and LOST AFTER REBOOT
                           # OF HOST OS

    -t                     # OPTIONAL / main MODE ONLY
                           # Nuke contents of input (afl++ Test Cases)
                           # (i.e. /fuzz_session/AFLplusplus/input)
                           # which is tmpfs and LOST AFTER REBOOT
                           # OF HOST OS

    -D                     # OPTIONAL
                           # Enable Debugging

3. Clone the Target Source Code Repo:

$ cd TARGET_SRC
$ git clone <TARGET_GIT_REPO>

4. Instrument your target function(s) w/ __AFL_INIT &&__AFL_LOOP:

$ vi <TARGET_GIT_REPO>/<TARGET_SRC_FILE_TO_INSTRUMENT_W __AFL_INIT && __AFL_LOOP>

5. Sanity check instrumentation_globals.sh && build_target.sh scripts

$ cd ..
$ vi TARGET/instrumentation_globals.sh
$ vi TARGET/build_target.sh

6. Add your own test cases as single files in the ./TARGET/test_cases directory. From there, they'll be copied into /fuzz_session/AFLplusplus/input once fuzzing begins.

7. Begin Fuzzing (Example Usage):

$ tmux new -s afl_main
$ ./AFLplusplus_template.sh \
  -m main \
  -r <src_folder_name> \
  -T "target_bin --flags"

8. add another CPU core into the fuzzing mix:

$ tmux new -s afl_sec1
$ ./AFLplusplus_template.sh \
  -m secondary \
  -r <src_folder_name> \
  -T "target_bin --flags"

Happy Fuzzing!

Keep Us Caffeinated

If you've found this project useful and you're interested in supporting our efforts, we invite you to take a brief moment to keep us caffeinated:

0x004D65726368