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Welcome to the “Binary Exploitation” assignment! This course will be a “Capture the Flag” style project, wherein you will solve some exploits on binary programs. A correct solution will output a ‘flag’ or ‘key’.


There are 11 tasks to complete for 11 total flags. Successful completion of all these flags will result in a 100% Project grade, totaling 14% of your class grade!


You will submit these flags in json format to Gradescope for grading. Detailed directions along with VM download links are included in the writeup below!





This project uses the same VM that has been used for all the other projects



Username: binexp
Password: Mount-Titlis

Go here for project details on the course Github Pages site:


https://github.gatech.edu/pages/cs603...


Head over to Ed Discussion and navigate to the Binary Exploit project for discussions on this project.


Good luck!


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Binary Exploitation


Learning Goals of this project


Students will learn introductory level concepts about binary exploitation. This lab develops understanding of control flow hijacking through different tasks/challenges designed to show certain vulnerabilities or weaknesses in a C program. A python library pwntools will be used to show some exploitation techniques and automation to successfully hack a program


The final deliverables:


A single json formatted file will be submitted to Gradescope. This file should be named project_binexp.json. A template can be found in the Home directory. See Submission Details for more information


Important Reference Material :


– If you’re an absolute beginner with no Linux experience, start with these three links



This Writeup explaining some rudimentary basics of Computer Architecture
This Lecture I’m Developing on how the Stack and Function Calls work in C
This Website (PicoCtf) may be able to help with some more basics from an external source

– Main Course Material References Here:



This Intro to pwntools/pwndbg video showing how to automate some exploits and use our exploit framework on the VM
pwntools Documentation
GDB command cheat sheet

Submission Details


This project is autograded from a single JSON file, see Submission Details page for comprehensive instructions


Virtual Machine


(Note: downloads can be very slow when project first releases due to very high traffic in first few hours/day) This project runs in a Virtual Machine with all the binaries/tools required, and must be used to generate the correct flags. Do not move any files from their original locations, you can install any text editors, debuggers, or anything else you may want to use that aren’t included in the VM



VirtualBox Software (Recommend Latest Version)
(No need to download new VM unless you deleted the VM for the prior tasks!)
VM Download Link
Username: to be announced at project open in Canvas

Rubric


See Rubric Page for extensive breakdown of the points possible for this project


Step 0: IMPORTANT!!


You will need to run a few commands to get the course material, as well as install/update two packages to complete this project.


You can copy and pase this entire block into a terminal or run them one at a time, if you want to do that for some reason:


cd ~/


pip install –upgrade capstone


pip install ropper


wget https://cs6035.s3.amazonaws.com/binex... && chmod 777 binexp.sh && ./binexp.sh





The final command can be re-used at any point in this project and will allow you to re-download a fresh copy of the project material, and make a backup of your existing project_binep.json and ~/binexp/ folder.


Step 1:


Open a terminal and cd into the project directory ~/binexp/00_intro.


$ cd ~/binexp/00_intro


There are a few files in this directory if you type the ls command, detailed below:


e.py – this is a python script that uses the Pwntools library, and will be used to exploit the binary file. Named ‘e’ short for ‘exploit’


flag – this is the COMPILED BINARY that you will target for the various challenges, the e.py file targets this binary with both standard process I/O or GDB depending on which option you provide to the run command


flag.c – this is the SOURCE CODE for the COMPILED BINARY. This is a non-executable te