{"id":48599,"date":"2025-09-17T18:08:56","date_gmt":"2025-09-17T18:08:56","guid":{"rendered":"https:\/\/becolve.com\/blog\/uma-nova-solucao-para-evitar-supply-chain-attacks-e-garantir-a-integridade-do-firmware-software-instalado-em-ambientes-ot-criticos\/"},"modified":"2025-09-17T18:09:00","modified_gmt":"2025-09-17T18:09:00","slug":"uma-nova-solucao-para-evitar-supply-chain-attacks-e-garantir-a-integridade-do-firmware-software-instalado-em-ambientes-ot-criticos","status":"publish","type":"blog","link":"https:\/\/becolve.com\/pt-pt\/blog\/uma-nova-solucao-para-evitar-supply-chain-attacks-e-garantir-a-integridade-do-firmware-software-instalado-em-ambientes-ot-criticos\/","title":{"rendered":"Uma nova solu\u00e7\u00e3o para evitar \u201cSupply Chain Attacks\u201d e garantir a integridade do firmware\/software instalado em ambientes OT \/ Cr\u00edticos"},"content":{"rendered":"

[et_pb_section bb_built=”1″][et_pb_row][et_pb_column type=”4_4″][et_pb_text _builder_version=”3.19.3″]<\/p>\n

Foi em novembro de 2014, quando public\u00e1mos este artigo<\/a> no qual explic\u00e1vamos como a APT Dragonfly<\/strong> tinha sido capaz de:<\/p>\n

    \n
  1. Aceder \u00e0s \u00e1reas de download de firmware<\/strong> das empresas Mesa Imaging<\/strong> (fornecedor de c\u00e2maras utilizadas para vis\u00e3o guiada de ve\u00edculos em ambientes industriais), eWon e MB Connect (fornecedores de solu\u00e7\u00f5es para acesso remoto e telegest\u00e3o de ambientes industriais).<\/li>\n
  2. Modificar o software\/firmware<\/strong> (principalmente drivers) leg\u00edtimo e os certificados emitidos pelos fabricantes, incluindo no firmware um malware malicioso (um troiano em particular).<\/li>\n
  3. Proporcionar aos utilizadores o acesso<\/strong> a este firmware \u201cmodificado\u201d, de forma que a infe\u00e7\u00e3o se realizava atrav\u00e9s do download e instala\u00e7\u00e3o do referido firmware n\u00e3o leg\u00edtimo.<\/li>\n<\/ol>\n

    A ast\u00facia do grupo APT<\/strong>, juntamente com, provavelmente, a aus\u00eancia de procedimentos e sistemas que permitissem comparar a fun\u00e7\u00e3o Hash<\/strong> primig\u00e9nia fornecida pelo fabricante com a que se obteria ap\u00f3s descarregar o firmware, fizeram com que diferentes empresas dos setores farmac\u00eautico, alimentar, de bebidas e \u00e1guas fossem infetadas.<\/p>\n

    Este tipo de ataques, conhecido como \u201cSupply Chain Attack\u201d<\/strong>, \u00e9 cada vez mais comum. De facto, no \u00faltimo relat\u00f3rio publicado pela ENISA (ENISA Landscape 2018)<\/a>, faz-se men\u00e7\u00e3o em v\u00e1rias ocasi\u00f5es a este tipo de amea\u00e7a. <\/p>\n

    Com o objetivo de evitar este tipo de ataques, o fundador da Tofino Eric Byres<\/strong>, em colabora\u00e7\u00e3o com o DHS (Department of Homeland Security), criou uma nova empresa chamada Adolus<\/a> que desenvolveu uma solu\u00e7\u00e3o denominada FACT (Framework for Analysis and Coordinated Trust).<\/a><\/p>\n

    Como funciona o FACT?<\/h4>\n

    De forma resumida, o FACT funciona assim:<\/p>\n

      \n
    1. Os fabricantes que desenvolvem software ou dispositivos que cont\u00eam firmware\/software subscrevem o servi\u00e7o aDolus<\/strong> (atrav\u00e9s da solu\u00e7\u00e3o FACT).<\/li>\n
    2. As empresas (utilizadores finais) que utilizam estes software\/dispositivos podem validar as corre\u00e7\u00f5es e atualiza\u00e7\u00f5es<\/strong> de software novos antes de os instalar em equipamentos cr\u00edticos.<\/li>\n<\/ol>\n

      Na figura seguinte, acess\u00edvel aqui,<\/a> resume-se como funciona o FACT.<\/p>\n

      \"\"<\/p>\n

      A)<\/u> Os \u201cVendors\u201d criam um Digital Fingerprint<\/u><\/em><\/strong><\/p>\n

      Os fabricantes certificados pela Adolus<\/strong> criam uma \u201cdigital fingerprint\u201d do software\/firmware leg\u00edtimo que desenvolveram. A transfer\u00eancia desta \u201cdigital fingerprint\u201d<\/strong> \u00e9 realizada atrav\u00e9s de uma comunica\u00e7\u00e3o encriptada para o servidor da Adolus. <\/p>\n

      \"\"<\/p>\n

      B) <\/u>O FACT verifica a autenticidade do firmware\/software<\/u><\/em><\/strong><\/p>\n

      Dentro do FACT<\/strong>, verifica-se a autenticidade dos arquivos remetidos e guarda-se no que se denomina \u201cTrust Repository\u201d.<\/strong><\/p>\n

      A partir do Trust Repository<\/strong>, procede-se \u00e0 an\u00e1lise e \u00e0 compreens\u00e3o aprofundada dos subcomponentes do software e se cont\u00e9m vulnerabilidades.<\/p>\n

      \"\"<\/p>\n

      C) O \u201cAsset Owner\u201d comprova a integridade do firmware\/software que pretende instalar.<\/em><\/strong><\/p>\n

      Dentro do FACT, o utilizador descarrega o firmware\/software que pretende incorporar\/atualizar no seu ambiente cr\u00edtico ou de produ\u00e7\u00e3o da forma habitual (DVD, download, ISO, etc.).
      Com o firmware\/software descarregado, acede ao FACT e, com a ferramenta cliente, cria a sua pr\u00f3pria \u201cdigital fingerprinting\u201d do referido firmware\/software.<\/p>\n

      D) O FACT realiza a compara\u00e7\u00e3o entre ambos os Digital Fingerprints<\/em><\/strong><\/p>\n

      O FACT compara a digital fingerprint<\/strong> do fabricante (localizada no Trust Repository) com o digital fingerprinting gerado pelo utilizador.
      Se coincidirem, o software\/firmware \u00e9 leg\u00edtimo<\/strong>; caso contr\u00e1rio, foi modificado ou alterado. Al\u00e9m disso, o FACT fornece uma pontua\u00e7\u00e3o do grau de seguran\u00e7a do firmware\/software, fornecendo uma an\u00e1lise das principais vulnerabilidades encontradas. <\/p>\n

      \"\"<\/p>\n

      Quer ver um exemplo?<\/h4>\n

      A seguir, podemos ver um exemplo de como se realiza este fluxo na Adolus.<\/strong><\/p>\n

        \n
      1. Um utilizador tem de atualizar o firmware de um PLC da Rockwell.<\/strong> Fornecem-lhe este ficheiro \u201cPN-85386.bin\u201d para o efeito. \u00c9 fi\u00e1vel? <\/li>\n<\/ol>\n

        \"\"<\/p>\n

        2. No FACT <\/strong>observa-se que o ficheiro possui um certificado emitido pelo fabricante.<\/p>\n

        \"\"<\/p>\n

        \"\"<\/p>\n

        3. No caso seguinte, observa-se que o firmware que se pretende analisar<\/strong> \u00e9 composto por subm\u00f3dulos que cont\u00eam vulnerabilidades espec\u00edficas, n\u00e3o sendo recomend\u00e1vel a sua instala\u00e7\u00e3o.<\/p>\n

        \"\"<\/p>\n

        \"\"<\/p>\n

        \"\"<\/p>\n

        Sem d\u00favida, as consultoras\/engenheiras contam com uma excelente solu\u00e7\u00e3o<\/strong> para garantir que o software\/firmware que \u00e9 implementado em ambientes cr\u00edticos n\u00e3o foi manipulado. Em paralelo, \u00e9 absolutamente necess\u00e1rio contar com um modelo de controlo no qual tenham sido concebidas e escritas pol\u00edticas e procedimentos espec\u00edficos que padronizem a forma de trabalhar quando for necess\u00e1rio atualizar ou incorporar novo software\/firmware em ambientes OT. <\/p>\n

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        \n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div> Foi em novembro de 2014, quando public\u00e1mos este artigo no qual explic\u00e1vamos como a APT Dragonfly tinha sido capaz de:Aceder \u00e0s \u00e1reas de download de firmware das empresas Mesa Imaging (fornecedor de c\u00e2maras utilizadas para vis\u00e3o guiada de ve\u00edculos em ambientes industriais), eWon e MB Connect (fornecedores de solu\u00e7\u00f5es para acesso remoto e telegest\u00e3o […]<\/p>\n","protected":false},"author":31,"featured_media":48610,"menu_order":0,"template":"","categories":[969],"tags":[],"arquitectura":[1838],"area":[],"sector":[],"experto":[203],"weborigen":[157],"productos-tax":[],"soluciones-tax":[],"marcas-tax":[],"coauthors":[],"class_list":["post-48599","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-ciberseguranca","arquitectura-ciberseguranca-industrial","experto-ciberseguranca-industrial-disponibilidade-total","weborigen-ciberseguridadlogitek-com"],"acf":[],"yoast_head":"\nComo evitar \u201cSupply Chain Attacks\u201d e garantir a integridade do firmware\/software instalado em ambientes OT \/ Cr\u00edticos<\/title>\n<meta name=\"description\" content=\"\u201cSupply Chain Attack\u201d \u00e9 cada vez mais comum: solu\u00e7\u00e3o para evitar e garantir a integridade do firmware\/software instalado em ambientes OT \/ Cr\u00edticos\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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