{"id":55464,"date":"2020-01-21T00:00:00","date_gmt":"2020-01-20T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli"},"modified":"2020-02-18T14:03:35","modified_gmt":"2020-02-18T11:03:35","slug":"kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/kak-kriticheskaya-uyazvimost-citrix-netscaler-cve-2019-19781-obnazhila-skrytye-problemy-it-otrasli","title":{"rendered":"Como uma vulnerabilidade cr\u00edtica do Citrix NetScaler CVE-2019-19781 exp\u00f4s problemas ocultos na ind\u00fastria de TI","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Caro leitor, antes de mais nada, gostaria de destacar que, como residente na Alemanha, estou principalmente descrevendo a situa\u00e7\u00e3o neste pa\u00eds. \u00c9 poss\u00edvel que a situa\u00e7\u00e3o em seu pa\u00eds seja completamente diferente.<\/p>\n<p>Em 17 de dezembro de 2019, foi publicada na p\u00e1gina do Citrix Knowledge Center uma informa\u00e7\u00e3o sobre uma vulnerabilidade cr\u00edtica nas linhas de produtos Citrix Application Delivery Controller (NetScaler ADC) e Citrix Gateway, conhecido popularmente como NetScaler Gateway. <noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex>Posteriormente, a vulnerabilidade tamb\u00e9m foi encontrada na linha SD-WAN. Ela afetou todas as vers\u00f5es dos produtos, desde a 10.5 at\u00e9 a atual 13.0, permitindo que um invasor n\u00e3o autorizado executasse c\u00f3digo malicioso no sistema, praticamente transformando o NetScaler em uma plataforma para futuros ataques \u00e0 rede interna.<\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX267027\">CTX267027: CVE-2019-19781 \u2014 Vulnerabilidade no Citrix Application Delivery Controller<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX267679\">CTX267679: Etapas de Mitiga\u00e7\u00e3o para CVE-2019-19781<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/support.citrix.com\/article\/CTX269180\">CTX269180: CVE-2019-19781 \u2013 Ferramenta de Verifica\u00e7\u00e3o (Publicado em 15.01.2020!)<\/a><\/noindex><\/li>\n<\/ul>\n<p>\nAo mesmo tempo que publicava informa\u00e7\u00f5es sobre a vulnerabilidade, a Citrix divulgou recomenda\u00e7\u00f5es para redu\u00e7\u00e3o de riscos (Workaround). O fechamento completo da vulnerabilidade foi prometido apenas para o final de janeiro de 2020.<\/p>\n<p>A criticidade dessa vulnerabilidade (n\u00famero CVE-2019-19781) foi <noindex><a rel=\"nofollow\" href=\"https:\/\/nvd.nist.gov\/vuln\/detail\/CVE-2019-19781\">avaliada em 9.8 pontos de 10<\/a><\/noindex>. Segundo <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ptsecurity.com\/ru-ru\/about\/news\/obnaruzhena-uyazvimost-v-po-citrix-pozvolyayushchaya-proniknut-v-seti-80-000-kompaniy\/\">informa\u00e7\u00f5es da Positive Technologies<\/a><\/noindex> a vulnerabilidade afeta mais de 80 mil empresas em todo o mundo.<\/p>\n<h3>Poss\u00edvel rea\u00e7\u00e3o \u00e0 not\u00edcia<\/h3>\n<p>\nComo uma pessoa respons\u00e1vel, eu acreditava que todos os profissionais de TI que possuem produtos NetScaler em sua infraestrutura tomaram as seguintes medidas:<\/p>\n<ol>\n<li>implementaram imediatamente todas as recomenda\u00e7\u00f5es mencionadas no artigo CTX267679 para minimizar riscos.<\/li>\n<li>reverificaram as configura\u00e7\u00f5es do Firewall, em rela\u00e7\u00e3o ao tr\u00e1fego permitido do NetScaler para a rede interna.<\/li>\n<li>recomendaram aos administradores de seguran\u00e7a de TI que prestassem aten\u00e7\u00e3o a \"tentativas incomuns\" de acesso ao NetScaler e, se necess\u00e1rio, as bloqueassem. Lembro que o NetScaler geralmente \u00e9 colocado em DMZ.<\/li>\n<li>avaliaram a possibilidade de desconectar temporariamente o NetScaler da rede at\u00e9 obter mais informa\u00e7\u00f5es detalhadas sobre o problema. Durante as f\u00e9rias pr\u00e9-natalinas, feriados, etc., isso n\u00e3o seria t\u00e3o doloroso. Al\u00e9m disso, muitas empresas t\u00eam a op\u00e7\u00e3o alternativa de acesso via VPN.<\/li>\n<\/ol>\n<p><\/p>\n<h3>O que aconteceu a seguir?<\/h3>\n<p>\nInfelizmente, como se ver\u00e1 mais adiante, as etapas descritas acima, que s\u00e3o uma abordagem padr\u00e3o, foram em sua maioria ignoradas. <\/p>\n<p>muitos especialistas respons\u00e1veis pela infraestrutura Citrix s\u00f3 descobriram a vulnerabilidade em 13.01.2020 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tagesschau.de\/investigativ\/swr\/citrix-sicherheitsluecke-101.html\">das not\u00edcias principais<\/a><\/noindex>. Descobriram naquele momento, quando um grande n\u00famero de sistemas sob sua responsabilidade foi comprometido. A absurdidade da situa\u00e7\u00e3o chegou a tal ponto que os exploits necess\u00e1rios podiam ser <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/projectzeroindia\/CVE-2019-19781\">baixados legalmente da internet<\/a><\/noindex>.<br \/>\nPor algum motivo, eu achava que os especialistas em TI liam as newsletters dos fabricantes dos sistemas que administravam, usavam o Twitter, seguiam especialistas renomados em suas \u00e1reas e deviam estar cientes dos eventos atuais.<\/p>\n<p>Na verdade, por mais de tr\u00eas semanas, muitos clientes da Citrix ignoraram totalmente as recomenda\u00e7\u00f5es do fabricante. E os clientes da Citrix s\u00e3o praticamente todas as grandes e m\u00e9dias empresas da Alemanha, assim como quase todas as institui\u00e7\u00f5es governamentais. A vulnerabilidade afetou, principalmente, as estruturas governamentais.<\/p>\n<h3>Pelo menos h\u00e1 o que fazer<\/h3>\n<p>\nAqueles cujos sistemas foram comprometidos precisam de uma reinstala\u00e7\u00e3o completa, incluindo a substitui\u00e7\u00e3o dos certificados TSL. \u00c9 poss\u00edvel que os clientes da Citrix que esperavam um envolvimento mais ativo do fabricante na resolu\u00e7\u00e3o dessa vulnerabilidade cr\u00edtica comecem a procurar alternativas. \u00c9 preciso reconhecer que a rea\u00e7\u00e3o da Citrix n\u00e3o inspira otimismo.<\/p>\n<h3>H\u00e1 mais perguntas do que respostas<\/h3>\n<p>\nSurge a quest\u00e3o: o que estavam fazendo os numerosos parceiros da Citrix, platinum e gold? Por que apenas na terceira semana de 2020 algumas informa\u00e7\u00f5es necess\u00e1rias come\u00e7aram a aparecer nas p\u00e1ginas de certos parceiros da Citrix? \u00c9 evidente que at\u00e9 mesmo os consultores externos bem remunerados tamb\u00e9m n\u00e3o perceberam essa situa\u00e7\u00e3o perigosa. N\u00e3o quero ofender ningu\u00e9m, mas a fun\u00e7\u00e3o do parceiro \u00e9, em primeiro lugar, prevenir problemas emergentes, e n\u00e3o apenas oferecer = vender assist\u00eancia na sua resolu\u00e7\u00e3o.<\/p>\n<p>De fato, esta situa\u00e7\u00e3o mostrou a real condi\u00e7\u00e3o da seguran\u00e7a da informa\u00e7\u00e3o. Tanto os funcion\u00e1rios dos departamentos de TI das empresas quanto os consultores das firmas parceiras da Citrix precisam entender uma verdade: se h\u00e1 uma vulnerabilidade, ela deve ser corrigida. E uma vulnerabilidade cr\u00edtica deve ser corrigida imediatamente!<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/484548\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0440\u043e\u0433\u043e\u0439 \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044c, \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u0431\u0443\u0434\u0443\u0447\u0438 \u0436\u0438\u0442\u0435\u043b\u0435\u043c \u0413\u0435\u0440\u043c\u0430\u043d\u0438\u0438, \u044f \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u043e\u043f\u0438\u0441\u044b\u0432\u0430\u044e \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044e \u0432 \u0434\u0430\u043d\u043d\u043e\u0439 \u0441\u0442\u0440\u0430\u043d\u0435. \u0412\u043e\u0437\u043c\u043e\u0436\u043d\u043e, \u0432 \u0432\u0430\u0448\u0435\u0439 \u0441\u0442\u0440\u0430\u043d\u0435 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044f \u043a\u0430\u0440\u0434\u0438\u043d\u0430\u043b\u044c\u043d\u043e \u0438\u043d\u0430\u044f. 17 \u0434\u0435\u043a\u0430\u0431\u0440\u044f 2019 \u0433\u043e\u0434\u0430 \u043d\u0430 \u0441\u0442\u0440\u0430\u043d\u0438\u0446\u0435 Citrix Knowledge Center \u0431\u044b\u043b\u0430 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u043b\u0438\u043d\u0435\u0439\u043a\u0430\u0445 \u043f\u0440\u043e\u0434\u0443\u043a\u0442\u043e\u0432 Citrix Application Delivery Controller (NetScaler ADC) \u0438 Citrix Gateway, [&hellip;]<\/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":[688],"tags":[],"class_list":["post-55464","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0440\u043e\u0433\u043e\u0439 \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044c, \u043f\u0440\u0435\u0436\u0434\u0435 \u0432\u0441\u0435\u0433\u043e \u0445\u043e\u0442\u0435\u043b\u043e\u0441\u044c \u0431\u044b \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043d\u0430 \u0442\u043e, \u0447\u0442\u043e \u0431\u0443\u0434\u0443\u0447\u0438 \u0436\u0438\u0442\u0435\u043b\u0435\u043c \u0413\u0435\u0440\u043c\u0430\u043d\u0438\u0438, \u044f 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