{"id":99604,"date":"2021-03-29T10:22:51","date_gmt":"2021-03-29T08:22:51","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah"},"modified":"2021-03-29T10:22:51","modified_gmt":"2021-03-29T08:22:51","slug":"uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-npm-pakete-node-netmask-primenyaemom-v-270-tysyachah-proektah","title":{"rendered":"Vulnerabilidade no pacote NPM node-netmask, usado em 270 mil projetos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No pacote NPM node-netmask, que tem cerca de 3 milh\u00f5es de downloads por semana e \u00e9 usado como depend\u00eancia em mais de 270 mil projetos no GitHub, foi identificada uma vulnerabilidade (CVE-2021-28918) que permite contornar verifica\u00e7\u00f5es onde a m\u00e1scara de rede \u00e9 usada para determinar a inclus\u00e3o em intervalos de endere\u00e7os ou para filtragem. O problema foi corrigido na vers\u00e3o node-netmask 2.0.0. <\/p>\n

A vulnerabilidade permite que um endere\u00e7o IP externo seja tratado como um endere\u00e7o de rede interna e vice-versa. Com uma l\u00f3gica espec\u00edfica utilizando o m\u00f3dulo node-netmask no aplicativo, \u00e9 poss\u00edvel realizar ataques SSRF (Server-Side Request Forgery), RFI (Remote File Inclusion) e LFI (Local File Inclusion) para acessar recursos na rede interna e incluir na cadeia de execu\u00e7\u00e3o arquivos externos ou locais. O problema est\u00e1 no fato de que, segundo a especifica\u00e7\u00e3o, os valores de string de endere\u00e7os que come\u00e7am com zero devem ser interpretados como n\u00fameros octais, mas o m\u00f3dulo \u00abnode-netmask\u00bb n\u00e3o considera essa particularidade e os trata como n\u00fameros decimais. <\/p>\n

Por exemplo, um atacante pode solicitar um recurso local especificando o valor \u00ab0177.0.0.1\u00bb, que corresponde a \u00ab127.0.0.1\u00bb, mas o m\u00f3dulo \u00abnode-netmask\u00bb descartar\u00e1 o zero e interpretar\u00e1 \u00ab0177.0.0.1\u00bb como \u00ab177.0.0.1\u00bb, o que, ao avaliar as regras de acesso no aplicativo, n\u00e3o permitir\u00e1 identificar a equival\u00eancia com \u00ab127.0.0.1\u00bb. Da mesma forma, o atacante pode especificar o endere\u00e7o \u00ab0127.0.0.1\u00bb, que deve ser equivalente a \u00ab87.0.0.1\u00bb, mas o m\u00f3dulo \u00abnode-netmask\u00bb o processar\u00e1 como \u00ab127.0.0.1\u00bb. Igualmente, pode-se enganar a verifica\u00e7\u00e3o de acesso a endere\u00e7os intranet fornecendo valores como \u00ab012.0.0.1\u00bb (equivalente a \u00ab10.0.0.1\u00bb, mas que ao ser verificado ser\u00e1 tratado como \u00ab12.0.0.1\u00bb). <\/p>\n

Os pesquisadores que identificaram o problema o consideram catastr\u00f3fico e apresentam v\u00e1rios cen\u00e1rios de ataques, embora a maioria deles pare\u00e7a especulativa. Por exemplo, menciona-se a possibilidade de atacar aplica\u00e7\u00f5es baseadas em Node.js que estabelecem conex\u00f5es externas para solicitar recursos com base em par\u00e2metros ou dados da requisi\u00e7\u00e3o de entrada, mas a aplica\u00e7\u00e3o espec\u00edfica n\u00e3o \u00e9 nomeada nem detalhada. Mesmo que se encontrem aplica\u00e7\u00f5es que realizem o download de recursos com base em IPs inseridos. endere\u00e7os IP<\/a>, n\u00e3o est\u00e1 muito claro como a vulnerabilidade pode ser aplicada na pr\u00e1tica sem uma conex\u00e3o com a rede local ou sem obter controle sobre endere\u00e7os IP \"espelhados\". <\/p>\n

Os pesquisadores apenas hipotetizam que os propriet\u00e1rios de 87.0.0.1 (Telecom Italia) e 0177.0.0.1 (Brasil Telecom) t\u00eam a capacidade de contornar a restri\u00e7\u00e3o de acesso a 127.0.0.1. Um cen\u00e1rio mais realista seria o uso da vulnerabilidade para contornar v\u00e1rias listas de bloqueio implementadas no lado do aplicativo. O problema tamb\u00e9m pode ser utilizado para trocar defini\u00e7\u00f5es de intervalos de intranet no m\u00f3dulo NPM \u00abprivate-ip\u00bb.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 NPM-\u043f\u0430\u043a\u0435\u0442\u0435 node-netmask, \u043d\u0430\u0441\u0447\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0435\u043c \u043e\u043a\u043e\u043b\u043e 3 \u043c\u043b\u043d \u0437\u0430\u0433\u0440\u0443\u0437\u043e\u043a \u0432 \u043d\u0435\u0434\u0435\u043b\u044e \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u043c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0437\u0430\u0432\u0438\u0441\u0438\u043c\u043e\u0441\u0442\u0438 \u0443 \u0431\u043e\u043b\u0435\u0435 270 \u0442\u044b\u0441\u044f\u0447 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u0432 \u043d\u0430 GitHub, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-28918), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0431\u043e\u0439\u0442\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u0430\u044f \u043c\u0430\u0441\u043a\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0434\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0432\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0432 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d\u044b \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0438\u043b\u0438 \u0434\u043b\u044f \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 node-netmask 2.0.0. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0432\u043d\u0435\u0448\u043d\u0435\u0433\u043e IP-\u0430\u0434\u0440\u0435\u0441\u0430 \u043a\u0430\u043a […]<\/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":[702],"tags":[],"class_list":["post-99604","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilidade no pacote NPM node-netmask, utilizado em 270 mil projetos | ProHoster","description":"No pacote NPM node-netmask, que tem cerca de 3 milh\u00f5es de downloads por semana e \u00e9 utilizado como depend\u00eancia por mais de 270 mil projetos no GitHub, foi identificada uma vulnerabilidade (CVE-2021-28918) que permite contornar as 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