Buffer Overflow Example

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

#define MAX_WORD_LENGTH 5

int main(int argc, char *argv[])
{
  char password[5];
  int authenticate = 0;
  
  printf("Enter a word (<%d chars): ", MAX_WORD_LENGTH);
  fflush(stdout);
  scanf("%s", password); /* DANGER: vulnerable to buffer overflow*/

  if(strcmp(password, "correct") == 0)
    authenticate = 1;

  if(authenticate)
    printf("You are authorized");
}