{"id":116409,"date":"2024-06-07T09:39:55","date_gmt":"2024-06-07T07:39:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-openssh-dobavlena-vstroennaya-zashhita-ot-atak-po-podboru-parolej"},"modified":"2024-06-07T09:39:55","modified_gmt":"2024-06-07T07:39:55","slug":"v-openssh-dobavlena-vstroennaya-zashhita-ot-atak-po-podboru-parolej","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/v-openssh-dobavlena-vstroennaya-zashhita-ot-atak-po-podboru-parolej","title":{"rendered":"O OpenSSH agora possui prote\u00e7\u00e3o embutida contra ataques de for\u00e7a bruta.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

O c\u00f3digo-fonte do OpenSSH agora inclui uma prote\u00e7\u00e3o embutida contra ataques automatizados de for\u00e7a bruta, onde bots tentam adivinhar a senha do usu\u00e1rio por meio da combina\u00e7\u00e3o de diferentes padr\u00f5es. Para bloquear tais ataques, o arquivo de configura\u00e7\u00e3o sshd_config ganhou o par\u00e2metro PerSourcePenalties, que permite definir um limiar de bloqueio ativado ap\u00f3s muitas tentativas de conex\u00e3o malsucedidas provenientes de um \u00fanico endere\u00e7o IP. Este novo mecanismo de prote\u00e7\u00e3o ser\u00e1 inclu\u00eddo na pr\u00f3xima vers\u00e3o do OpenSSH e estar\u00e1 habilitado por padr\u00e3o no OpenBSD 7.6. <\/p>\n

Com a prote\u00e7\u00e3o ativada, o processo sshd come\u00e7a a monitorar o status de conclus\u00e3o dos processos filhotes, identificando situa\u00e7\u00f5es em que a autentica\u00e7\u00e3o falha ou quando o processo foi encerrado abruptamente devido a um erro. Uma alta frequ\u00eancia de falhas na autentica\u00e7\u00e3o indica tentativas de for\u00e7a bruta, enquanto um t\u00e9rmino abrupto pode sinalizar tentativas de explora\u00e7\u00e3o de vulnerabilidades no sshd. <\/p>\n

Atrav\u00e9s do par\u00e2metro PerSourcePenalties, \u00e9 definido um limiar m\u00ednimo para eventos an\u00f4malos, ap\u00f3s o qual o endere\u00e7o IP com atividade suspeita ser\u00e1 bloqueado. Com o par\u00e2metro PerSourceNetBlockSize, tamb\u00e9m \u00e9 poss\u00edvel definir uma m\u00e1scara de sub-rede para bloquear toda a sub-rede \u00e0 qual pertence o IP problem\u00e1tico. <\/p>\n

Para desativar o bloqueio em determinadas sub-redes, foi proposto o par\u00e2metro PerSourcePenaltyExemptList, que pode ser \u00fatil em situa\u00e7\u00f5es que levam a falsos positivos, como quando m\u00faltiplos usu\u00e1rios de uma grande rede acessam o servidor SSH com o mesmo IP devido ao uso de um tradutor de endere\u00e7os ou proxy.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 OpenSSH \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u0432\u0441\u0442\u0440\u043e\u0435\u043d\u043d\u0430\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u0430\u0442\u0430\u043a \u043f\u043e \u043f\u043e\u0434\u0431\u043e\u0440\u0443 \u043f\u0430\u0440\u043e\u043b\u0435\u0439, \u0432 \u0445\u043e\u0434\u0435 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0431\u043e\u0442\u044b \u043f\u044b\u0442\u0430\u044e\u0442\u0441\u044f \u0443\u0433\u0430\u0434\u0430\u0442\u044c \u043f\u0430\u0440\u043e\u043b\u044c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f, \u043f\u0435\u0440\u0435\u0431\u0438\u0440\u0430\u044f \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0442\u0438\u043f\u043e\u0432\u044b\u0435 \u043a\u043e\u043c\u0431\u0438\u043d\u0430\u0446\u0438\u0438. 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IP-\u0430\u0434\u0440\u0435\u0441\u0430. \u041d\u043e\u0432\u044b\u0439 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0437\u0430\u0449\u0438\u0442\u044b \u0432\u043e\u0439\u0434\u0451\u0442 \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-116409","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47O OpenSSH agora conta com prote\u00e7\u00e3o embutida contra ataques de for\u00e7a bruta | ProHoster","description":"O c\u00f3digo-fonte do OpenSSH agora inclui uma prote\u00e7\u00e3o embutida contra ataques automatizados de 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