{"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\/et\/blog\/news\/uyazvimost-v-openssl-i-libressl-privodyashhaya-k-zacziklivaniyu-pri-obrabotke-nekorrektnyh-sertifikatov","title":{"rendered":"OpenSSL-i ja LibreSSL-i haavatavus, mis p\u00f5hjustab l\u00f5pmatuse ringi vale sertifikaatide t\u00f6\u00f6tlemisel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Saadaval on OpenSSL 3.0.2 ja 1.1.1n kr\u00fcptograafilise teegi parandavad v\u00e4ljaanded. Uuenduses on eemaldatud haavatavus (CVE-2022-0778), mida saab kasutada teenuse keelamise r\u00fcnnaku korraldamiseks (l\u00f5putu t\u00f6\u00f6tleja ts\u00fckkel). Haavatavuse \u00e4rakasutamiseks piisab, kui saada k\u00e4ideldud spetsiaalselt vormindatud sertifikaat. Probleem ilmneb nii serveri- kui ka kliendirakendustes, mis v\u00f5ivad t\u00f6\u00f6tada kasutajalt edastatud sertifikaatidega. <\/p>\n

Probleem on p\u00f5hjustatud veast funktsioonis BN_mod_sqrt(), mis p\u00f5hjustab l\u00f5putu ts\u00fckli, kui arvutatakse ruutjuurt modulaarselt, mittesoojendatavast arvust. Funktsiooni kasutatakse sertifikaatide, mille v\u00f5tmed p\u00f5hinevad elipsikurvidel, anal\u00fc\u00fcsimisel. Haavatavuse \u00e4rakasutamine h\u00f5lmab vale elipsikurvi parameetrite paigaldamist sertifikaati. Kuna probleem ilmneb enne sertifikaadi digitaalse allkirja kontrollimist, saab r\u00fcnnaku l\u00e4bi viia autentimata kasutaja, kes suudab edastada kliendi- v\u00f5i serverisertifikaadi rakendustesse, mis kasutavad OpenSSL-i. <\/p>\n

Haavatavus m\u00f5jutab ka OpenBSD projekti arendatavat LibreSSL raamatukogu, mille parandused on saadaval LibreSSL versioonides 3.3.6, 3.4.3 ja 3.5.1. Lisaks on avaldatud \u00fclevaade haavatavuse kuritarvitamiseks vajalikest tingimustest (n\u00e4iteks kahjuliku sertifikaadi n\u00e4ide, mis p\u00f5hjustab s\u00fcsteemi hangumise, pole siiski avalikult k\u00e4ttesaadav).
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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