{"id":123627,"date":"2025-04-22T09:05:07","date_gmt":"2025-04-22T07:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-udostoveryayushhem-czentre-ssl-com-pozvolyavshaya-poluchit-sertifikat-dlya-chuzhogo-domena"},"modified":"2025-04-22T09:05:07","modified_gmt":"2025-04-22T07:05:07","slug":"uyazvimost-v-udostoveryayushhem-czentre-ssl-com-pozvolyavshaya-poluchit-sertifikat-dlya-chuzhogo-domena","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-udostoveryayushhem-czentre-ssl-com-pozvolyavshaya-poluchit-sertifikat-dlya-chuzhogo-domena","title":{"rendered":"Zranitelnost v certifika\u010dn\u00edm centru SSL.com, kter\u00e1 umo\u017enila z\u00edskat certifik\u00e1t pro ciz\u00ed dom\u00e9nu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V certifika\u010dn\u00edm centru SSL.com byla zji\u0161t\u011bna zranitelnost v syst\u00e9mu ov\u011b\u0159ov\u00e1n\u00ed vlastnictv\u00ed dom\u00e9ny, kter\u00e1 umo\u017enila z\u00edskat TLS certifik\u00e1t pro jakoukoli dom\u00e9nu, pokud \u00fato\u010dn\u00edk poskytl e-mail. Pro z\u00edsk\u00e1n\u00ed TLS certifik\u00e1tu sta\u010dil p\u0159\u00edstup k e-mailu s c\u00edlovou dom\u00e9nou. Nap\u0159\u00edklad zranitelnost umo\u017enila z\u00edskat TLS certifik\u00e1t pro dom\u00e9ny pou\u017e\u00edvan\u00e9 v ve\u0159ejn\u00fdch e-mailov\u00fdch slu\u017eb\u00e1ch, jako jsou gmail.com, yandex.ru, yahoo.com, outlook.com a icloud.com. <\/p>\n

Zranitelnost rovn\u011b\u017e d\u00e1vala \u00fato\u010dn\u00edk\u016fm mo\u017enost prov\u00e1d\u011bt c\u00edlen\u00e9 \u00fatoky na zam\u011bstnance zn\u00e1m\u00fdch spole\u010dnost\u00ed a \u00fa\u010dastn\u00edky velk\u00fdch projekt\u016f za \u00fa\u010delem z\u00edsk\u00e1n\u00ed p\u0159\u00edstupu k jejich e-mail\u016fm a z\u00edsk\u00e1n\u00ed TLS certifik\u00e1t\u016f pro zn\u00e1m\u00e9. dom\u00e9n.<\/a>. Nap\u0159\u00edklad prolomen\u00ed zam\u011bstnance Google s e-mailem name@google.com umo\u017enilo z\u00edskat certifik\u00e1t pro dom\u00e9nu<\/a> google.com. <\/p>\n

Zranitelnost byla zp\u016fsobena chybou v implementaci syst\u00e9mu ov\u011b\u0159ov\u00e1n\u00ed vlastnictv\u00ed dom\u00e9ny prost\u0159ednictv\u00edm potvrzen\u00ed e-mailem. Pro z\u00edsk\u00e1n\u00ed potvrzen\u00ed e-mailem je nutn\u00e9 p\u0159idat do DNS z\u00f3ny dom\u00e9ny, pro kterou je \u017e\u00e1d\u00e1n certifik\u00e1t, DNS TXT z\u00e1znam \u201e_validation-contactemail\u201c. Nap\u0159\u00edklad: \u201e_validation-contactemail.test.com DNS TXT name@example.com\u201c. Po zah\u00e1jen\u00ed ov\u011b\u0159ov\u00e1n\u00ed dom\u00e9ny bude na e-mail name@examle.com zasl\u00e1n ov\u011b\u0159ovac\u00ed k\u00f3d, jeho\u017e zad\u00e1n\u00ed potvrd\u00ed vlastnictv\u00ed dom\u00e9ny \u201etest.com\u201c a umo\u017en\u00ed z\u00edskat TLS certifik\u00e1t pro \u201etest.com\u201c. <\/p>\n

Podstatou zranitelnosti je, \u017ee krom\u011b dom\u00e9ny \u201etest.com\u201c, pro kterou byl certifik\u00e1t po\u017eadov\u00e1n, byl p\u0159\u00edznak potvrzen\u00ed vlastnictv\u00ed tak\u00e9 vy\u017eadov\u00e1n pro dom\u00e9nu \u201eexample.com\u201c, pou\u017eitou v e-mailu. V\u011bdec, kter\u00fd probl\u00e9m odhalil, demonstroval z\u00edsk\u00e1n\u00ed funk\u010dn\u00edho TLS certifik\u00e1tu pro dom\u00e9nu aliyun.com, pou\u017e\u00edvanou v webmailov\u00e9m servisu \u010d\u00ednsk\u00e9 spole\u010dnosti Alibaba. B\u011bhem testovac\u00edho \u00fatoku v\u011bdec zaregistroval ov\u011b\u0159ovac\u00ed dom\u00e9nu \u201ed2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com\u201c ve slu\u017eb\u011b \u201edcv-inspector.com\u201c a po\u017e\u00e1dal pro ni o TLS certifik\u00e1t p\u0159id\u00e1n\u00edm DNS z\u00e1znamu: _validation-contactemail.d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com DNS TXT myusername@aliyun.com <\/p>\n

Pot\u00e9 po\u017e\u00e1dal na webu SSL.com o TLS certifik\u00e1t pro dom\u00e9nu d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com a zvolil potvrzen\u00ed e-mailem. Certifika\u010dn\u00ed autorita SSL.com zaslala ov\u011b\u0159ovac\u00ed k\u00f3d na myusername@aliyun.com a po zad\u00e1n\u00ed tohoto k\u00f3du p\u0159idala do seznamu ov\u011b\u0159en\u00fdch dom\u00e9n nejen \u201ed2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com\u201c, ale i \u201ealiyun.com\u201c. Po tomto kroku v\u011bdec \u00fasp\u011b\u0161n\u011b z\u00edskal TLS certifik\u00e1t pro dom\u00e9nu \u201ealiyun.com\u201c, jej\u00ed\u017e vlastnictv\u00ed bylo potvrzeno. <\/p>\n

Certifika\u010dn\u00ed autorita SSL.com vy\u0159e\u0161ila probl\u00e9m a odhalila 11 certifik\u00e1t\u016f, u kter\u00fdch byla pou\u017eita zraniteln\u00e1 verifika\u010dn\u00ed sch\u00e9ma s extern\u00ed dom\u00e9nou v e-mailu. P\u0159edpokl\u00e1d\u00e1 se, \u017ee u zji\u0161t\u011bn\u00fdch p\u0159\u00edpad\u016f nejsou p\u0159\u00edtomny \u017e\u00e1dn\u00e9 zn\u00e1mky \u0161kodliv\u00e9 \u010dinnosti a z 11 zat\u00edm byl odvol\u00e1n pouze jeden certifik\u00e1t, kter\u00fd badatel z\u00edskal pro web aliyun.com. U ostatn\u00edch certifik\u00e1t\u016f se objevily dom\u00e9ny medinet.ca, help.gurusoft.com.sg, banners.betvictor.com, production-boomi.3day.com, kisales.com a medc.kisales.com. Spole\u010dnost SSL.com m\u00e1 v \u00famyslu zve\u0159ejnit zpr\u00e1vu o incidentu do 2. kv\u011btna.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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