防止恶意漏洞扫描增加服务器负载

防止恶意漏洞扫描增加服务器负载

本周我们的服务器遭受了一些恶意漏洞扫描,增加了服务器的负载,使其几乎无法使用。

这种攻击很容易防御,只要在发现之后封锁攻击 IP 即可。

有什么方法可以防止这种情况发生?由于其中一次扫描,一台服务器几乎无法使用,这是正常的吗?

这些是在一秒钟内对我们的服务器完成的请求:

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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/pyscgi
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/56926
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/svcastle-big
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/138553
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/138232
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/153367
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/42315
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/150012
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/160079
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/win32-xp vc60
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/163482
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/42642
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/174458
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/163109
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/spacer_greys
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/pdf_icon16
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/26346
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/190998
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/fforigins
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/aliens-0
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/step-update faad
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/13376
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/52647
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/155036
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/compl2
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/174323
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/42317
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/tsugumo
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/171850
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/184127
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/48321
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/162545
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/84180
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/135901
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/57817
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/6360574
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/124989
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/113314
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/sprite-tutorial
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/14294
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/191387
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/187294
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/178666
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/179653
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/wingide-users
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/16309095
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/169465
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/189399
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/172392
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/35627
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/2670901
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/177847
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/chimplinebyline
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/87518
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/154595
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/12811780
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/cdmenupro42
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/110131
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/95615
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/18464
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/lwedchoice-1999
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/5099582
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/100968
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/j-emacs
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/0206mathew
[Fri Mar 12 19:15:29 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/10844356

提前致谢!

答案1

您可以设置类似失败2贝恩立即阻止通过系统防火墙进行扫描的主机。

答案2

我认为您没有看到漏洞扫描。您粘贴的日志条目不是我遇到过的任何类型的漏洞探测的典型特征。可能值得花一些额外的时间来弄清楚到底发生了什么(查看用户代理和引荐来源字符串)。

最简单的方法可能是一个快速脚本,用于监视日志文件并记录过去 n 秒内看到相同 IP 地址的次数。一旦它通过任意选择的阈值,就会触发添加 iptables 规则。

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