Note: Hacking is not a joke so please keep patience and learn it step by step.
If you have read all our previous posts , you will be ready to exploits the system . So after cover all basics and necessary things it’s time to moving towards exploits. Lets start from Buffer-code overflows .
There is a basic question that what can buffer-overflow do in exploit , so lets see the power of buffer overflows here.
So if you are ready to moving towards exploit ,lets start:
What are Buffers ?
Buffers are basically use to store data in memory. While we are moving towards buffers we are basically interested in special types of buffers , buffers that can store strings or say that can hold strings.
Problems with buffers
There is a basic problem with bufffers that the itself have no mechanism to handle exception i.e, putting to much data into the reserve place.
Lets see an Example:
Try to copy 25 characters in a character type array of size
Look at the code:
int main(int argc, char *argv)
What just happens?
Output : segmentation fault
Look at the screenshot below
This is we did to crash whatsapp , we just passes a large string of special characters which it can’t handle and just start crashing repeatedly .
But it’s not the end of our exploit tutorial even it’s only the starting. As I said before “Hacking is not a joke so please keep patience and learn it step by step.” So please stick with us , in our next post we will show you by debugging it, and will tell you how to find it’s eip or rip(instruction pointer ,which will help us to make a jump for next instruction).