bbfuzzer/README.md

2016 "Breaking Binaries" Fuzzer

This repository hosts the code that we "objEEdump" used to try and render a segfault with multiple binaries during the Cyberstakes 2016 "Breaking Binaries" exercise.

At this point, the code is a disgusting nightmare and is daunting to look through and review, but it should documented and stored nonetheless.

It managed to break over 200 binaries during the exercise, which on average 50-70 more than the other competing teams!

File & Directory Information

• original_smart.py

  This is the main code, the powerhouse Python script that does everything for the fuzzer. This is what the interested onlooker should look at and play with. It was named "smart" because that rendition keeps track of the binaries it has already cracked, and it does not loop through them when it moves onto a new attack. The attacks we tried to implement were a standard input overflow, command-line arguments up to eight repeating, integer bounds, and a theoretical command-line "options" attack, that would try combinations of command-line arguments like -x or -a (etc.) to try and guess at program interaction. This ended up being too time-consuming, so I didn't use it for the actual competition (but I think the functionality is still there).

  The code tests for a segfault by looking for changes in dmesg output. Cheap, I know, but it works.

• this_is_the_old_one.py

  This old rendition of the script did not compartmentalize the attacks into different functions, so it generated the "fuzz" for the [fuzzing] in a much more dirty way (on top of all the code already being pretty overbloated).

• segfaults

  This directory hosts experimental code that was never actually implemented; the hope was try and automate a buffer overflow attack and actually attempt to gain a shell. I ended up testing this with the Behemoth challenge of the Over the Wire wargames, but this made for a "one-trick pony" kind of solution (it was not readily replicable with other vulnerable buffer overflows). An automated buffer overflow would be a worth while thing to implement, if at any point someone wants to try again.

• clean.sh

  This was a dirty bash script to kill any leftover processes and binaries that still happened to be running after execution.