{"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\/en\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"According to the previously established plan, the set of GCC compilers","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Let's Encrypt is a community-controlled, nonprofit certificate authority that provides certificates free of charge to anyone who wants them. warned<\/a><\/noindex> about the upcoming revocation of many previously issued TLS\/SSL certificates. Out of 116 million currently active certificates from Let's Encrypt, just over 3 million (2.6%) will be revoked, of which approximately 1 million are duplicates tied to a single domain (the error primarily affected frequently updated certificates, leading to such a high number of duplicates). The revocation is scheduled for March 4 (exact time has not yet been determined, but it will not occur before 3 AM MSK).<\/p>\n

The need for revocation is due to the issue identified on February 29 error<\/a><\/noindex>. The problem has been present since July 25, 2019, and affects the CAA record validation system in DNS. A CAA record (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) allows a domain owner to explicitly specify the certificate authority through which certificates for the specified domain can be generated. If the certificate authority is not listed in the CAA records, it must block the issuance of certificates for that domain and notify the domain owner of any compromise attempts. In most cases, a certificate is requested right after passing the CAA check, but the verification result is considered valid for an additional 30 days. The rules also stipulate that a recheck must be performed no later than 8 hours before the issuance of a new certificate (i.e., if 8 hours have passed since the last check when requesting a new certificate, a recheck is required).<\/p>\n

The error occurs when a certificate request covers multiple domain names, each of which requires a CAA record validation. The essence of the error is that during the revalidation, instead of validating all domains, only one domain from the list was rechecked (if the request contained N domains, instead of N different checks, one domain was checked N times). For the other domains, no revalidation was performed, and the data from the first validation was used in the decision (i.e., data up to 30 days old was used). As a result, within 30 days after the first validation, Let's Encrypt could issue a certificate even if the CAA record value was changed and Let's Encrypt was removed from the list of allowed certification authorities.<\/p>\n

Users affected by the issue have been notified via email if contact details were provided when obtaining the certificate. You can check your certificates by uploading list<\/a><\/noindex> serial numbers of revoked certificates or using the online service<\/a><\/noindex> (hosted on an IP address, blocked<\/a><\/noindex> by Roskomnadzor in Russia). You can find the serial number of the certificate for the domain of interest using the command:<\/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

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

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