🔐 Buffer Overflow Exploit – Exercise 1

This repository contains the solution for Exercise 1 – Buffer Overflow from the Cybersecurity Lab (67607) at the Hebrew University.

---

📚 Overview

The objective of this exercise is to exploit a stack-based buffer overflow vulnerability in a remote C server.
The crafted payload overflows the buffer, overwrites the return address, and injects custom shellcode that executes the script /tmp/success_script with the submitter's ID.

---

🛠️ Files Included

File	Description
ex1.c	Main C program – crafts and sends the buffer overflow payload
shellcode.s	Assembly source for the injected shellcode
explanation.txt	Detailed explanation of the payload and assembly logic
readme.txt	Submitter IDs in the format id1,id2
.gitignore	Ignores .zip, .vmdk, PDFs, and other irrelevant files

---

🚀 How to Run

1. Compile the attacker code inside the client container:

   gcc -Wall -Wextra -Werror ex1.c -o attacker