{"id":72754,"date":"2020-03-04T02:42:36","date_gmt":"2020-03-03T23:42:36","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/massovyj-otzyv-sertifikatov-lets-encrypt"},"modified":"2020-03-04T02:42:36","modified_gmt":"2020-03-03T23:42:36","slug":"massovyj-otzyv-sertifikatov-lets-encrypt","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"Revoga\u00e7\u00e3o em massa dos certificados Let's Encrypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A Let’s Encrypt \u00e9 uma autoridade certificadora sem fins lucrativos, controlada pela comunidade, que oferece certificados gratuitamente a todos os interessados. alertou<\/a><\/noindex> sobre a pr\u00f3xima revoga\u00e7\u00e3o de muitos certificados TLS\/SSL emitidos anteriormente. Dos 116 milh\u00f5es de certificados atualmente v\u00e1lidos, pouco mais de 3 milh\u00f5es (2,6%) do Let’s Encrypt ser\u00e3o revogados, dos quais cerca de 1 milh\u00e3o s\u00e3o duplicatas vinculadas a um \u00fanico dom\u00ednio (o erro impactou principalmente certificados que s\u00e3o frequentemente atualizados, resultando em muitas duplicatas). A revoga\u00e7\u00e3o est\u00e1 programada para 4 de mar\u00e7o (o hor\u00e1rio exato ainda n\u00e3o foi definido, mas a revoga\u00e7\u00e3o n\u00e3o ocorrer\u00e1 antes das 3 da manh\u00e3 MSK).<\/p>\n

A necessidade da revoga\u00e7\u00e3o \u00e9 decorrente de um erro identificado em 29 de fevereiro erro<\/a><\/noindex>. O problema se manifestou desde 25 de julho de 2019 e afeta o sistema de verifica\u00e7\u00e3o de registros CAA no DNS. O registro CAA (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) permite que o propriet\u00e1rio do dom\u00ednio defina explicitamente a autoridade certificadora atrav\u00e9s da qual os certificados para o dom\u00ednio indicado podem ser gerados. Se a autoridade certificadora n\u00e3o estiver listada nos registros CAA, ela deve bloquear a emiss\u00e3o de certificados para aquele dom\u00ednio e informar o propriet\u00e1rio sobre tentativas de comprometimento. Na maioria dos casos, o certificado \u00e9 solicitado imediatamente ap\u00f3s a verifica\u00e7\u00e3o CAA, mas o resultado da verifica\u00e7\u00e3o \u00e9 considerado v\u00e1lido por mais 30 dias. As regras tamb\u00e9m exigem que uma nova verifica\u00e7\u00e3o seja realizada no m\u00e1ximo 8 horas antes da emiss\u00e3o de um novo certificado (ou seja, se ao solicitar um novo certificado j\u00e1 tiver passado 8 horas desde a \u00faltima verifica\u00e7\u00e3o, uma nova verifica\u00e7\u00e3o \u00e9 necess\u00e1ria).<\/p>\n

O erro ocorre se a solicita\u00e7\u00e3o do certificado abrange v\u00e1rios nomes de dom\u00ednio, para os quais cada um requer uma verifica\u00e7\u00e3o do registro CAA. A ess\u00eancia do erro \u00e9 que, no momento da rechecagem, ao inv\u00e9s de validar todos os dom\u00ednios, apenas um dom\u00ednio da lista era verificado repetidamente (se a solicita\u00e7\u00e3o tinha N dom\u00ednios, ao inv\u00e9s de N checagens diferentes, um dom\u00ednio era verificado N vezes). Para os outros dom\u00ednios, a rechecagem n\u00e3o era realizada e, ao tomar a decis\u00e3o, eram utilizados os dados da primeira verifica\u00e7\u00e3o (ou seja, foram usados dados com at\u00e9 30 dias de idade). Como consequ\u00eancia, durante 30 dias ap\u00f3s a primeira verifica\u00e7\u00e3o, o Let’s Encrypt poderia emitir um certificado, mesmo se o valor do registro CAA tivesse sido alterado e o Let’s Encrypt removido da lista de autoridades certificadoras permitidas.<\/p>\n

Os usu\u00e1rios afetados foram notificados por e-mail, caso tenham preenchido os dados de contato ao receber o certificado. Voc\u00ea pode verificar seus certificados fazendo o download uma lista<\/a><\/noindex> dos n\u00fameros de s\u00e9rie dos certificados revogados ou utilizando o servi\u00e7o online<\/a><\/noindex> (hospedado no endere\u00e7o IP, bloqueado<\/a><\/noindex> pelo Roskomnadzor na R\u00fassia). Para descobrir o n\u00famero de s\u00e9rie do certificado para o dom\u00ednio desejado, voc\u00ea pode usar o comando:<\/p>\n

openssl s_client -connect example.com:443 -showcerts \/dev\/null \\
\n | openssl x509 -text -noout | grep -A 1 Serial\\ Number | tr -d :<\/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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