E9AFL --- Binary AFL

E9AFL inserts American Fuzzy Lop (AFL) instrumentation into x86_64 Linux binaries. This allows binaries to be fuzzed without the need for recompilation.

E9AFL uses E9Patch to insert the AFL instrumentation via static binary rewriting.

Building

To build E9AFL, simply run the build.sh script:

    $ ./build.sh

Usage

First, install afl-fuzz:

    $ sudo apt-get install afl

To use E9AFL, simply run the command:

    $ ./e9afl /path/to/binary

This will generate an AFL-instrumented binary.afl which can be used with afl-fuzz. See the example below.

Example

To fuzz the binutils readelf program:

    $ ./e9afl readelf
    $ mkdir -p input
    $ mkdir -p output
    $ head -n 1 `which ls` > input/exe
    $ afl-fuzz -m none -i input/ -o output/ -- ./readelf.afl -a @@

If all goes well the output should look something like this:

Troubleshooting

Some instrumented binaries may crash during AFL initialization:

    PROGRAM ABORT : Fork server crashed ...

This is often caused by an insufficient memory limit. See AFL's -m option for more information.

Further Reading

• Xiang Gao, Gregory J. Duck, Abhik Roychoudhury, Scalable Fuzzing of Program Binaries with E9AFL, Automated Software Engineering (ASE), 2021

Bugs

Please report bugs here.

License

GLPv3