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Предотвращение вредоносного сканирования уязвимостей, увеличивающего нагрузку на сервер

На этой неделе мы прошли сканирование наших серверов на наличие вредоносных уязвимостей, что увеличило нагрузку на них и сделало их практически непригодными для использования.

Атаку легко защитить, просто заблокировав злоумышленник, но только после его обнаружения.

Есть ли какая-либо форма предотвращения этого? Это нормально, что один сервер становится практически непригодным для использования из-за одного из этих сканирований?

Это запросы к нашему серверу за одну секунду:

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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/win32-xp vs2005
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/92057
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[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
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[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
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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
[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
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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
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/171850
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/48321
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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
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/14294
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[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/187294
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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/chimplinebyline
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[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
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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
[Fri Mar 12 19:15:28 2010] [error] [client 213.37.49.231] File does not exist: /var/www/html/5099582
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[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

Заранее спасибо!

Вы можете настроить что-то вроде fail2bain чтобы немедленно заблокировать хосты, выполняющие сканирование через системный брандмауэр.

Не думаю, что вы видите сканирование уязвимостей. Вставленные вами записи журнала не типичны для любых типов зондов уязвимости, с которыми я когда-либо сталкивался. Возможно, стоит потратить дополнительное время на то, чтобы попытаться выяснить, что на самом деле происходит (взгляните на строки user-agent и referrer).

Вероятно, самым простым было бы создание сценария, который просматривает файл журнала и подсчитывает, сколько раз он видел один и тот же IP-адрес за последние n секунд. Как только он проходит произвольно выбранный порог, он запускает добавление правила iptables.