{"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\/da\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"Masse tilbagetr\u00e6kning af Let's Encrypt-certifikater","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Det non-profit certificeringscenter Let's Encrypt, der er drevet af f\u00e6llesskabet, tilbyder gratis certifikater til alle interesserede. advarer<\/a><\/noindex> om den kommende tilbagekaldelse af mange tidligere udstedte TLS\/SSL certifikater. Af de 116 millioner nuv\u00e6rende certifikater fra Let’s Encrypt vil lidt over 3 millioner (2,6%) blive tilbagekaldt, hvoraf cirka 1 million er duplikater knyttet til et dom\u00e6ne (fejlen p\u00e5virkede prim\u00e6rt certificeringer, der ofte blev opdateret, og derfor s\u00e5 mange duplikater). Tilbagekaldelsen er planlagt til den 4. marts (det pr\u00e6cise tidspunkt er ikke fastsat, men tilbagekaldelsen vil ikke finde sted f\u00f8r kl. 3 om natten MSK).<\/p>\n

Behovet for tilbagetr\u00e6kningen udl\u00f8ses af en opdaget fejl<\/a><\/noindex>. Problemet har vist sig siden den 25. juli 2019 og p\u00e5virker systemet til kontrol af CAA-registrer i DNS. CAA-posten (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) giver dom\u00e6neejeren mulighed for at definere, hvilken certificeringsmyndighed der kan generere certifikater for det angivne dom\u00e6ne. Hvis certificeringsmyndigheden ikke er n\u00e6vnt i CAA-optegnelserne, skal den forhindre udstedelse af certifikater for dette dom\u00e6ne og informere dom\u00e6neejeren om fors\u00f8g p\u00e5 kompromittering. I de fleste tilf\u00e6lde anmodes der om certifikatet umiddelbart efter best\u00e5et CAA-kontrol, men kontrolresultatet anses for gyldigt i 30 dage. Reglerne foreskriver ogs\u00e5, at en ny kontrol skal udf\u00f8res senest 8 timer f\u00f8r udstedelse af et nyt certifikat (dvs. hvis der er g\u00e5et 8 timer siden sidste kontrol ved anmodning om et nyt certifikat, kr\u00e6ves der en ny kontrol).<\/p>\n

Fejlen opst\u00e5r, hvis anmodningen om certifikat d\u00e6kker flere dom\u00e6nenavne, for hvilke hver is\u00e6r kr\u00e6ver kontrol af CAA-poster. Problematikken ligger i, at ved en gentagen kontrol i stedet for at validere alle dom\u00e6ner, blev der kun udf\u00f8rt gentagen kontrol af \u00e9t dom\u00e6ne fra listen (hvis anmodningen indeholdt N dom\u00e6ner, blev \u00e9t dom\u00e6ne kontrolleret N gange i stedet for N forskellige kontroller). For de andre dom\u00e6ner blev den gentagne kontrol ikke udf\u00f8rt, og ved beslutningstagning blev der anvendt data fra den f\u00f8rste kontrol (dvs. data, der kunne v\u00e6re op til 30 dage gamle). Som f\u00f8lge heraf kunne Let’s Encrypt i l\u00f8bet af 30 dage efter den f\u00f8rste kontrol udstede et certifikat, selvom v\u00e6rdien af CAA-posten var \u00e6ndret, og Let’s Encrypt var blevet fjernet fra listen over godkendte certifikatudbydere.<\/p>\n

Brugere, der er ramt af problemet, har modtaget en email-notifikation, hvis der blev indtastet kontaktoplysninger ved modtagelsen af certifikatet. Du kan tjekke dine certifikater ved at uploade liste<\/a><\/noindex> serienumre for tilbagekaldte certifikater eller ved at bruge den online tjeneste<\/a><\/noindex> (hostet p\u00e5 IP-adressen, som er blokeret<\/a><\/noindex> af Roskomnadzor i Rusland). Du kan finde serienummeret for certifikatet for det \u00f8nskede dom\u00e6ne ved hj\u00e6lp af kommandoen:<\/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

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

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