{"id":93156,"date":"2020-09-03T19:42:00","date_gmt":"2020-09-03T17:42:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov"},"modified":"2020-09-03T19:42:00","modified_gmt":"2020-09-03T17:42:00","slug":"uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimosti-v-skanerah-bezopasnosti-obrazov-docker-kontejnerov","title":{"rendered":"Vulnerabilidades em scanners de seguran\u00e7a de imagens de cont\u00eaineres Docker","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Publicado<\/a><\/noindex> resultados dos testes de ferramentas para identificar vulnerabilidades n\u00e3o corrigidas e problemas de seguran\u00e7a em imagens de cont\u00eaineres Docker isolados. A verifica\u00e7\u00e3o mostrou que em 4 dos 6 conhecidos scanners de imagens Docker havia vulnerabilidades cr\u00edticas que permitiam atacar diretamente o pr\u00f3prio scanner e conseguir a execu\u00e7\u00e3o do seu c\u00f3digo no sistema, em alguns casos (por exemplo, ao usar Snyk) com privil\u00e9gios de root. <\/p>\n

Para realizar o ataque, um agressor apenas precisa iniciar a verifica\u00e7\u00e3o de seu Dockerfile ou manifest.json, incluindo metadados especialmente formatados, ou colocar dentro da imagem arquivos Podfile e gradlew. Prot\u00f3tipos de exploits foram preparados<\/a><\/noindex> para os sistemas
\nWhiteSource<\/a><\/noindex>, Snyk<\/a><\/noindex>,
\nFossa<\/a><\/noindex> e
\nAnchore<\/a><\/noindex>. O pacote Clair<\/a><\/noindex>, originalmente escrito com foco em garantir seguran\u00e7a, demonstrou a melhor seguran\u00e7a. Nenhum problema foi identificado no pacote Trivy<\/a><\/noindex>. Em conclus\u00e3o, foi determinado que os scanners de cont\u00eaineres Docker devem ser executados em ambientes isolados ou usados apenas para verificar suas pr\u00f3prias imagens, e tamb\u00e9m deve-se ter cautela ao conectar tais ferramentas a sistemas automatizados de integra\u00e7\u00e3o cont\u00ednua.<\/p>\n

No FOSSA, Snyk e WhiteSource, a vulnerabilidade estava relacionada \u00e0 chamada de um gerenciador de pacotes externo para determinar depend\u00eancias, permitindo a execu\u00e7\u00e3o do seu c\u00f3digo ao especificar os comandos touch e system nos arquivos gradlew<\/a><\/noindex> e Podfile<\/a><\/noindex>.<\/p>\n

No Snyk e WhiteSource, tamb\u00e9m foram encontradas<\/a><\/noindex> no aplicativo para Windows, que permitia ao usu\u00e1rio elevar seus privil\u00e9gios no sistema para administrador (a vulnerabilidade foi causada pela intera\u00e7\u00e3o inadequada entre o cliente GUI sem privil\u00e9gios e o servi\u00e7o de sistema).<\/a><\/noindex>, relacionadas<\/a><\/noindex> com a organiza\u00e7\u00e3o do lan\u00e7amento de comandos do sistema ao analisar o Dockerfile (por exemplo, no Snyk, \u00e9 poss\u00edvel substituir o utilit\u00e1rio \/bin\/ls chamado pelo scanner, e no WhiteSource, o c\u00f3digo pode ser injetado atrav\u00e9s de argumentos na forma de «echo ‘;touch \/tmp\/hacked_whitesource_pip;=1.0′»). <\/p>\n

No Anchore, a vulnerabilidade foi causada<\/a><\/noindex> pelo uso da utilit\u00e1ria skopeo<\/a><\/noindex> para trabalhar com imagens Docker. A explora\u00e7\u00e3o se resumia a adicionar no arquivo manifest.json par\u00e2metros do tipo ‘»os»: «$(touch hacked_anchore)»‘, que s\u00e3o inseridos ao chamar o skopeo sem a devida escapa\u00e7\u00e3o (apenas os caracteres «;&<>» eram removidos, mas a constru\u00e7\u00e3o «$()» era permitida).<\/p>\n

O mesmo autor conduziu um estudo sobre a efic\u00e1cia na detec\u00e7\u00e3o de vulnerabilidades n\u00e3o corrigidas por scanners de seguran\u00e7a de cont\u00eaineres Docker e a taxa de falsos positivos (parte 1<\/a><\/noindex>, parte 2<\/a><\/noindex>, parte 3<\/a><\/noindex>). Abaixo est\u00e3o os resultados dos testes de 73 imagens, que cont\u00eam vulnerabilidades conhecidas, al\u00e9m de uma avalia\u00e7\u00e3o da efic\u00e1cia na detec\u00e7\u00e3o de aplicativos padr\u00e3o nas imagens (nginx, tomcat, haproxy, gunicorn, redis, ruby, node).<\/p>\n

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

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

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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