{"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\/pl\/blog\/news\/uyazvimost-v-udostoveryayushhem-czentre-ssl-com-pozvolyavshaya-poluchit-sertifikat-dlya-chuzhogo-domena","title":{"rendered":"Vulnerability in the SSL.com certification authority that allowed obtaining a certificate for someone else's domain","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W centrum certyfikacji SSL.com odkryto luk\u0119 w systemie weryfikacji w\u0142asno\u015bci domeny, kt\u00f3ra umo\u017cliwia\u0142a uzyskanie certyfikatu TLS dla dowolnej domeny, pod warunkiem podania atakuj\u0105cemu adresu email. Do uzyskania certyfikatu TLS wystarczy\u0142 dost\u0119p do emaila z docelow\u0105 domen\u0105. Na przyk\u0142ad, luka ta umo\u017cliwia\u0142a uzyskanie certyfikatu TLS dla domen u\u017cywanych w publicznych us\u0142ugach emailowych, takich jak gmail.com, yandex.ru, yahoo.com, outlook.com i icloud.com. <\/p>\n

Luka ta dawa\u0142a r\u00f3wnie\u017c przest\u0119pcom mo\u017cliwo\u015b\u0107 przeprowadzania celowych atak\u00f3w na pracownik\u00f3w znanych firm i uczestnik\u00f3w du\u017cych projekt\u00f3w w celu zdobycia dost\u0119pu do ich emaili i uzyskania certyfikat\u00f3w TLS dla znanych. domen\u00f3w<\/a>. Na przyk\u0142ad, w\u0142amanie do pracownika Google, maj\u0105cego email name@google.com, umo\u017cliwia\u0142o uzyskanie certyfikatu dla domeny<\/a> google.com. <\/p>\n

Vulnerability was caused by an error in the implementation of the domain ownership verification system via email confirmation. To receive email confirmation, you need to add a DNS TXT record to the DNS zone of the domain for which the certificate is requested, such as \u2018_validation-contactemail\u2019. For example, \u2018_validation-contactemail.test.com DNS TXT name@example.com\u2019. After initiating the domain verification, a confirmation code will be sent to the email name@example.com, entering which confirms ownership of the domain \u2018test.com\u2019 and allows obtaining a TLS certificate for \u2018test.com\u2019. <\/p>\n

The essence of the vulnerability is that in addition to the domain \u2018test.com\u2019 for which the certificate was requested, the ownership confirmation attribute was also set for the domain \u2018example.com\u2019 used in the email. The researcher who identified the issue demonstrated the acquisition of a working TLS certificate for the domain aliyun.com, used in the webmail service of the Chinese company Alibaba. During a test attack, the researcher registered a verification domain \u2018d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com\u2019 in the service \u2018dcv-inspector.com\u2019 and requested a TLS certificate for it by adding the DNS record: _validation-contactemail.d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com DNS TXT myusername@aliyun.com <\/p>\n

After this, he requested a TLS certificate for the domain d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com on the SSL.com website and chose email confirmation. The SSL.com certificate authority sent a verification code to myusername@aliyun.com, and after entering that code, he added not only \u2018d2b4eee07de5efcb8598f0586cbf2690.test.dcv-inspector.com\u2019 to the list of verified domains but also \u2018aliyun.com\u2019. After this, the researcher successfully obtained a TLS certificate for the domain \u2018aliyun.com\u2019, ownership of which was confirmed. <\/p>\n

Centrum certyfikacji SSL.com usun\u0119\u0142o problem i zidentyfikowa\u0142o 11 certyfikat\u00f3w, przy wydawaniu kt\u00f3rych zastosowano podatny schemat weryfikacji z u\u017cyciem zewn\u0119trznej domeny w e-mailu. Domniemywa si\u0119, \u017ce w przypadkach, kt\u00f3re zidentyfikowano, nie wida\u0107 oznak dzia\u0142alno\u015bci z\u0142o\u015bliwej, a spo\u015br\u00f3d 11 dotychczas cofni\u0119ty zosta\u0142 tylko jeden certyfikat, kt\u00f3ry zosta\u0142 uzyskany przez badacza dla strony aliyun.com. W pozosta\u0142ych certyfikatach wyst\u0119powa\u0142y domeny medinet.ca, help.gurusoft.com.sg, banners.betvictor.com, production-boomi.3day.com, kisales.com oraz medc.kisales.com. Raport o incydencie firma SSL.com zamierza opublikowa\u0107 do 2 maja.
\n
\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0443\u0434\u043e\u0441\u0442\u043e\u0432\u0435\u0440\u044f\u044e\u0449\u0435\u043c \u0446\u0435\u043d\u0442\u0440\u0435 SSL.com \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0432\u043b\u0430\u0434\u0435\u043d\u0438\u044f \u0434\u043e\u043c\u0435\u043d\u043e\u043c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0432\u0448\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c TLS-\u0441\u0435\u0440\u0442\u0438\u0444\u0438\u043a\u0430\u0442 \u0434\u043b\u044f \u043b\u044e\u0431\u043e\u0433\u043e \u0434\u043e\u043c\u0435\u043d\u0430, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u0438\u0432\u0448\u0435\u0433\u043e email \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0435\u043c\u0443. \u0414\u043b\u044f \u043f\u043e\u043b\u0443\u0447\u0435\u043d\u0438\u044f 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