{"id":103550,"date":"2022-03-16T15:36:49","date_gmt":"2022-03-16T13:36:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openssl-i-libressl-privodyashhaya-k-zacziklivaniyu-pri-obrabotke-nekorrektnyh-sertifikatov"},"modified":"2022-03-16T15:36:49","modified_gmt":"2022-03-16T13:36:49","slug":"uyazvimost-v-openssl-i-libressl-privodyashhaya-k-zacziklivaniyu-pri-obrabotke-nekorrektnyh-sertifikatov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-openssl-i-libressl-privodyashhaya-k-zacziklivaniyu-pri-obrabotke-nekorrektnyh-sertifikatov","title":{"rendered":"Zranitelnost v OpenSSL a LibreSSL, vedouc\u00ed k cyklen\u00ed p\u0159i zpracov\u00e1n\u00ed nekorektn\u00edch certifik\u00e1t\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Jsou k dispozici opravn\u00e9 verze kryptografick\u00e9 knihovny OpenSSL 3.0.2 a 1.1.1n. V aktualizaci byla odstran\u011bna zranitelnost (CVE-2022-0778), kter\u00e1 m\u016f\u017ee b\u00fdt zneu\u017eita k dosa\u017een\u00ed \u00fatoku typu DoS (neust\u00e1l\u00e9 cyklen\u00ed zpracovatele). K vyu\u017eit\u00ed t\u00e9to zranitelnosti sta\u010d\u00ed poskytnout speci\u00e1ln\u011b vytvo\u0159en\u00fd certifik\u00e1t. Probl\u00e9m se objevuje jak v serverov\u00fdch, tak v klientsk\u00fdch aplikac\u00edch, kter\u00e9 mohou zpracov\u00e1vat u\u017eivatelsky p\u0159ed\u00e1van\u00e9 certifik\u00e1ty. <\/p>\n

Probl\u00e9m je zp\u016fsoben chybou ve funkci BN_mod_sqrt(), kter\u00e1 vede k cyklen\u00ed p\u0159i v\u00fdpo\u010dtu druh\u00e9 odmocniny modulo, kter\u00e9 nen\u00ed prvo\u010d\u00edslem. Tato funkce se pou\u017e\u00edv\u00e1 p\u0159i anal\u00fdze certifik\u00e1t\u016f s kl\u00ed\u010di zalo\u017een\u00fdmi na elliptick\u00fdch k\u0159ivk\u00e1ch. Zneu\u017eit\u00ed spo\u010d\u00edv\u00e1 v podlo\u017een\u00ed neplatn\u00fdch parametr\u016f elliptick\u00e9 k\u0159ivky do certifik\u00e1tu. Proto\u017ee se probl\u00e9m projev\u00ed u\u017e ve f\u00e1zi p\u0159ed ov\u011b\u0159en\u00edm digit\u00e1ln\u00edho podpisu certifik\u00e1tu, \u00fatok m\u016f\u017ee prov\u00e9st neautentizovan\u00fd u\u017eivatel, schopn\u00fd zajistit p\u0159ed\u00e1n\u00ed klientsk\u00e9ho nebo serverov\u00e9ho certifik\u00e1tu do aplikac\u00ed vyu\u017e\u00edvaj\u00edc\u00edch OpenSSL. <\/p>\n

Zranitelnost se tak\u00e9 dot\u00fdk\u00e1 vyv\u00edjen\u00e9 knihovny LibreSSL projektu OpenBSD, pro kterou bylo navr\u017eeno opraven\u00ed v oprav\u00e1ch LibreSSL 3.3.6, 3.4.3 a 3.5.1. D\u00e1le byl zve\u0159ejn\u011bn p\u0159ehled podm\u00ednek pro zneu\u017eit\u00ed zranitelnosti (p\u0159\u00edklad \u0161kodliv\u00e9ho certifik\u00e1tu, kter\u00fd zp\u016fsobuje zamrznut\u00ed, zat\u00edm nebyl zve\u0159ejn\u011bn ve\u0159ejn\u011b).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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