Az OpenSSH fejleszt\u0151i tov\u00e1bb folytatt\u00e1k az sshd t\u00f6bb k\u00fcl\u00f6n\u00e1ll\u00f3 futtathat\u00f3 f\u00e1jlra val\u00f3 feloszt\u00e1s\u00e1t. Az els\u0151 l\u00e9p\u00e9s sor\u00e1n, amely m\u00e1jusban val\u00f3sult meg, az sshd-b\u0151l egy k\u00fcl\u00f6n folyamatba, sshd-session-be ker\u00fcltek \u00e1t a munkamenetek kezel\u00e9s\u00e9vel kapcsolatos funkci\u00f3k, m\u00edg az sshd csak az \u00faj h\u00e1l\u00f3zati kapcsolat fogad\u00e1s\u00e1hoz \u00e9s az sshd-session elind\u00edt\u00e1s\u00e1hoz sz\u00fcks\u00e9ges funkcionalit\u00e1st hagyta meg az egyes \u00faj munkamenetekhez. Tegnap egy \u00faj fejleszt\u00e9st vezettek be az OpenSSH k\u00f3dalapj\u00e1ba, amely \u00fajabb folyamatot ad hozz\u00e1 \u2013 sshd-auth, amelyen bel\u00fcl az sshd-session-b\u00f3l \u00e1tvitt k\u00f3d v\u00e9gzi az autentik\u00e1ci\u00f3t. <\/p>\n
Az sshd-auth folyamat az sshd-session-b\u00f3l indul el, \u00e9s lehet\u0151v\u00e9 teszi az autentik\u00e1ci\u00f3val kapcsolatos adatok tov\u00e1bbi elszigetel\u00e9s\u00e9t egy k\u00fcl\u00f6n folyamat c\u00edmtartom\u00e1ny\u00e1ban, \u00edgy megel\u0151zve a hozz\u00e1f\u00e9r\u00e9st ezekhez az adatokhoz a mem\u00f3ri\u00e1ban, ha t\u00e1mad\u00e1s t\u00f6rt\u00e9nik a kapcsolat kezel\u00e9si szakaszait v\u00e9gz\u0151 k\u00f3dra. Ezenk\u00edv\u00fcl a m\u00f3dos\u00edt\u00e1s enyh\u00e9n cs\u00f6kkenti a mem\u00f3riafogyaszt\u00e1st, mivel az autentik\u00e1ci\u00f3val kapcsolatos k\u00f3d most csak az autentik\u00e1ci\u00f3 ideje alatt van a mem\u00f3ri\u00e1ban, majd az sshd-auth folyamat befejez\u00e9sekor ki\u00fcr\u00fcl. <\/p>\n
Hasonl\u00f3an az sshd-hez, az ssh-session-h\u00f6z \u00e9s az ssh-agenthez, a sshd-auth folyamat eset\u00e9ben is alkalmazt\u00e1k az futtathat\u00f3 f\u00e1jl v\u00e9letlenszer\u0171 \u00e1trendez\u00e9s\u00e9t minden oper\u00e1ci\u00f3s rendszer bet\u00f6lt\u00e9sekor. A v\u00e9letlenszer\u0171 \u00e1trendez\u00e9s miatt a funkci\u00f3k eltol\u00f3d\u00e1sa a futtathat\u00f3 f\u00e1jlokban \u00e9s k\u00f6nyvt\u00e1rakban nehezen megj\u00f3solhat\u00f3, ami megnehez\u00edti a visszafel\u00e9 orient\u00e1lt programoz\u00e1si m\u00f3dszereket (ROP \u2013 Return-Oriented Programming) alkalmaz\u00f3 exploitok l\u00e9trehoz\u00e1s\u00e1t. A ROP technika alkalmaz\u00e1sakor a t\u00e1mad\u00f3 nem pr\u00f3b\u00e1lja meg elhelyezni saj\u00e1t k\u00f3dj\u00e1t a mem\u00f3ri\u00e1ban, hanem a m\u00e1r megl\u00e9v\u0151 g\u00e9pi utas\u00edt\u00e1sok darabjaira hivatkozik, amelyek visszat\u00e9r\u00e9si utas\u00edt\u00e1sban v\u00e9gz\u0151dnek (ez \u00e1ltal\u00e1ban a funkci\u00f3k v\u00e9g\u00e9n tal\u00e1lhat\u00f3). Az exploit feladata egy l\u00e1nc \u00f6sszerak\u00e1sa az ilyen blokkok (\u201egadgets\u201d) h\u00edv\u00e1saival a sz\u00fcks\u00e9ges funkcionalit\u00e1s el\u00e9r\u00e9s\u00e9hez. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 OpenSSH \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0438\u043b\u0438 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 sshd \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u044b\u0445 \u0444\u0430\u0439\u043b\u043e\u0432. \u041d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u043c \u0432 \u043c\u0430\u0435 \u043f\u0435\u0440\u0432\u043e\u043c \u044d\u0442\u0430\u043f\u0435 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0438\u0437 sshd \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441 sshd-session \u0431\u044b\u043b\u0438 \u0432\u044b\u043d\u0435\u0441\u0435\u043d\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0435\u0430\u043d\u0441\u043e\u0432, \u0430 \u0432 sshd \u043e\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0430 \u043b\u0438\u0448\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u044c\u043d\u043e\u0441\u0442\u044c, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u0430\u044f \u0434\u043b\u044f \u043f\u0440\u0438\u0451\u043c\u0430 \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0442\u0435\u0432\u043e\u0433\u043e \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f \u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 sshd-session \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u043d\u043e\u0432\u043e\u0433\u043e \u0441\u0435\u0430\u043d\u0441\u0430. \u0412\u0447\u0435\u0440\u0430 \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 OpenSSH \u0431\u044b\u043b\u043e […]<\/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-120192","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\udd47 Az OpenSSH autentik\u00e1ci\u00f3s k\u00f3dja k\u00fcl\u00f6n folyamatba, az sshd-auth-ba ker\u00fclt | ProHoster","description":"Az OpenSSH fejleszt\u0151i folytatt\u00e1k az sshd sz\u00e9tv\u00e1laszt\u00e1s\u00e1t k\u00fcl\u00f6n\u00e1ll\u00f3 v\u00e9grehajtott 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Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"