http://bbs.chinaunix.net/thread-571180-1-3.html
近来经常听到圈子里的朋友跟我提到CC这种攻击
见不到虚假ip
见不到特别大的流量
但无法进行正常连接
传说一条adsl 足以搞掂一台高性能服务器
据可靠消息 重庆电信的很多游戏服务器虽在黑洞之下但饱受CC之苦
本人只是耳闻并没有机会亲历
我在google搜索
CC相关内容很少
XFOCUS给出了一个什么CCsource作者是bigboyq
这里是他的blog http://blog.n-ku.com/blog.asp?name=bigboyq
我粗略的看了下CCsource这个东西
他的基本原理就是 攻击发起主机(attacker host) 多次通过 网络中的HTTP代理服务器(HTTP proxy) 向目标主机(target host) 上开销比较大的CGI页面发起HTTP请求造成目标主
机拒绝服务( Denial of Service )
这是一种很聪明的分布式拒绝服务攻击( Distributed Denial of Service )
与典型的分布式拒绝服务攻击不同 攻击者不需要去寻找大量的傀儡机 代理服务器充当了这个角色
bigboyq针对自己的CC提出了解决办法我引述原文:
“对于HTTP请求可以使用COOKIE和SESSION认证来判断是否是CC的请求页面，防止多代理的访问请求，而且CC通过代理攻击，代理在转发数据的时候会向HTTP服务器提交一个x-
forward-ip（好像是，这就是为什么我们有时使用了代理，对方服务器一样知道我们的真实IP）这样也是一个非常好的判断方法，因为网络上的代理虽然多，但是大部分都是非匿
名的，就是说会发送x-forward-ip的代理。”
简单的说bigboyq的这个CC攻击器的实现 可以通过特征过滤的办法 有效的解决
####我所听说的案例大部分都是游戏服务器,没有WEB服务的。但据攻击发起者宣称使用了CC。(接受wstest 的意见把这里改下)
####我提到我对CC的攻击案例也只是耳闻,不过我觉得这种攻击方式也就是利用proxy充当傀儡机是种不错的想法而且不应该只局限于对web的攻击我没有鼓励攻击之意只是就技术论技术
这说明这些案例中攻击者使用的CC并不是bigboyq写的CC,但据我个人估计很可能CC攻击都是用了同样的原理。
借助的可能是SOCKS5 proxy或者SOCK4 proxy。
这样attacker host通过socks proxy维持大量小流量连接占满target host应用层服务的连接数。造成拒绝服务。
例如很多apache连接数不过是512或者1024这是很容易造成DOS。
本贴意在抛砖引玉 希望行家们提供更准确地信息 揭开CC神秘的面纱
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