{"id":111332,"date":"2023-11-06T09:10:14","date_gmt":"2023-11-06T07:10:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-ingress-nginx-pozvolyayushhie-skomprometirovat-klastery-kubernetes"},"modified":"2023-11-06T09:10:14","modified_gmt":"2023-11-06T07:10:14","slug":"uyazvimosti-v-ingress-nginx-pozvolyayushhie-skomprometirovat-klastery-kubernetes","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimosti-v-ingress-nginx-pozvolyayushhie-skomprometirovat-klastery-kubernetes","title":{"rendered":"Vulnerabilidades no ingress-nginx que podem comprometer clusters Kubernetes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No projeto em desenvolvimento do controlador ingress do Kubernetes, ingress-nginx, foram identificadas tr\u00eas vulnerabilidades que permitem, na configura\u00e7\u00e3o padr\u00e3o, acessar as configura\u00e7\u00f5es do objeto Ingress, nas quais, entre outras coisas, est\u00e3o armazenadas as credenciais para acessar os servidores Kubernetes, possibilitando acesso privilegiado ao cluster. Os problemas se manifestam apenas no controlador ingress-nginx do projeto Kubernetes e n\u00e3o afetam o controlador kubernetes-ingress, desenvolvido pela equipe da NGINX. <\/p>\n

O controlador de ingress atua como um gateway e \u00e9 utilizado no Kubernetes para gerenciar o acesso da rede externa aos servi\u00e7os dentro do cluster. O controlador ingress-nginx \u00e9 o mais popular e aplica servidor<\/a> NGINX \u00e9 utilizado para redirecionar solicita\u00e7\u00f5es ao cluster, roteando solicita\u00e7\u00f5es externas e distribuindo a carga. O projeto Kubernetes fornece controladores ingress b\u00e1sicos para AWS, GCE e nginx, sendo que este \u00faltimo n\u00e3o est\u00e1 relacionado ao controlador kubernetes-ingress, que \u00e9 mantido pela empresa F5\/NGINX.

\"Vulnerabilidades<\/center> <\/p>\n

As vulnerabilidades CVE-2023-5043 e CVE-2023-5044 permitem a execu\u00e7\u00e3o de c\u00f3digo pr\u00f3prio com servidor<\/a> com os direitos do processo do controlador de ingresso, usando os par\u00e2metros «nginx.ingress.kubernetes.io\/configuration-snippet» e «nginx.ingress.kubernetes.io\/permanent-redirect» para sua substitui\u00e7\u00e3o. Entre outras coisas, os direitos de acesso obtidos permitem extrair um token usado para autentica\u00e7\u00e3o no n\u00edvel de gerenciamento do cluster. A vulnerabilidade CVE-2022-4886 permite contornar a verifica\u00e7\u00e3o de caminhos de arquivo usando a diretiva log_format. <\/p>\n

As duas primeiras vulnerabilidades se manifestam apenas em vers\u00f5es do ingress-nginx anteriores \u00e0 1.9.0, enquanto a \u00faltima \u2014 anterior \u00e0 1.8.0. Para realizar o ataque, o invasor deve ter acesso \u00e0 configura\u00e7\u00e3o do objeto ingress, por exemplo, em clusters Kubernetes multitenants, onde os usu\u00e1rios t\u00eam permiss\u00e3o para criar objetos em seu pr\u00f3prio namespace.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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permitem, na configura\u00e7\u00e3o padr\u00e3o, acessar as configura\u00e7\u00f5es do objeto Ingress, nas quais, entre outras coisas, est\u00e3o armazenadas as.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimosti-v-ingress-nginx-pozvolyayushhie-skomprometirovat-klastery-kubernetes","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 ingress-nginx, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 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