My Journey into eCXD – eLearnSecurity Certified eXploit Developer

Exploit Developer Student – XDS Course Review

I first want to thank eLearnSecurity for creating such a course on this topic of exploit development. I have always been a big fan of the Windows operating system. For the past few years, I have spent a lot of time on Windows reverse engineering, Windows internals and exploit development on Windows. However, the thing I liked the most about this course is about the diversity they have with both Windows and Linux both x86 and x86_64. I spent quite a good amount of time on learning Linux exploit development and internals and I totally loved to understand those concepts no matter how hard they were to grasp. It is a feeling I cannot explain 😊

I will share my thoughts on each section.

Linux Exploit Development

Module 1: Linux Stack Smashing

As usual, this is the introductory module where you will get a nice understanding of Linux internals and basics of stack-based buffer overflows and identifying them.

The labs included for this module are:

  • Hidden Function
  • Linux Basic Stack Overflow
  • Linux x64 Basic Stack Overflow


Running Shellcode Directly in C

Here’s a cool thing I figured out in position-independent code. I would rephrase the title as running position-independent code instead of shellcode. Check my previous article Executing Shellcode Directly where I used a minimal PE and pointed the AddressofEntryPoint to the beginning of the PIC.

So the goal is to run shellcode in C without any function pointers or any functions at all, not even a main function 🙂 For example, this is all the code. I declare the variable name as “main”. I am using the Microsoft’s Visual C compiler with no parameters.

After compiling it won’t of course run. Why? Well, the initialized data will end up in the “.data” section.