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转几篇关于DoS攻击的文章

September 11th, 2007 Posted in Linux

已经有很多介绍DOS(Denial of Service,即拒绝服务)攻击的文章,但是,多数人还是不知道DOS到底是什么,它到底是怎么实现的。本文主要介绍DOS的机理和常见的实施方法。因 前段时间仔细了解了TCP/IP协议以及RFC文档,有点心得。同时,文中有部分内容参考了Shaft的文章翻译而得。要想了解DOS攻击得实现机理,必 须对TCP有一定的了解。

1、什么是DOS攻击
DOS:即Denial Of Service,拒绝服务的缩写,可不能认为是微软的dos操作系统了。好象在5·1的时候闹过这样的笑话。拒绝服务,就相当于必胜客在客满的时候不再让 人进去一样,呵呵,你想吃馅饼,就必须在门口等吧。DOS攻击即让目标机器停止提供服务或资源访问。

2、有关TCP协议的东西
TCP(transmission control protocol,传输控制协议),是用来在不可靠的因特网上提供可靠的、端到端的字节流通讯协议,在RFC793中有正式定义,还有一些解决错误的东西 在RFC 1122中有记录,RFC 1323则有TCP的功能扩展。我们常见到的TCP/IP协议中,IP层不保证将数据报正确传送到目的地,TCP则从本地机器接受用户的数据流,将其分成 不超过64K字节的数据片段,将每个数据片段作为单独的IP数据包发送出去,最后在目的地机器中再组合成完整的字节流,TCP协议必须保证可靠性。发送和 接收方的TCP传输以数据段的形式交换数据,一个数据段包括一个固定的20字节,加上可选部分,后面再跟上数据,TCP协议从发送方传送一个数据段的时 候,还要启动计时器,当数据段到达目的地后,接收方还要发送回一个数据段,其中有一个确认序号,它等于希望收到的下一个数据段的顺序号,如果计时器在确认 信息到达前超时了,发送方会重新发送这个数据段。

上面,我们总体上了解一点TCP协议,重要的是要熟悉TCP的数据头(header)。因为数据流的传输最重要的就是header里面的东西,至于发送的 数据,只是header附带上的。客户端和服务端的服务响应就是同header里面的数据相关,两端的信息交流和交换是根据header中的内容实施的, 因此,要实现DOS,就必须对header中的内容非常熟悉。

下面是TCP数据段头格式。RFC793中的
(请大家注意网页显示空格使下面的格式错位了)

0     1     2     3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Source Port   |  Destination Port  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|      Sequence Number      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Acknowledgment Number      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Data |   |U|A|P|R|S|F|        |
| Offset| Reserved |R|C|S|S|Y|I|   Window    |
|  |   |G|K|H|T|N|N|        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|   Checksum   |   Urgent Pointer  |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Options     | Padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|        data        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

TCP Header Format

Source Port和 Destination Port :是本地端口和目标端口
Sequence Number 和 Acknowledgment Number :是顺序号和确认号,确认号是希望接收的字节号。这都是32位的,在TCP流中,每个数据字节都被编号。
Data offset :表明TCP头包含多少个32位字,用来确定头的长度,因为头中可选字段长度是不定的。
Reserved : 保留的6位,现在没用,都是0

接下来是6个1位的标志,这是两个计算机数据交流的信息标志。接收和发送断根据这些标志来确定信息流的种类。下面是一些介绍:
URG:(Urgent Pointer field significant)紧急指针。用到的时候值为1,用来处理避免TCP数据流中断
ACK:(Acknowledgment field significant)置1时表示确认号(Acknowledgment Number)为合法,为0的时候表示数据段不包含确认信息,确认号被忽略。
PSH:(Push Function),PUSH标志的数据,置1时请求的数据段在接收方得到后就可直接送到应用程序,而不必等到缓冲区满时才传送。
RST:(Reset the connection)用于复位因某种原因引起出现的错误连接,也用来拒绝非法数据和请求。如果接收到RST位时候,通常发生了某些错误。
SYN:(Synchronize sequence numbers)用来建立连接,在连接请求中,SYN=1,ACK=0,连接响应时,SYN=1,ACK=1。即,SYN和ACK来区分 Connection Request和Connection Accepted。
FIN:(No more data from sender)用来释放连接,表明发送方已经没有数据发送了。

知道这重要的6个指示标志后,我们继续来。

16位的WINDOW字段:表示确认了字节后还可以发送多少字节。可以为0,表示已经收到包括确认号减1(即已发送所有数据)在内的所有数据段。
接下来是16位的Checksum字段,用来确保可靠性的。
16位的Urgent Pointer,和下面的字段我们这里不解释了。不然太多了。呵呵,偷懒啊。

我们进入比较重要的一部分:TCP连接握手过程。这个过程简单地分为三步。

在没有连接中,接受方(我们针对服务器),服务器处于LISTEN状态,等待其他机器发送连接请求。

第一步:客户端发送一个带SYN位的请求,向服务器表示需要连接,比如发送包假设请求序号为10,那么则为:SYN=10,ACK=0,然后等待服务器的响应。

第二步:服务器接收到这样的请求后,查看是否在LISTEN的是指定的端口,不然,就发送RST=1应答,拒绝建立连接。如果接收连接,那么服务 器发送确认,SYN为服务器的一个内码,假设为100,ACK位则是客户端的请求序号加1,本例中发送的数据是:SYN=100,ACK=11,用这样的 数据发送给客户端。向客户端表示,服务器连接已经准备好了,等待客户端的确认
这时客户端接收到消息后,分析得到的信息,准备发送确认连接信号到服务器
第三步:客户端发送确认建立连接的消息给服务器。确认信息的SYN位是服务器发送的ACK位,ACK位是服务器发送的SYN位加1。即:SYN=11,ACK=101。

这时,连接已经建立起来了。然后发送数据,<SYN=11,ACK=101><DATA>。这是一个基本的请求和连接过程。需要注意的是这些标志位的关系,比如SYN、ACK。

3、服务器的缓冲区队列(Backlog Queue)
服务器不会在每次接收到SYN请求就立刻同客户端建立连接,而是为连接请求分配内存空间,建立会话,并放到一个等待队列中。如果,这个等待的队列已经满了,那么,服务器就不在为新的连接分配任何东西,直接丢弃新的请求。如果到了这样的地步,服务器就是拒绝服务了。
如果服务器接收到一个RST位信息,那么就认为这是一个有错误的数据段,会根据客户端IP,把这样的连接在缓冲区队列中清除掉。这对IP欺骗有影响,也能被利用来做DOS攻击。

上面的介绍,我们了解TCP协议,以及连接过程。要对SERVER实施拒绝服务攻击,实质上的方式就是有两个:
一, 迫使服务器的缓冲区满,不接收新的请求。
二, 使用IP欺骗,迫使服务器把合法用户的连接复位,影响合法用户的连接这就是DOS攻击实施的基本思想。具体实现有这样的方法:

1、SYN FLOOD
利用服务器的连接缓冲区(Backlog Queue),利用特殊的程序,设置TCP的Header,向服务器端不断地成倍发送只有SYN标志的TCP连接请求。当服务器接收的时候,都认为是没有建立起来的连接请求,于是为这些请求建立会话,排到缓冲区队列中。
如果你的SYN请求超过了服务器能容纳的限度,缓冲区队列满,那么服务器就不再接收新的请求了。其他合法用户的连接都被拒绝掉。可以持续你的SYN请求发送,直到缓冲区中都是你的只有SYN标记的请求。现在有很多实施SYN FLOOD的工具,呵呵,自己找去吧。

2、IP欺骗DOS攻击
这种攻击利用RST位来实现。假设现在有一个合法用户(1.1.1.1)已经同服务器建立了正常的连接,攻击者构造攻击的TCP数据,伪装自己的IP为 1.1.1.1,并向服务器发送一个带有RST位的TCP数据段。服务器接收到这样的数据后,认为从1.1.1.1发送的连接有错误,就会清空缓冲区中建 立好的连接。这时,如果合法用户1.1.1.1再发送合法数据,服务器就已经没有这样的连接了,该用户就必须从新开始建立连接。
攻击时,伪造大量的IP地址,向目标发送RST数据,使服务器不对合法用户服务。

3、带宽DOS攻击
如果你的连接带宽足够大而服务器又不是很大,你可以发送请求,来消耗服务器的缓冲区消耗服务器的带宽。这种攻击就是人多力量大了,配合上SYN一起实施DOS,威力巨大。不过是初级DOS攻击。呵呵。Ping白宫??你发疯了啊!

4、自身消耗的DOS攻击
这是一种老式的攻击手法。说老式,是因为老式的系统有这样的自身BUG。比如Win95 (winsock v1), Cisco IOS v.10.x, 和其他过时的系统。
这种DOS攻击就是把请求客户端IP和端口弄成主机的IP端口相同,发送给主机。使得主机给自己发送TCP请求和连接。这种主机的漏洞会很快把资源消耗光。直接导致当机。这种伪装对一些身份认证系统还是威胁巨大的。

实施DOS攻击最主要的就是构造需要的TCP数据,充分利用TCP协议。这些攻击方法都是建立在TCP基础上的。当然还有更多的实施方法,可以自己去研究。

本文只是一种技术讨论,不存在任何恶意。如果有人利用做过什么坏事情,同本人无关。

预防DoS攻击
我记得上大学时我最喜欢的恶作剧是在门与门框之间的缝隙中塞上几枚硬币,将锁着的锁舌顶在门框上。这样真正的住户就拧不动钥匙,这种把戏似乎非常有趣,直到有一天发生在我身上为止。这就是一种原始形式的拒绝服务。

当然,在企业环境中,DoS(拒绝服务)具有更大的危险性。今天,DoS攻击是困扰IT经理和管理人员,尤其是困扰那些负责对于企业战略取得成功至关重要站点的人员。

一些辩护者一直试图原谅DoS制造者的行为,将这类攻击与儿童无知的恶作剧(如乱按门铃或乱打电话)等同起来。不同之处在于我可以选择不去理睬门铃或电话 (我经常这样做)。Internet服务器却没有选择,它只能对网络查询做出响应,而它的不可用性对一家公司来说意味着死亡。

由于你通常不知道敌人是谁,并且常常不知道你的系统会受到多大损害,因此DoS攻击令人感到恐惧。因此,制定防御DoS的策略尤其重要,这个战略既要考虑内部的威胁,也要考虑外部的威胁。

了解攻击者

当然,不是所有的DoS问题都是攻击造成的。一些事故在像Internet这样的非集中式环境中(在这种环境中,一个损坏了的路由表会在几分钟内造成一场灾难)是难避免的。

内部网络面临着类似的问题,尽管精心设计的企业网络可以对数据流进行区分,使问题可以很容易地被孤立出来。但是,实际的攻击既可以来自企业内又可以来自企业外。尽管本文的讨论集中在外部的攻击上,但是,任何减轻DoS事件后果的计划也同样应当考虑到内部威胁的可能性。

不过,虽然存在来自内部的攻击,但是对于使用Internet的公司,安全的最大威胁仍是青少年的恶作剧行为。真正不幸的事情是,今天有许多工具使用户可以从家中就发动攻击,因此DoS的问题可能会越来越严重而不是有所好转。

DoS基础知识

DoS攻击包括很多不同的方式。在这些方式中,三种最流行的方式为使服务失效、独占或盗用资源以及删除数据。

凶猛的DoS攻击包括对联网设备配置的改变或物理攻击。物理的威胁通常最容易防御,传统的“门、警卫和枪”的安全原则在这种情况下可以发挥很好的作用。

自去年起,一种将攻击分布到几台不同的主机上的新攻击方式,带来了网上DoS攻击的盛行。这种方式通过利用多台被入侵主机的总处理能力和网络资源,增加了 成功渗透的可能性。这类DDoS(分布式拒绝服务)攻击在1999年变得人所尽知,当时攻击者利用“Stacheldraht”(德语中的“铁丝网”一 词)和TribeFloodNet工具造成包括Yahoo和eBay在内的一些最流行的Internet站点的瘫痪。在这两个案例中,这类工具使用了大规 模攻击方式来造成被攻击主机的瘫痪。

当然,无论是哪种攻击形式,DoS攻击一直就存在于我们身边:雷达和无线电“阻塞”就是典型的例子。但是,由于Internet正成为经济繁荣的支柱,因 此Internet数据流的任何中断都会像一只手正在掐住气管一样。下面是一些DoS破坏者喜爱用来掐住你的喉咙的最常用的方式。

“贪心攫取式”(“hogging”)是一种经典的攻击方式,它通常利用绕过正常的操作系统控制,在一个主机系统上运行程序,消耗系统资源直到操作系统失败并造成主机的瘫痪。

1998年出现的Robert Morris Internet蠕虫就是贪心攫取式攻击的很好例子,虽然由于这种攻击利用邮件发送病毒而一般被归类到特洛伊木马类型。Morris曾打算让他的程序能在 几天或几周的时间内悄悄地运行,不被检测到,但是一个拙劣的设计缺陷使它非常快地复制自己,因此在几分钟的时间内造成邮件服务器的瘫痪。

由于这类攻击已经出现了很长一段时间了,因此,许多操作系统采取了基本的防护措施。遗憾的是,正像任何Windows NT管理人员可以证实的那样,向一种操作系统添加特性增加了安全漏洞,因此不能将“强化”系统当作是堵塞漏洞的工程。

“恶意小应用程序”是将目标对准用户而非服务器的一种DoS攻击形式。基于小应用程序的攻击主要是通过使小应用程序可以缺省运行的Web浏览器来劫持计算 机。采取不允许小应用程序策略并使其不能运行的企业可以抵御这类攻击,但是,放弃享受小应用程序技术的好处可能是不值得的。

“邮件炸弹”简单但破坏性很大:它们利用大量的伪造数据流使邮件服务器过载。不用说,最大的邮件服务器也有其限度,因此,没有一种邮件系统可以避免这种攻击。

在上面几种情况中,你可能打算使用过滤器来识别和拒绝可疑的数据流,但是,你要冒不接受合法通信的风险。

“死亡之Ping”利用PING(Packet Internet Groper)来发送不合法长度的测试包。尽管这在IP环境中非常常见,但是,现在还没有什么能阻止它在IPX上执行。长度过长的包会在未加保护的系统中造成或引发网络问题。

“SYN泛滥(SYN flooding)”攻击是专门针对TCP的,它试图侵占所有可能的网络连接,从而拒绝对网络服务合法的访问。它利用了对两个主机之间对话进行初始化的SYN(同步顺序号)包的功能。

攻击者通过假冒包发送者的身份,然后发送大量的目标服务器必须回应的假数据包,使服务器忙于进行应答。被攻击的服务器除了可以为少数幸运地躲过虚假请求的用户所使用外,正常用户无法使用。

“Zombies”是指受到攻击者破坏并被其用于攻击(或被其准备用于攻击)的计算机。去年最流行的DoS攻击曾使用Zombie来产生足以造成最常访问的Internet站点运行停止的数据流。

应当做些什么?

遗憾的是,许多企业在攻击者大行其道之前,没有意识到自己存在的DoS脆弱性问题。即使攻击只是瞄准了你的网络连接,没有打算攻击敏感公司数据,开始实施防御仍太晚了。

反攻击不是一种好办法。我们决不提倡报复,因为你在最关键的时刻不能肯定攻击者是否使用其他人的身份作为掩护,而且任何基于网络的反攻击将违反你打算用来起诉罪犯(如果真到了这种程度的话)的法律。

显然,有一些事可以提前来做,以减少系统所存在的脆弱性。如果还没有装备一台好的、充分了解的防火墙的话,就应当装备一台。充分了解是关键,许多机构安装了防火墙,但却不能培训重要员工来配置和使用它。

值得庆幸的是,今天市面上的任何好的防火墙都被配置为拒绝所有的数据流,从而将问题缩小到明确允许通过的数据流上。此外,还应当对网络上的另一些设备,如交换机、路由器以及桌面计算机进行检查,确认它们只让允许的数据流类型通过。

其它一些可以采取的周边安全措施包括电子邮件过滤器和病毒检测软件。这类应用需要精心地维护才能发挥效力,不过它们在提供防火墙后面的防线上很有用。

拥有基准网络传输流数据可以帮助你将合法传输多媒体文件造成的数据流激增与黑客产生的数据流增加区分开来。

ManTrap追源技术是一种新型有趣的主动防御技术,这项技术提供了一种诱饵Web环境,它可以将黑客诱离你的王冠宝石,将他们引诱到一个安全的“笼子”中,在这个笼子中可以记录他们的活动,收集供执法之用的证据。

关注新闻

保持信息的灵通是取得任何好的防御战略的成功的关键。由于Internet的全球性本质,最初发生在菲律宾的问题可以在几分钟内影响到安装在加利福尼亚的服务器。

主流新闻媒体正越来越关注计算机在今天经济和社会中的重要性,并且通常是有关系统攻击和计算机病毒爆发的实时信息的很好来源。

值得强调的一项措施是保持应用程序和操作系统补丁程序的最新状态。这里存在的困难是如何在确保补丁程序不会造成系统的不稳定与拥有安全配置之间取得平衡。对补丁程序进行测试,一旦测试完成,就立即对设备进行升级。

高价的可管理性

确保设备,而不仅仅是计算机,被配置为只运行基本和必需的服务极为重要。虽然基于Web的界面无疑比Telnet控制台更漂亮,但是,Cisco用户经过惨痛的经验发现向路由器添加管理特性所造成的问题比它所解决的问题更多。

5月中旬,使用Cisco OS(它使路由器和交换机可以通过Web浏览器来显示数据)新版本的基于软件的HTTP服务器的机构曾得到警告,称在某些情况下,HTTP服务器可能会遭到破坏。

当时,该公司证实,其产品线中多种产品的核心组件Cisco IOS的多个版本都存在一种缺陷。该缺陷(其详细的说明可查看www.cisco.com/warp/public/707/ioshttpserver-pub.shtml)会造成交换机或路由器停机或重加载,从而造成服务的中断。

据Cisco Web站点提供的文件说,该缺陷“几乎影响到所有运行Cisco IOS 11.1到12.1版的主流Cisco路由器和交换机。”幸运的是,直到5月中旬,Cisco还未收到有关该缺陷被恶意利用的任何报告。该缺陷是在4月 27日首次发布在Bugtraq邮件列表上的。

从本质上讲,这个问题存在于向通常为网络管理员的联网用户提供管理信息的基于软件的HTTP服务器上。浏览“http:///%%”地址将造成路由器或交换机的崩溃。在某些情况下,这可能要求硬件重新启动进行恢复。最好的情况是设备至少要停机两分钟。

由于任何没有运行IOS的Cisco设备是自动免疫的,因此这里还不是一片黑暗。如果你没有在运行受影响的IOS版本的路由器和交换机上启动Web管理功能的话,就没有任何危险。

若想检查你的设备,可以先登录,然后发出“Show Version”命令,就能了解到是否运行了受影响的IOS版本。Cisco的缺陷说明还包括了一张发布版本和缺陷状态的表格。

即使你的设备受到了影响,这里仍有一些可以采取的补救措施。最容易的办法是在你可以向网络上所有设备部署IOS的修改版本(目前它已可供使用)前,停止使用Web管理特性,关闭路由器和交换机上的HTTP服务。5月底以后发布的维护版本将包括修补程序。

其它一些可以实施的临时修补办法包括以几种方式改变设备的访问列表。你可以采用一个标准的访问列表来限制HTTP服务的使用或使用一个扩展地址列表来阻止 受影响网络路径中的数据流。由于第二种办法会在极其复杂的配置中造成意想不到的后果,因此,你最好试一试不太复杂的办法。

基于浏览器的硬件管理并不是件坏事,但是,在不顾基本安全原则的条件下使用它时,它会带来客户没有做好应付准备的各种脆弱性。增强你的管理工具是一件好事,但是不应当削足适履地损害自己去实现它。

真实性检查

为最坏的情况做好准备是一项艰巨的任务,但是它可以在出现紧急情况时避免麻烦。各公司在危机出现时所犯的最大错误之一是强迫第一线的人等待,而上层管理人员却在忙着应付紧急情况。

企业的紧急情况回应小组的目的就是为了解决这一问题。预先确定谁负责切断网络连接、关闭或重新启动服务器或采取其它一些果断措施,可能会造成一些人的不满,但是当时间是关键因素时就值得这样做。

为最坏的情况做好准备的另一个方面是培训。模拟DoS攻击是确定你的机构何处存在脆弱性问题以及使机构人员熟悉紧急处理过程的最佳途径。解决这些问题虽然不会使你避免下一次攻击,但在关键任务上对雇员进行培训将使正确的反应成为一种程序化的事情。

某种形式的外部审计也是一个好办法。虽然“老虎队”可供雇佣来检测网络,但是我建议除了使用声誉最好的公司来进行这种工作外,不要使用任何的机构。最好寻找具有网络安全经验的专业审计机构,而非一位顾问。

抢占先机

本文中谈到的多数内容是一些常识,但是值得重申的是:不要启动不使用的服务,保持系统不断升级,在实际中使用将在出现紧急情况时使用的同样的应急计划,这样就会躲过下一次攻击,使你的工作和数据都完好无缺。

【导读】自99年后半年开始,DDoS攻击不断在Internet出现,并在应用的过程中不断的得到完善,在Unix或nt环境上截至目前已有一系列比较 成熟的软件产品,如Trinoo,TFN,TFN2K,STACHELDRATH等,他们基本核心及攻击思路是很相象的。

进入2000年以来,网络遭受攻击事件不断发生,全球许多著名网站如yahoo、cnn、buy、ebay、fbi,包括中国的新浪网相继遭到不 名身份的黑客攻击,值得注意的是,在这些攻击行为中,黑客摈弃了以往常常采用的更改主页这一对网站实际破坏性有限的做法,取而代之的是,在一定时间内,彻 底使被攻击的网络丧失正常服务功能,这种攻击手法为 DDoS,即分布式拒绝服务攻击(Distributed denial of service )。

简单的讲,拒绝服务就是用超出被攻击目标处理能力的海量数据包消耗可用系统,带宽资源,致使网络服务瘫痪的一种攻击手段。在早期, 拒绝服务攻击主要是针对处理能力比较弱的单机,如个人pc,或是窄带宽连接的网站,对拥有高带宽连接,高性能设备的网站影响不大,但在99年底,伴随着 DDoS的出现,这种高端网站高枕无忧的局面不复存在,与早期的DoS攻击由单台攻击主机发起,单兵作战相较,DDoS实现是借助数百,甚至数千台被植入 攻击守护进程的攻击主机同时发起的集团作战行为,在这种几百,几千对一的较量中, 网络服务提供商所面对的破坏力是空前巨大的。

拒绝服务攻击自问世以来,衍生了多种形式,现将两种使用较频繁的TCP-SYN flood, UDP flood做一个介绍 。TCP-SYN flood又称半开式连接攻击,每当我们进行一次标准的TCP连接(如WWW浏览,下载文件等)会有一个一个三次握手的过程,首先是请求方向服务方发送一 个SYN消息,服务方收到SYN后,会向请求方回送一个SYN-ACK表示确认,当请求方收到SYN-ACK后则再次向服务方发送一个ACK消息,一次成 功的TCP连接由此就建立,可以进行后续工作了,如图所示:

而TCP-SYN flood在它的实现过程中只有前两个步骤,当服务方收到请求方的SYN并回送SYN-ACK确认消息后, 请求方由于采用源地址欺骗等手段,致使服务方得不到ACK回应,这样,服务方会在一定时间处于等待接收请求方ACK消息的状态,一台服务器可用的TCP连 接是有限的,如果恶意攻击方快速连续的发送此类连接请求,则服务器可用TCP连接队列很快将会阻塞,系统可用资源,网络可用带宽急剧下降,无法向用户提供 正常的网络服务。

Udp在网络中的应用也是比较广泛的,比如DNS解析、realaudio实时音乐、网络管理、联网游戏等,基于udp的攻击种类也是比较多的, 如目前在互连网上提供www、mail等服务的设备一般为使用unix操作系统的服务器,他们默认是开放一些有被恶意利用可能的udp服务的,如: echo,chargen. echo服务回显接收到的每一个数据包,而原本作为测试功能的chargen服务会在收到每一个数据包时随机反馈一些字符,如果恶意攻击者将这两个udp 服务互指,则网络可用带宽会很快耗尽。

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我们可以通过修改注册表来减小DDOS对我们的伤害

1)设置生存时间

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

DefaultTTL REG_DWORD 0-0xff(0-255 十进制,默认值128)

说明:指定传出IP数据包中设置的默认生存时间(TTL)值.TTL决定了IP数据包在到达目标前在网络中生存的最大时间.它实际上限定了IP数 据包在丢弃前允许通过的路由器数量.有时利用此数值来探测远程主机操作系统.我建议设置为1,因为这里是ICMP数据包的寸活时间。越小对方用 PING DDOS你的话,一般1M带宽的话就必须要100台以上的肉鸡来实现。不修改20几台就可以搞定

2)防止ICMP重定向报文的攻击

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

EnableICMPRedirects REG_DWORD 0x0(默认值为0x1)

说明:该参数控制Windows 2000是否会改变其路由表以响应网络设备(如路由器)发送给它的ICMP重定向消息,有时会被利用来干坏事.Win2000中默认值为1,表示响应ICMP重定向报文.

3)禁止响应ICMP路由通告报文

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Inter

faces\interface

PerformRouterDiscovery REG_DWORD 0x0(默认值为0x2)

说明:“ICMP路由公告”功能可造成他人计算机的网络连接异常,数据被窃听,计算机被用于流量攻击等严重后果.此问题曾导致校园网某些局域网大 面积,长时间的网络异常.因此建议关闭响应ICMP路由通告报文.Win2000中默认值为2,表示当DHCP发送路由器发现选项时启用.

4)防止SYN洪水攻击

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

SynAttackProtect REG_DWORD 0x2(默认值为0x0)

说明:SYN攻击保护包括减少SYN-ACK重新传输次数,以减少分配资源所保留的时间.路由缓存项资源分配延迟,直到建立连接为止.如果 synattackprotect=2,则AFD的连接指示一直延迟到三路握手完成为止.注意,仅在TcpMaxHalfOpen和 TcpMaxHalfOpenRetried设置超出范围时,保护机制才会采取措施.

5) 禁止C$、D$一类的缺省共享

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters

AutoShareServer、REG_DWORD、0x0

6) 禁止ADMIN$缺省共享

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters

AutoShareWks、REG_DWORD、0x0

7) 限制IPC$缺省共享

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

restrictanonymous REG_DWORD 0x0 缺省

0x1 匿名用户无法列举本机用户列表

0x2 匿名用户无法连接本机IPC$共享

说明:不建议使用2,否则可能会造成你的一些服务无法启动,如SQL Server

8)不支持IGMP协议

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

IGMPLevel REG_DWORD 0x0(默认值为0x2)

说明:记得Win9x下有个bug,就是用可以用IGMP使别人蓝屏,修改注册表可以修正这个bug.Win2000虽然没这个bug了,但IGMP并不是必要的,因此照样可以去掉.改成0后用route print将看不到那个讨厌的224.0.0.0项了.

9)设置arp缓存老化时间设置

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services:\Tcpip\Parameters

ArpCacheLife REG_DWORD 0-0xFFFFFFFF(秒数,默认值为120秒)

ArpCacheMinReferencedLife REG_DWORD 0-0xFFFFFFFF(秒数,默认值为600)

说明:如果ArpCacheLife大于或等于ArpCacheMinReferencedLife,则引用或未引用的ARP缓存项在 ArpCacheLife秒后到期.如果ArpCacheLife小于ArpCacheMinReferencedLife,未引用项在 ArpCacheLife秒后到期,而引用项在ArpCacheMinReferencedLife秒后到期.每次将出站数据包发送到项的IP地址时,就 会引用ARP缓存中的项。

10)禁止死网关监测技术

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services:\Tcpip\Parameters

EnableDeadGWDetect REG_DWORD 0x0(默认值为ox1)

说明:如果你设置了多个网关,那么你的机器在处理多个连接有困难时,就会自动改用备份网关.有时候这并不是一项好主意,建议禁止死网关监测.

11)不支持路由功能

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services:\Tcpip\Parameters

IPEnableRouter REG_DWORD 0x0(默认值为0x0)

说明:把值设置为0x1可以使Win2000具备路由功能,由此带来不必要的问题.

12)做NAT时放大转换的对外端口最大值

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services:\Tcpip\Parameters

MaxUserPort REG_DWORD 5000-65534(十进制)(默认值0x1388–十进制为5000)

说明:当应用程序从系统请求可用的用户端口数时,该参数控制所使用的最大端口数.正常情况下,短期端口的分配数量为1024-5000.将该参数设置到有效范围以外时,就会使用最接近的有效数值(5000或65534).使用NAT时建议把值放大点.

13)修改MAC地址

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\

找到右窗口的说明为”网卡”的目录,

比如说是{4D36E972-E325-11CE-BFC1-08002BE10318}

展开之,在其下的0000,0001,0002…的分支中找到”DriverDesc”的键值为你网卡的说明,比如说 “DriverDesc”的值为”Intel 82559 Fast Ethernet LAN on Motherboard”然后在右窗口新建一字符串值,名字为”Networkaddress”,内容为你想要的MAC值,比如说是 “004040404040”然后重起计算机,ipconfig /all看看. 最后在加上个BLACKICE放火墙,应该可以抵抗一般的DDOS

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