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kleefl's Introduction

KleeFL - Seeding Fuzzers With Symbolic Execution

HowTo ...

Prepare dependencies or simply grab the provisioned vagrant box

http://bit.ly/download_kleefl_box

Setup a project structure like this:

mkdir project_xyz
cd project_xyz
python /vagrant/tools/kleefl_init

Select your source code, e.g.:

cp -r /vagrant/example source

Build source using wllvm & afl-clang

cd source
python /vagrant/tools/kleefl_build make

Run klee symbolic execution, using the default setup

./klee/run_klee

Prepare klee's findings for afl-fuzz

python /vagrant/tools/kleefl_prepare_fuzzing

Finally: Fuzz, fuzz, fuzz!

./fuzz/run_afl.sh

Analyze findings

./kleefl_crash_inspector fuzz/out
(fuzz/out is the afl sync dir, report saved by default in vagrant shared dir /vagrant/crash_report/)

Analyze coverage & generate report

python kleefl_cov_inspector {make, binary fuzz/sync_dir}
zcov genhtml coverage.zcov cov_report

Further details can found in the project report or check out our beautiful USENIX poster

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