![防止恶意漏洞扫描增加服务器负载](https://linux22.com/image/508436/%E9%98%B2%E6%AD%A2%E6%81%B6%E6%84%8F%E6%BC%8F%E6%B4%9E%E6%89%AB%E6%8F%8F%E5%A2%9E%E5%8A%A0%E6%9C%8D%E5%8A%A1%E5%99%A8%E8%B4%9F%E8%BD%BD.png)
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/svcastle-big
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[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
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[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
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/compl2
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/tsugumo
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/sprite-tutorial
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[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
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/lwedchoice-1999
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[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。