{"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\/ro\/blog\/news\/uyazvimost-v-openssl-i-libressl-privodyashhaya-k-zacziklivaniyu-pri-obrabotke-nekorrektnyh-sertifikatov","title":{"rendered":"O vulnerabilitate \u00een OpenSSL \u0219i LibreSSL, care duce la blocaje atunci c\u00e2nd se proceseaz\u0103 certificate incorecte","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Sunt disponibile versiuni corective ale bibliotecii criptografice OpenSSL 3.0.2 \u0219i 1.1.1n. \u00cen actualizare a fost remediat\u0103 vulnerabilitatea (CVE-2022-0778), care poate fi utilizat\u0103 pentru a cauza un atac de tip deny of service (blocare infinit\u0103 a procesului). Pentru a explora vulnerabilitatea, este suficient s\u0103 se reu\u0219easc\u0103 procesarea unui certificat format special. Problema apare at\u00e2t \u00een aplica\u021biile de server, c\u00e2t \u0219i \u00een cele client, care pot procesa certificate trimise de utilizatori. <\/p>\n

Problema este generat\u0103 de o eroare \u00een func\u021bia BN_mod_sqrt(), care duce la blocaje atunci c\u00e2nd se calculeaz\u0103 r\u0103d\u0103cina p\u0103trat\u0103 \u00een raport cu un modul diferit de un num\u0103r prim. Func\u021bia este utilizat\u0103 pentru analiza certificatelor cu chei bazate pe curbe eliptice. Exploatarea const\u0103 \u00een inserarea de parametri incorec\u021bi ai curbei eliptice \u00een certificat. Deoarece problema se manifest\u0103 \u00een stadiul anterior verific\u0103rii semn\u0103turii digitale a certificatului, atacul poate fi efectuat de un utilizator neautentificat care reu\u0219e\u0219te s\u0103 transmit\u0103 un certificat client sau server c\u0103tre aplica\u021biile care utilizeaz\u0103 OpenSSL. <\/p>\n

Vulnerabilitatea afecteaz\u0103 de asemenea biblioteca LibreSSL dezvoltat\u0103 de proiectul OpenBSD, pentru care au fost propuse remedieri \u00een versiunile corective LibreSSL 3.3.6, 3.4.3 \u0219i 3.5.1. De asemenea, a fost publicat\u0103 o analiz\u0103 a condi\u021biilor pentru exploatarea vulnerabilit\u0103\u021bii (exemplul unui certificat r\u0103u inten\u021bionat care provoac\u0103 blocarea nu a fost publicat \u00eenc\u0103).
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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