Welcome everyone to 2012! I took a bit of a break during these holidays, and am just starting to get back going.

This challenge was very interesting to me. I figured it would build off of the previous one. However, it was its own standalone challenge.

We are given the following code to the stack7 …

The Stack6 challenge was definitely a learning experience for me. This actually went beyond my existing skills, and made me learn some new stuff.

We are given the following code.

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

void …

Wow, this challenge was a tough one for me. I ran into some huge problems that I had to work out. Considering this is a “standard buffer overflow”, I figured it’d be as easy as some of the others I’ve done in the past. I’ll explain my frustrations inline.

First, …

With this challenge, I think things really start to get fun, and more real-world.

We are provided with the following C program:

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

void win()
{
 printf("code flow successfully changed\n");
} …

This challenge starts getting a little bit more involved than the previous ones. Instead of just providing a new value for the “modified” variable, we need to make the code jump to a method, changing the execution.

#include <stdlib.h>
#include <unistd.h>
#include …

This challenge is pretty much the same as the previous challenge, except that the buffer comes from an environmental variable.

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int main(int argc, char **argv)
{
 volatile int modified;
 char …