{"id":84601,"date":"2020-06-09T13:42:13","date_gmt":"2020-06-09T11:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-gnutls-pozvolyayushhaya-vozobnovit-seans-tls-1-3-bez-znaniya-klyucha"},"modified":"2020-06-09T13:42:13","modified_gmt":"2020-06-09T11:42:13","slug":"uyazvimost-v-gnutls-pozvolyayushhaya-vozobnovit-seans-tls-1-3-bez-znaniya-klyucha","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-gnutls-pozvolyayushhaya-vozobnovit-seans-tls-1-3-bez-znaniya-klyucha","title":{"rendered":"Zranitelnost v GnuTLS, kter\u00e1 umo\u017e\u0148uje obnovit relaci TLS 1.3 bez znalosti kl\u00ed\u010de.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V knihovn\u011b GnuTLS, kter\u00e1 se pou\u017e\u00edv\u00e1 ve v\u00fdchoz\u00edm nastaven\u00ed v mnoha bal\u00edc\u00edch Debianu, v\u010detn\u011b bal\u00ed\u010dkov\u00e9ho spr\u00e1vce APT a mnoha utilit, byla odhalena<\/a><\/noindex> zranitelnost<\/a><\/noindex> (CVE-2020-13777<\/a><\/noindex>), co\u017e umo\u017e\u0148uje obnovit d\u0159\u00edve zastavenou relaci TLS bez znalosti rel\u00e9ov\u00e9ho kl\u00ed\u010de. Z praktick\u00e9ho hlediska m\u016f\u017ee b\u00fdt zranitelnost vyu\u017eita k prov\u00e1d\u011bn\u00ed MITM \u00fatok\u016f. <\/p>\n

Zranitelnost je zp\u016fsobena nespr\u00e1vnou konstrukc\u00ed ticket-kl\u00ed\u010de relace \u2014 TLS server neprov\u00e1d\u011bl vazbu relace \u0161ifrovac\u00edho kl\u00ed\u010de na hodnotu p\u0159edanou aplikac\u00ed. A\u017e do prvn\u00ed rotace kl\u00ed\u010de TLS server p\u0159i generov\u00e1n\u00ed relace st\u00e1le pou\u017e\u00edv\u00e1 nespr\u00e1vn\u00e1 data m\u00edsto \u0161ifrovac\u00edho kl\u00ed\u010de z\u00edskan\u00e9ho od aplikace, co\u017e \u00fato\u010dn\u00edkovi umo\u017e\u0148uje obej\u00edt autentizaci v TLS 1.3 a obnovit minul\u00e9 relace v re\u017eimu TLS 1.2.<\/p>\n

Zranitelnost odstran\u011bna<\/a><\/noindex> v vyd\u00e1n\u00ed 3.6.14, ve kter\u00e9m byly tak\u00e9 vy\u0159e\u0161eny probl\u00e9my<\/a><\/noindex> probl\u00e9my se zpracov\u00e1n\u00edm k\u0159\u00ed\u017eov\u011b podepsan\u00fdch certifik\u00e1t\u016f, kter\u00e9 se objevily po zastar\u00e1n\u00ed ko\u0159enov\u00e9ho certifik\u00e1tu AddTrust. Probl\u00e9m se objevil od vyd\u00e1n\u00ed 3.6.4 (2018-09-24). V distribuc\u00edch byla zranitelnost odstran\u011bna v Debian<\/a><\/noindex>, SUSE<\/a><\/noindex>, FreeBSD<\/a><\/noindex>, Fedora<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, EPEL<\/a><\/noindex>, RHEL 8<\/a><\/noindex> (RHEL 6 a 7 vystaven\u00fd<\/a><\/noindex>).<\/p>\n

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

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

\u0412 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 GnuTLS, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u043f\u0430\u043a\u0435\u0442\u0430\u0445 \u0438\u0437 \u0441\u043e\u0441\u0442\u0430\u0432\u0430 Debian, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u0430\u043a\u0435\u0442\u043d\u044b\u0439 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440 APT \u0438 \u043c\u043d\u043e\u0433\u0438\u0435 \u0443\u0442\u0438\u043b\u0438\u0442\u044b, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-13777), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u043e\u0437\u043e\u0431\u043d\u043e\u0432\u0438\u0442\u044c \u0440\u0430\u043d\u0435\u0435 \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0439 \u0441\u0435\u0430\u043d\u0441 TLS \u0431\u0435\u0437 \u0437\u043d\u0430\u043d\u0438\u044f \u0441\u0435\u0441\u0441\u0438\u043e\u043d\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430. \u0421 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u0435\u043d\u0438\u044f MITM-\u0430\u0442\u0430\u043a. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u044b\u043c \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u0435\u043c \u0441\u0435\u0441\u0441\u0438\u043e\u043d\u043d\u043e\u0433\u043e ticket-\u043a\u043b\u044e\u0447\u0430 — TLS-\u0441\u0435\u0440\u0432\u0435\u0440 \u043d\u0435 \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u044f\u043b \u043f\u0440\u0438\u0432\u044f\u0437\u043a\u0443 \u0441\u0435\u0441\u0441\u0438\u043e\u043d\u043d\u043e\u0433\u043e \u043a\u043b\u044e\u0447\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-84601","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v GnuTLS, kter\u00e1 umo\u017e\u0148uje obnovit relaci TLS 1.3 bez znalosti kl\u00ed\u010de | 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