{"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\/sl\/blog\/news\/massovyj-otzyv-sertifikatov-lets-encrypt","title":{"rendered":"Masovni povla\u010denje sertifikata Let's Encrypt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Neprofitni certifikacijski organ Let’s Encrypt, ki ga upravlja skupnost in brezpla\u010dno izdaja certifikate vsem zainteresiranim, upozorio<\/a><\/noindex> o predvidenem umiku mnogih prej izdanih TLS\/SSL certifikatov. Od 116 milijonov trenutno veljavnih certifikatov Let’s Encrypt bo umaknjenih nekaj ve\u010d kot 3 milijone (2,6 %), od katerih je pribli\u017eno 1 milijon podvojenih, povezanih z enim samim domeno (napaka je predvsem prizadela zelo pogosto posodobljene certifikate, zato je toliko podvojenih). Umik je predviden za 4. marec (natan\u010den \u010das \u0161e ni dolo\u010den, vendar umik ne bo izveden prej kot ob 3. uri po moskovskem \u010dasu).<\/p>\n

Potrebnost povla\u010denja proiza\u0161la je iz otkrivene 29. velja\u010de gre\u0161ke<\/a><\/noindex>. Problem se manifestira od 25. srpnja 2019. godine i poga\u0111a sustav provjere CAA zapisa u DNS-u. CAA zapis (RFC-6844<\/a><\/noindex>, Certificate Authority Authorization) omogu\u0107uje vlasniku domene da jasno odredi certifikacijski organ preko kojeg se mogu generirati certifikati za navedenu domenu. Ako certifikacijski organ nije naveden u CAA zapisima, obvezan je blokirati izdavanje certifikata za tu domenu i obavijestiti vlasnika domene o poku\u0161ajima kompromitacije. U ve\u0107ini slu\u010dajeva certifikat se zahtijeva odmah nakon prolaska provjere CAA, ali rezultat provjere smatra se va\u017ee\u0107im jo\u0161 30 dana. Pravila tako\u0111er propisuju da se mora izvr\u0161iti ponovna provjera najkasnije 8 sati prije izdavanja novog certifikata (tj. ako je od pro\u0161le provjere proteklo 8 sati prilikom zahtjeva za novim certifikatom, potrebna je ponovna provjera).<\/p>\n

Napaka se pojavi, \u010de zahteva za certifikat zajema ve\u010d domen, za katere je potrebna preveritev CAA zapisa. Bistvo napake je v tem, da je ob ponovnem preverjanju namesto validacije vseh domen potekalo ponovno preverjanje samo ene domene s seznama (\u010de je bilo v zahtevi N domen, je bila ena domena preverjena N-krat). Za preostale domene ponovno preverjanje ni bilo izvedeno in pri odlo\u010danju so bili uporabljeni podatki prvega preverjanja (tj. uporabljeni so bili podatki, stari do 30 dni). Kot posledica je Let’s Encrypt lahko v 30 dneh po prvem preverjanju izdal certifikat, \u010deprav je bila vrednost CAA-zapisa spremenjena in je bil Let’s Encrypt odstranjen s seznama dovoljenih certifikacijskih organov.<\/p>\n

Uporabniki, ki so bili izpostavljeni te\u017eavi, so prejeli obvestilo po elektronski po\u0161ti, \u010de so ob prejemu potrdila izpolnili kontaktne podatke. Svoje certifikate lahko preverite s prenosom seznam<\/a><\/noindex> serijskih \u0161tevilk umaknjenih potrdil ali z uporabo spletne storitve<\/a><\/noindex> (ki je obrisana na IP naslovu, blokiranem<\/a><\/noindex> v RF s strani Roskomnadzorja). Serijsko \u0161tevilko potrdila za \u017eeleno domeno lahko izveste s pomo\u010djo ukaza:<\/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

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

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