{"id":1698,"date":"2014-12-16T19:19:03","date_gmt":"2014-12-16T19:19:02","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=1698"},"modified":"2023-11-28T11:22:23","modified_gmt":"2023-11-28T19:22:23","slug":"memcached-security-best-practices","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/memcached-security-best-practices\/","title":{"rendered":"Pr\u00e1ticas recomendadas de seguran\u00e7a do Memcached"},"content":{"rendered":"

Memcached<\/a> A seguran\u00e7a \u00e9 um t\u00f3pico importante desde que os caras da sensepost lan\u00e7aram o go-derper na blackhat.<\/p>\n

A apresenta\u00e7\u00e3o foi muito boa e informativa, mas parece que o entusiasmo em torno dela deixou muitas pessoas confusas. Embora grande parte do assunto tenha sido abordado na apresenta\u00e7\u00e3o, ele precisa ser reafirmado o m\u00e1ximo poss\u00edvel.<\/p>\n

Primeiro e sempre, o firewall<\/h3>\n

Isso realmente faz parte do teste de coloca\u00e7\u00e3o de administrador de sistemas e n\u00e3o tem nada a ver com memcached<\/a> em particular, mas vou mencion\u00e1-lo mesmo assim.<\/p>\n

Voc\u00ea sempre come\u00e7a com um firewall tudo<\/em> e, em seguida, permitir que apenas as coisas que voc\u00ea precisa passem para os locais onde voc\u00ea precisa que elas passem.<\/p>\n

N\u00e3o vou ensin\u00e1-lo a usar seu firewall, mas comece com a configura\u00e7\u00e3o que desativa toda a conectividade com sua caixa.<\/p>\n

Se estiver executando um servidor da Web, permita conex\u00f5es \u00e0 porta 443<\/code>. Se voc\u00ea tamb\u00e9m quiser conex\u00f5es n\u00e3o SSL, permita a porta 80<\/code>. Se esse \u00e9 o \u00fanico servi\u00e7o que voc\u00ea est\u00e1 fornecendo, ent\u00e3o seu firewall est\u00e1 completo!<\/p>\n

Gostaria de observar que Amazon EC2<\/span><\/u><\/a> faz isso por padr\u00e3o<\/em>No entanto, h\u00e1 um n\u00famero suficiente de firewalls mal configurados que eles sentiram a necessidade de enviar um formul\u00e1rio de e-mail a muitos de seus usu\u00e1rios para inform\u00e1-los de que eles \"t\u00eam pelo menos um grupo de seguran\u00e7a que permite que toda a Internet tenha acesso \u00e0 porta mais comumente usada por memcached<\/a> (11211)\".<\/p>\n

Verifique suas fixa\u00e7\u00f5es<\/h3>\n

Se o seu aplicativo for executado em apenas um servidor (com o aplicativo e o memcached<\/a> na mesma caixa), voc\u00ea pode vincul\u00e1-lo ao localhost adicionando<\/p>\n

\n
-l 127.0.0.1<\/div>\n<\/div>\n

para o memcached<\/a> bandeiras. Agora, mesmo que voc\u00ea tenha bloqueado o acesso a memcached<\/a>, voc\u00ea precisa ser em<\/em> a m\u00e1quina at\u00e9 mesmo para entrar em contato com o cache quando algu\u00e9m violar as configura\u00e7\u00f5es do firewall.<\/p>\n

Se voc\u00ea precisar, use SASL<\/h3>\n

As vers\u00f5es mais recentes do memcached<\/a> suporte \u00e0 criptografia SASL<\/span><\/u><\/a> autentica\u00e7\u00e3o.<\/p>\n

Embora voc\u00ea j\u00e1 tenha instalado um firewall em seu memcached<\/a> desativados, voc\u00ea pode exigir que os clientes executem uma autentica\u00e7\u00e3o forte antes de usar o servi\u00e7o.<\/p>\n

Por favor, Por favor<\/em> N\u00e3o executar como raiz<\/h3>\n

Em nenhuma circunst\u00e2ncia voc\u00ea deve tentar executar memcached<\/a> como raiz; ele n\u00e3o<\/em>\u00a0<\/span>deseja executar como root. Ele se esfor\u00e7a muito para evitar isso. No entanto, muitas pessoas t\u00eam uma \"solu\u00e7\u00e3o alternativa\" que permite memcached <\/a>para iniciar como root (que n\u00e3o vou repetir) apenas para tornar sua infraestrutura menos segura.<\/p>\n

Se algu\u00e9m, de alguma forma, contornar o firewall que voc\u00ea configurou para impedir o acesso a memcached<\/a> e, de alguma forma, consegue encontrar uma falha de seguran\u00e7a no memcached<\/a> permitindo a execu\u00e7\u00e3o de c\u00f3digo, voc\u00ea realmente<\/em> quer simplesmente entregar o acesso root?<\/p>\n

N\u00e3o h\u00e1 problemas conhecidos, mas n\u00e3o auditamos o c\u00f3digo para garantir que seja seguro execut\u00e1-lo como root. Mas tudo bem, porque nenhum administrador de sistemas respons\u00e1vel jamais executaria um servi\u00e7o como root sem uma justificativa muito forte e, provavelmente, com muito trabalho para criar um ambiente de jailed.<\/p>\n

Verifique suas configura\u00e7\u00f5es de firewall<\/h3>\n

N\u00e3o estou duvidando que voc\u00ea saiba como configurar seu firewall, mas tenha paci\u00eancia comigo.<\/p>\n

\"Knowing\"<\/a><\/div>\n

Agarrar nmap<\/span><\/u><\/a> ou similar. Execute uma varredura de porta completa em sua caixa - uma de um sistema confi\u00e1vel, uma de um sistema semiconfi\u00e1vel e uma de um sistema completamente n\u00e3o confi\u00e1vel.<\/p>\n

Se houver alguma resposta para algum servi\u00e7o que n\u00e3o possa justificar a execu\u00e7\u00e3o, agora voc\u00ea sabe disso e pode corrigi-lo.<\/p>\n

Isso \u00e9 n\u00e3o apenas o memcached<\/a> - Isso \u00e9 gearman, beanstalkd, snmpd, um servidor de correio eletr\u00f4nico, um servidor DNS, um servidor LDAP, etc.<\/p>\n

Para qualquer servi\u00e7o que voc\u00ea fazer<\/em> estejam em execu\u00e7\u00e3o e dispon\u00edveis publicamente, certifique-se de que voc\u00ea completamente<\/em> compreender as implica\u00e7\u00f5es de seguran\u00e7a da execu\u00e7\u00e3o desse servi\u00e7o.<\/p>\n

N\u00e3o tenha vergonha de perguntar se n\u00e3o estiver entendendo tudo. \u00c9 muito melhor do que ser um exemplo em uma apresenta\u00e7\u00e3o no pr\u00f3ximo black hat porque voc\u00ea est\u00e1 executando um servi\u00e7o que n\u00e3o pretendia e vazou informa\u00e7\u00f5es importantes.<\/p>","protected":false},"excerpt":{"rendered":"

Memcached security is a hot topic since the sensepost guys released go-derper\u00a0at blackhat. The presentation was pretty good and informative, but it seems like the hype around it has left a bunch of people confused. Although much of this was […]<\/p>","protected":false},"author":34,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[8992],"class_list":["post-1698","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nMemcached Security Best Practices: 5 to Keep an Eye On<\/title>\n<meta name=\"description\" content=\"This Couchbase blog includes 5 best practices in Memcached Security, including firewall tips, binding checks, SASL usage, and whether to Run as Root.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/memcached-security-best-practices\/\" \/>\n<meta property=\"og:locale\" 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