{"id":655,"date":"2023-04-22T15:04:24","date_gmt":"2023-04-22T18:04:24","guid":{"rendered":"https:\/\/techsecurity.com.br\/?p=655"},"modified":"2023-04-22T15:04:25","modified_gmt":"2023-04-22T18:04:25","slug":"kubernetes-rbac-explorado-em-larga-escala-por-campanha-de-malware-que-minera-criptomoeda","status":"publish","type":"post","link":"https:\/\/techsecurity.com.br\/2023\/04\/kubernetes-rbac-explorado-em-larga-escala-por-campanha-de-malware-que-minera-criptomoeda\/","title":{"rendered":"Kubernetes RBAC explorado em larga escala por campanha de malware que minera criptomoeda"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Uma ataque em larga escala identificado tem explorado o controle de acesso baseado em fun\u00e7\u00e3o (<a href=\"https:\/\/kubernetes.io\/docs\/reference\/access-authn-authz\/rbac\/\" target=\"_blank\" rel=\"noreferrer noopener\">RBAC<\/a>) do Kubernetes (K8s) para criar backdoors e executar mineradores de criptomoedas.<em> \u201cOs invasores tamb\u00e9m implantaram DaemonSets para assumir e sequestrar recursos dos clusters K8s que eles atacam\u201d<\/em>, disse a empresa de seguran\u00e7a em nuvem Aqua em um relat\u00f3rio compartilhado. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A empresa israelense, que apelidou o ataque de <strong>RBAC Buster<\/strong>, disse que encontrou 60 clusters K8s expostos que foram explorados pelos operadores da amea\u00e7a por tr\u00e1s desta campanha. A cadeia de ataque come\u00e7ou com o invasor obtendo acesso inicial por meio de um servidor API mal configurado, seguido pela verifica\u00e7\u00e3o de evid\u00eancias de malware mineiro concorrente no servidor comprometido e, em seguida, usando o RBAC para configurar a persist\u00eancia. <em>\u201cO invasor criou um novo ClusterRole com privil\u00e9gios pr\u00f3ximos ao n\u00edvel de administrador\u201d<\/em>, disse a empresa. <em>\u201cEm seguida, o invasor criou um &#8216;ServiceAccount&#8217;, &#8216;kube-controller&#8217; no namespace &#8216;kube-system'&#8221;<\/em>. Na invas\u00e3o observada contra seus honeypots K8s, o invasor tentou armar as chaves de acesso expostas da AWS para obter uma posi\u00e7\u00e3o entrincheirada no ambiente, roubar dados e escapar dos limites do cluster.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"728\" height=\"440\" src=\"https:\/\/techsecurity.com.br\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/04\/image-3.png\" alt=\"\" class=\"wp-image-656\" srcset=\"https:\/\/techsecurity.com.br\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/04\/image-3.png 728w, https:\/\/techsecurity.com.br\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2023\/04\/image-3-300x181.png 300w\" sizes=\"auto, (max-width: 728px) 100vw, 728px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A etapa final do ataque cria um DaemonSet para implantar uma imagem de cont\u00eainer hospedada no Docker (&#8220;kuberntesio\/kube-controller:1.0.1&#8221;) em todos os n\u00f3s. O cont\u00eainer, que foi puxado 14.399 vezes desde seu upload h\u00e1 cinco meses, abriga um minerador de criptomoedas. <em>&#8220;A imagem do cont\u00eainer chamada &#8216;kuberntesio\/kube-controller&#8217; \u00e9 um caso de erro de digita\u00e7\u00e3o que personifica a conta leg\u00edtima do &#8216;kubernetesio'&#8221;<\/em>, disse Aqua. <em>&#8220;A imagem tamb\u00e9m imita a popular imagem de cont\u00eainer &#8216;kube-controller-manager&#8217;, que \u00e9 um componente cr\u00edtico do plano de controle, executado em um pod em cada n\u00f3 mestre, respons\u00e1vel por detectar e responder a falhas de n\u00f3&#8221;<\/em>. Curiosamente, algumas das t\u00e1ticas descritas na campanha t\u00eam semelhan\u00e7as com outra opera\u00e7\u00e3o il\u00edcita de minera\u00e7\u00e3o de criptomoedas que tamb\u00e9m aproveitou DaemonSets para cunhar Dero e Monero. Atualmente n\u00e3o est\u00e1 claro se os dois conjuntos de ataques est\u00e3o relacionados.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Uma ataque em larga escala identificado tem explorado o controle de acesso baseado em fun\u00e7\u00e3o (RBAC) do Kubernetes (K8s) para [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":657,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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