{"id":101115,"date":"2021-08-28T10:22:53","date_gmt":"2021-08-28T08:22:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libssh-privodyashhaya-k-perepolneniyu-bufera"},"modified":"2021-08-28T10:22:53","modified_gmt":"2021-08-28T08:22:53","slug":"uyazvimost-v-libssh-privodyashhaya-k-perepolneniyu-bufera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-libssh-privodyashhaya-k-perepolneniyu-bufera","title":{"rendered":"Haavatavus libssh-is, mis viib vahem\u00e4lu \u00fcletamiseni","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Libssh teeg p\u00fchendatud SSHv2 protokolli kliendi- ja serveritoe lisamisele C keeles on avastatud haavatavus (CVE-2021-3634), mis p\u00f5hjustab puhver\u00fclevoolu v\u00f5tme muutmise protsessi (rekey) algatamisel, kui kasutatakse v\u00f5tme vahetamise mehhanismi, millel on erinev hash-algoritm. Probleem on lahendatud versioonis 0.9.6. <\/p>\n

Probleemi tuum on see, et v\u00f5tmevahetuse operatsioon lubab rakendada kr\u00fcptograafilisi h\u00e4she, mille v\u00e4ljund suurus erineb algselt kasutatud algoritmist. Sel juhul eraldatakse libssh-s m\u00e4lu h\u00e4she jaoks l\u00e4htudes algsest h\u00e4she suurusest ja suurema suurusega h\u00e4she kasutamine viib andmete \u00fclekirjutamiseni eraldatud puhvri piiridest v\u00e4ljaspool. Varu kaitsemeetodina saab piirata toetatud v\u00f5tmevahetusmeetodite loendit ainult algoritmidega, millel on sama h\u00e4she suurus. N\u00e4iteks SHA256-sse seondumiseks saab koodi lisada: rc = ssh_options_set(s->ssh.session, SSH_OPTIONS_KEY_EXCHANGE, \"diffie-hellman-group14-sha256,curve25519-sha256,ecdh-sha2-nistp256\");
\n
Allikas: 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 libssh (\u043d\u0435 \u043f\u0443\u0442\u0430\u0442\u044c \u0441 libssh2), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0439 \u0434\u043b\u044f \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u043e\u0439 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u043e\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SSHv2 \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3634), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044e \u0431\u0443\u0444\u0435\u0440\u0430 \u043f\u0440\u0438 \u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0438 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u0441\u043c\u0435\u043d\u044b \u043a\u043b\u044e\u0447\u0430 (rekey) \u0441 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435\u043c \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u043e\u0431\u043c\u0435\u043d\u0430 \u043a\u043b\u044e\u0447\u0430\u043c\u0438, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0435\u0433\u043e \u0434\u0440\u0443\u0433\u043e\u0439 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c \u0445\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u0432\u044b\u043f\u0443\u0441\u043a\u0435 0.9.6. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u044f \u0441\u043c\u0435\u043d\u044b […]<\/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-101115","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\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\udd47Libssh haavatavus, mis p\u00f5hjustab puhver\u00fclevoolu | ProHoster","description":"Libssh teeg p\u00fchendatud SSHv2 protokolli kliendi- ja serveritoe lisamisele C keeles on avastatud haavatavus (CVE-2021-3634), mis p\u00f5hjustab 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(\u043d\u0435 \u043f\u0443\u0442\u0430\u0442\u044c \u0441 libssh2), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0439 \u0434\u043b\u044f \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043a\u043b\u0438\u0435\u043d\u0442\u0441\u043a\u043e\u0439 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u043e\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430 SSHv2 \u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2021-3634), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a 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