{"id":72877,"date":"2020-03-05T08:42:10","date_gmt":"2020-03-05T05:42:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/letsencrypt-planiruet-otozvat-svoi-sertifikaty-iz-za-programmnoj-oshibki"},"modified":"2020-03-05T08:42:10","modified_gmt":"2020-03-05T05:42:10","slug":"letsencrypt-planiruet-otozvat-svoi-sertifikaty-iz-za-programmnoj-oshibki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/administrirovanie\/letsencrypt-planiruet-otozvat-svoi-sertifikaty-iz-za-programmnoj-oshibki","title":{"rendered":"LetsEncrypt plans to revoke its certificates due to a software bug","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"LetsEncrypt
\nThe LetsEncrypt company, which offers free SSL certificates for encryption, is forced to revoke some certificates.<\/p>\n

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

The issue is related to a software bug<\/a><\/noindex> in the Boulder management software used for building the CA. Normally, the CAA DNS record check occurs simultaneously with domain ownership verification, and most subscribers receive a certificate immediately after the check, but the software developers made it so that the verification result is considered passed for the next 30 days. In some cases, a second check can be performed right before issuing the certificate, particularly needing a recheck of the CAA within 8 hours before issuance, so any domain verified before this period must be reverified.<\/p>\n

<\/p>\n

What is the error? If a certification request includes N domains requiring a recheck of the CAA \u2014 Boulder would choose one of them and check it N times. As a result, there was a possibility of issuing a certificate even if a CAA record prohibiting the issuance of LetsEncrypt certificates was set later (within X+30 days).<\/p>\n

<\/p>\n

To check certificates, the company has prepared an online tool<\/a><\/noindex>, which will provide a detailed report.<\/p>\n

<\/p>\n

Advanced users can do it all themselves using the following commands:<\/p>\n

<\/p>\n

# \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 https\nopenssl s_client -connect example.com:443 -showcerts <\/dev\/null 2>\/dev\/null | openssl x509 -text -noout | grep -A 1 Serial Number | tr -d :\n# \u0432\u0430\u0440\u0438\u0430\u043d\u0442 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043e\u0442 @simpleadmin \necho | openssl s_client -connect example.com:443 |& openssl x509 -noout -serial\n# \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430, \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b SMTP\nopenssl s_client -connect example.com:25 -starttls smtp -showcerts <\/dev\/null 2>\/dev\/null | openssl x509 -text -noout | grep -A 1 Serial Number | tr -d :\n# \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430, \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b SMTP\nopenssl s_client -connect example.com:587 -starttls smtp -showcerts <\/dev\/null 2>\/dev\/null | openssl x509 -text -noout | grep -A 1 Serial Number | tr -d :\n# \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430, \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b IMAP\nopenssl s_client -connect example.com:143 -starttls imap -showcerts <\/dev\/null 2>\/dev\/null | openssl x509 -text -noout | grep -A 1 Serial Number | tr -d :\n# \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u043f\u043e\u0447\u0442\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0440\u0432\u0435\u0440\u0430, \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b IMAP\nopenssl s_client -connect example.com:993 -showcerts <\/dev\/null 2>\/dev\/null | openssl x509 -text -noout | grep -A 1 Serial Number | tr -d :\n# \u0432 \u043f\u0440\u0438\u043d\u0446\u0438\u043f\u0435 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u043e \u043f\u0440\u043e\u0432\u0435\u0440\u044f\u044e\u0442\u0441\u044f \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u0435\u0440\u0432\u0438\u0441\u044b<\/code><\/pre>\n
<\/p>\n
Next, you need to check here<\/a><\/noindex> your serial number, and if it is in the list, it is recommended to update the certificate(s).<\/p>\n
<\/p>\n
To update certificates, you can use certbot:<\/p>\n
<\/p>\n
certbot renew --force-renewal<\/code><\/pre>\n
<\/p>\n
The problem was identified on February 29, 2020, and to resolve the issue, certificate issuance was suspended from 3:10 UTC to 5:22 UTC. According to an internal investigation, the error was introduced on July 25, 2019, and the company will provide a more detailed report later.<\/p>\n
<\/p>\n
UPD: the online certificate verification service may not work from Russian IP addresses.<\/p>\n
Source: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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