{"id":41229,"date":"2020-02-06T20:43:00","date_gmt":"2020-02-06T17:43:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/opasno-li-derzhat-otkrytym-rdp-v-internete"},"modified":"2020-02-06T20:43:00","modified_gmt":"2020-02-06T17:43:00","slug":"opasno-li-derzhat-otkrytym-rdp-v-internete","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/opasno-li-derzhat-otkrytym-rdp-v-internete","title":{"rendered":"\u00c9 perigoso manter o RDP aberto na Internet?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Frequentemente, ou\u00e7o a opini\u00e3o de que manter a porta RDP (Remote Desktop Protocol) aberta na Internet \u00e9 bastante inseguro e que n\u00e3o se deve fazer isso. O acesso ao RDP deve ser fornecido ou atrav\u00e9s de VPN, ou apenas de determinados endere\u00e7os IP 'brancos'.<\/p>\n<p><\/p>\n<p>Administro v\u00e1rios Servidores Windows para pequenas empresas, nas quais me foi dada a tarefa de garantir o acesso remoto ao Windows Server para os contadores. Essa \u00e9 uma tend\u00eancia moderna \u2014 trabalho de casa. Rapidamente percebi que for\u00e7ar os contadores a usarem VPN \u00e9 uma tarefa ingrata, e coletar todos os IPs para a lista branca n\u00e3o ser\u00e1 poss\u00edvel, pois os endere\u00e7os IP das pessoas s\u00e3o din\u00e2micos.<\/p>\n<p><\/p>\n<p>Portanto, segui o caminho mais simples \u2014 redirecionei a porta RDP para fora. Agora, para acessar, os contadores precisam iniciar o RDP e inserir o nome do host (incluindo a porta), o nome de usu\u00e1rio e a senha.<\/p>\n<p><\/p>\n<p>Neste artigo, compartilharei experi\u00eancias (tanto positivas quanto n\u00e3o t\u00e3o boas) e recomenda\u00e7\u00f5es.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>Riscos<\/h3>\n<p><\/p>\n<p>Quais s\u00e3o os riscos ao abrir a porta RDP?<\/p>\n<p><\/p>\n<p><b>1) Acesso n\u00e3o autorizado a dados sens\u00edveis<\/b><br \/>\nSe algu\u00e9m descobrir a senha do RDP, poder\u00e1 acessar dados que voc\u00ea deseja manter privados: estado das contas, saldos, dados de clientes, \u2026<\/p>\n<p><\/p>\n<p><b>2) Perda de dados<\/b><br \/>\nPor exemplo, como resultado da a\u00e7\u00e3o de um v\u00edrus criptografador.<br \/>\nOu a a\u00e7\u00e3o deliberada de um invasor.<\/p>\n<p><\/p>\n<p><b>3) Perda da esta\u00e7\u00e3o de trabalho<\/b><br \/>\nOs funcion\u00e1rios precisam trabalhar, mas o sistema est\u00e1 comprometido, precisando ser reinstalado \/ restaurado \/ configurado.<\/p>\n<p><\/p>\n<p><b>4) Comprometimento da rede local<\/b><br \/>\nSe um invasor obteve acesso a um computador Windows, ele poder\u00e1 acessar sistemas que n\u00e3o est\u00e3o dispon\u00edveis externamente, pela Internet. Por exemplo, compartilhamentos de arquivos, impressoras de rede etc.<\/p>\n<p>\n<b class=\"spoiler_title\">Tive um caso em que um Servidor Windows foi infectado por um criptografador<\/b><\/p>\n<p>e esse criptografador inicialmente criptografou a maioria dos arquivos no disco C:, e depois come\u00e7ou a criptografar arquivos no NAS via rede. Como o NAS era da Synology, com snapshots configurados, consegui restaur\u00e1-lo em 5 minutos, enquanto reinstalei o Servidor Windows do zero.<\/p>\n<p><\/p>\n<h3>Observa\u00e7\u00f5es e Recomenda\u00e7\u00f5es<\/h3>\n<p><\/p>\n<p>Monitoro os Servidores Windows atrav\u00e9s de <noindex><a rel=\"nofollow\" href=\"https:\/\/www.elastic.co\/beats\/winlogbeat\">Winlogbeat<\/a><\/noindex>, que envia logs para o ElasticSearch. No Kibana, h\u00e1 v\u00e1rias visualiza\u00e7\u00f5es, e ainda configurei um painel personalizado.<br \/>\nA monitoriza\u00e7\u00e3o em si n\u00e3o protege, mas ajuda a determinar as medidas necess\u00e1rias.<\/p>\n<p><\/p>\n<p>Aqui est\u00e3o algumas observa\u00e7\u00f5es:<br \/>\n<b>a) O RDP ser\u00e1 alvo de ataques de for\u00e7a bruta.<\/b><br \/>\nEm um dos servidores, configurei o RDP n\u00e3o na porta padr\u00e3o 3389, mas na 443 \u2014 para me camuflar como HTTPS. Mudar a porta padr\u00e3o \u00e9, provavelmente, uma boa ideia, mas isso n\u00e3o traz muitos benef\u00edcios. Aqui est\u00e3o as estat\u00edsticas deste servidor:<\/p>\n<p>\n<img decoding=\"async\" alt=\"\u00c9 perigoso manter o RDP aberto na Internet?\" src=\"\/wp-content\/uploads\/2020\/02\/6f7fccd9378d323b67a6186bde54fc2c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\u00c9 vis\u00edvel que, em uma semana, houve quase 400.000 tentativas falhadas de acesso via RDP.<br \/>\nObserva-se que as tentativas de acesso vieram de 55.001 endere\u00e7os IP (alguns IPs j\u00e1 estavam bloqueados por mim).<\/p>\n<p><\/p>\n<p>Aqui j\u00e1 se pode concluir que \u00e9 necess\u00e1rio instalar o fail2ban, mas <\/p>\n<p>\n<b class=\"spoiler_title\">Para Windows, n\u00e3o existe tal utilit\u00e1rio.<\/b><\/p>\n<p>Existem alguns projetos abandonados no GitHub que supostamente fazem isso, mas sequer tentei instal\u00e1-los:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/glasnt\/wail2ban\">https:\/\/github.com\/glasnt\/wail2ban<\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/EvanAnderson\/ts_block\">https:\/\/github.com\/EvanAnderson\/ts_block<\/a><\/noindex><\/p>\n<p><\/p>\n<p>Ainda h\u00e1 utilit\u00e1rios pagos, mas n\u00e3o os considerei.<\/p>\n<p><\/p>\n<p>Se voc\u00ea conhecer um utilit\u00e1rio aberto para esse fim \u2014 compartilhe nos coment\u00e1rios.<\/p>\n<p><\/p>\n<p><strong>Atualizar<\/strong>: Nos coment\u00e1rios, sugeriram que a porta 443 n\u00e3o \u00e9 uma boa escolha, e que seria melhor optar por portas mais altas (acima de 32000), pois a 443 \u00e9 escaneada com mais frequ\u00eancia, e identificar o RDP nessa porta n\u00e3o \u00e9 um problema.<\/p>\n<p><\/p>\n<p><strong>Update:<\/strong> Nos coment\u00e1rios, disseram que existe tal utilit\u00e1rio:<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/digitalruby\/ipban\">https:\/\/github.com\/digitalruby\/ipban<\/a><\/noindex><\/p>\n<p><\/p>\n<p><b>b) Existem certos nomes de usu\u00e1rio que os invasores preferem.<\/b><br \/>\nObserva-se que o ataque \u00e9 feito com uma combina\u00e7\u00e3o de nomes.<br \/>\nMas uma coisa que notei: uma quantidade significativa de tentativas usa o nome do servidor como login. Recomenda\u00e7\u00e3o: n\u00e3o use o mesmo nome para o computador e para o usu\u00e1rio. Al\u00e9m disso, algumas vezes, o nome do servidor parece ser analisado de alguma forma: por exemplo, para um sistema chamado DESKTOP-DFTHD7C, houve mais tentativas de acesso com o nome DFTHD7C:<\/p>\n<p>\n<img decoding=\"async\" alt=\"\u00c9 perigoso manter o RDP aberto na Internet?\" src=\"\/wp-content\/uploads\/2020\/02\/cd13cf169b3b9ed57db9e5706c735c06.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>Consequentemente, se voc\u00ea tiver um computador chamado DESKTOP-MARIA, provavelmente haver\u00e1 tentativas de acesso com o usu\u00e1rio MARIA.<\/p>\n<p><\/p>\n<p>Al\u00e9m disso, o que percebi pelos logs: na maioria dos sistemas, a maior parte das tentativas de acesso \u00e9 feita com o nome 'administrator'. E isso n\u00e3o \u00e9 \u00e0 toa, pois em muitas vers\u00f5es do Windows, esse usu\u00e1rio existe. Al\u00e9m disso, n\u00e3o pode ser removido. Isso facilita a tarefa para os invasores: em vez de adivinhar o nome e a senha, \u00e9 necess\u00e1rio apenas adivinhar a senha.<br \/>\nPor sinal, o sistema que foi infectado por um ransomware tinha o usu\u00e1rio Administrator e a senha Murmansk#9. N\u00e3o estou certo de como aquela m\u00e1quina foi invadida, porque comecei a monitorar justo depois desse incidente, mas acredito que a for\u00e7a bruta \u00e9 uma possibilidade.<br \/>\nEnt\u00e3o, se o usu\u00e1rio Administrator n\u00e3o pode ser removido, o que fazer? Ele pode ser renomeado!<\/p>\n<p><\/p>\n<p>As recomenda\u00e7\u00f5es deste ponto: <\/p>\n<p><\/p>\n<ul>\n<li>n\u00e3o use o nome de usu\u00e1rio no nome do computador<\/li>\n<li>certifique-se de que n\u00e3o h\u00e1 usu\u00e1rios Administrator no sistema<\/li>\n<li>use senhas seguras<\/li>\n<\/ul>\n<p><\/p>\n<p>Dessa forma, eu vejo que v\u00e1rios Windows Server sob meu controle est\u00e3o sendo atacados por brute force h\u00e1 alguns anos, e sem sucesso.<\/p>\n<p><\/p>\n<p>Como sei que sem sucesso?<br \/>\nPorque nas capturas de tela acima, \u00e9 poss\u00edvel ver que h\u00e1 logs de acessos bem-sucedidos via RDP, que cont\u00eam a informa\u00e7\u00e3o:<\/p>\n<p><\/p>\n<ul>\n<li>de qual IP<\/li>\n<li>de qual computador (hostname)<\/li>\n<li>nome de usu\u00e1rio<\/li>\n<li>informa\u00e7\u00f5es de GeoIP<\/li>\n<\/ul>\n<p><\/p>\n<p>E eu olho isso regularmente \u2014 n\u00e3o foram encontradas anomalias.<\/p>\n<p><\/p>\n<p>Ali\u00e1s, se algum IP est\u00e1 realizando ataques brute force de forma especialmente intensa, pode-se bloquear IPs (ou sub-redes) espec\u00edficos assim no PowerShell:<\/p>\n<p><\/p>\n<pre><code class=\"powershell\">New-NetFirewallRule -Direction Inbound -DisplayName \"fail2ban\" -Name \"fail2ban\" -RemoteAddress (\"185.143.0.0\/16\", \"185.153.0.0\/16\", \"193.188.0.0\/16\") -Action Block<\/code><\/pre>\n<p><\/p>\n<p>A prop\u00f3sito, na Elastic, al\u00e9m do Winlogbeat, tamb\u00e9m existe <noindex><a rel=\"nofollow\" href=\"https:\/\/www.elastic.co\/beats\/auditbeat\">Auditbeat<\/a><\/noindex>, que pode monitorar arquivos e processos no sistema. Tamb\u00e9m existe um aplicativo SIEM (Gerenciamento de Informa\u00e7\u00f5es e Eventos de Seguran\u00e7a) no Kibana. Eu experimentei ambos, mas n\u00e3o vi muita utilidade \u2014 parece que o Auditbeat ser\u00e1 mais \u00fatil para sistemas Linux, e o SIEM ainda n\u00e3o me apresentou nada claro.<\/p>\n<p><\/p>\n<p>E aqui est\u00e3o as recomenda\u00e7\u00f5es finais:<\/p>\n<p><\/p>\n<ul>\n<li>fa\u00e7a backups autom\u00e1ticos regulares.<\/li>\n<li>instale atualiza\u00e7\u00f5es de seguran\u00e7a em tempo h\u00e1bil<\/li>\n<\/ul>\n<p>\n<b class=\"spoiler_title\">B\u00f4nus: lista de 50 usu\u00e1rios que foram mais usados nas tentativas de acesso via RDP<\/b><\/p>\n<p>\"user.name: Descending\"<br \/>\nContagem<\/p>\n<p>dfthd7c (hostname)<br \/>\n842941<\/p>\n<p>winsrv1 (hostname)<br \/>\n266525<\/p>\n<p>ADMINISTRATOR<br \/>\n180678<\/p>\n<p>administrator<br \/>\n163842<\/p>\n<p>Administrator<br \/>\n53541<\/p>\n<p>michael<br \/>\n23101<\/p>\n<p>servidor<br \/>\n21983<\/p>\n<p>steve<br \/>\n21936<\/p>\n<p>john<br \/>\n21927<\/p>\n<p>paul<br \/>\n21913<\/p>\n<p>reception<br \/>\n21909<\/p>\n<p>mike<br \/>\n21899<\/p>\n<p>office<br \/>\n21888<\/p>\n<p>scanner<br \/>\n21887<\/p>\n<p>scan<br \/>\n21867<\/p>\n<p>david<br \/>\n21865<\/p>\n<p>chris<br \/>\n21860<\/p>\n<p>owner<br \/>\n21855<\/p>\n<p>manager<br \/>\n21852<\/p>\n<p>administrateur<br \/>\n21841<\/p>\n<p>brian<br \/>\n21839<\/p>\n<p>administrador<br \/>\n21837<\/p>\n<p>mark<br \/>\n21824<\/p>\n<p>staff<br \/>\n21806<\/p>\n<p>ADMIN<br \/>\n12748<\/p>\n<p>ROOT<br \/>\n7772<\/p>\n<p>ADMINISTRADOR<br \/>\n7325<\/p>\n<p>SUPPORT<br \/>\n5577<\/p>\n<p>SOPORTE<br \/>\n5418<\/p>\n<p>USU\u00c1RIO<br \/>\n4558<\/p>\n<p>admin<br \/>\n2832<\/p>\n<p>TEST<br \/>\n1928<\/p>\n<p>MySql<br \/>\n1664<\/p>\n<p>Admin<br \/>\n1652<\/p>\n<p>GUEST<br \/>\n1322<\/p>\n<p>USER1<br \/>\n1179<\/p>\n<p>SCANNER<br \/>\n1121<\/p>\n<p>SCAN<br \/>\n1032<\/p>\n<p>ADMINISTRATEUR<br \/>\n842<\/p>\n<p>ADMIN1<br \/>\n525<\/p>\n<p>BACKUP<br \/>\n518<\/p>\n<p>MySqlAdmin<br \/>\n518<\/p>\n<p>RECEPTION<br \/>\n490<\/p>\n<p>USER2<br \/>\n466<\/p>\n<p>TEMP<br \/>\n452<\/p>\n<p>SQLADMIN<br \/>\n450<\/p>\n<p>USER3<br \/>\n441<\/p>\n<p>1<br \/>\n422<\/p>\n<p>MANAGER<br \/>\n418<\/p>\n<p>\u00c9 comum ler a opini\u00e3o de que deixar a porta RDP (Remote Desktop Protocol) aberta na Internet \u00e9 bastante inseguro, e n\u00e3o se deve fazer isso.<br \/>\n410<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/487056\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0440\u0435\u0434\u043a\u043e \u044f \u0447\u0438\u0442\u0430\u043b \u043c\u043d\u0435\u043d\u0438\u0435, \u0447\u0442\u043e \u0434\u0435\u0440\u0436\u0430\u0442\u044c RDP (Remote Desktop Protocol) \u043f\u043e\u0440\u0442 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u043c \u0432 \u0418\u043d\u0442\u0435\u0440\u043d\u0435\u0442 \u2014 \u044d\u0442\u043e \u0432\u0435\u0441\u044c\u043c\u0430 \u043d\u0435\u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e, \u0438 \u0434\u0435\u043b\u0430\u0442\u044c \u0442\u0430\u043a \u043d\u0435 \u043d\u0430\u0434\u043e. \u0410 \u043d\u0430\u0434\u043e \u0434\u043e\u0441\u0442\u0443\u043f \u043a RDP \u0434\u0430\u0432\u0430\u0442\u044c \u0438\u043b\u0438 \u0447\u0435\u0440\u0435\u0437 VPN, \u0438\u043b\u0438 \u0442\u043e\u043b\u044c\u043a\u043e \u0441 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 &quot;\u0431\u0435\u043b\u044b\u0445&quot; IP \u0430\u0434\u0440\u0435\u0441\u043e\u0432. \u042f \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0438\u0440\u0443\u044e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e Windows Server \u0434\u043b\u044f \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u0438\u0445 \u0444\u0438\u0440\u043c, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043c\u043d\u0435 \u043f\u043e\u0441\u0442\u0430\u0432\u0438\u043b\u0438 \u0437\u0430\u0434\u0430\u0447\u0443 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0442\u044c \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":41230,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-41229","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041d\u0435\u0440\u0435\u0434\u043a\u043e \u044f \u0447\u0438\u0442\u0430\u043b \u043c\u043d\u0435\u043d\u0438\u0435, \u0447\u0442\u043e \u0434\u0435\u0440\u0436\u0430\u0442\u044c RDP (Remote Desktop Protocol) \u043f\u043e\u0440\u0442 \u043e\u0442\u043a\u0440\u044b\u0442\u044b\u043c \u0432 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