{"id":117137,"date":"2024-07-09T15:43:01","date_gmt":"2024-07-09T13:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-paketah-s-openssh-iz-sostava-rhel-9-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-07-09T15:43:01","modified_gmt":"2024-07-09T13:43:01","slug":"uyazvimost-v-paketah-s-openssh-iz-sostava-rhel-9-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-paketah-s-openssh-iz-sostava-rhel-9-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Az OpenSSH RHEL 9 csomagjaiban tal\u00e1lhat\u00f3 sebezhet\u0151s\u00e9g, amely t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st tesz lehet\u0151v\u00e9","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A tanulm\u00e1nyozott OpenSSH legut\u00f3bb felfedezett kritikus sebezhet\u0151s\u00e9g\u00e9nek vizsg\u00e1lata sor\u00e1n \u00fajabb hasonl\u00f3 sebezhet\u0151s\u00e9g (CVE-2024-6409) bukkant fel, amely lehet\u0151v\u00e9 teszi a t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st an\u00e9lk\u00fcl, hogy az azonos\u00edt\u00e1son \u00e1t kellene menni. Az \u00faj sebezhet\u0151s\u00e9g nem olyan s\u00falyos, mint az el\u0151z\u0151, mivel az SSH-szerver \u00e1ltal ind\u00edtott gyermekfolyamatban a jogosults\u00e1gok vissza\u00e1ll\u00edt\u00e1sa ut\u00e1n jelentkezik. A sebezhet\u0151s\u00e9g megtal\u00e1lhat\u00f3 a Red Hat Enterprise Linux 9 disztrib\u00faci\u00f3b\u00f3l sz\u00e1rmaz\u00f3 openssh csomagokban, amelyek az 2021-ben k\u00f6zz\u00e9tett OpenSSH 8.7 kiad\u00e1s\u00e1n alapulnak. A probl\u00e9ma a Fedora Linux 36 \u00e9s 37 csomagjait is \u00e9rinti, amelyek az OpenSSH 8.7 \u00e9s 8.8 kiad\u00e1sain alapulnak. <\/p>\n

A sebezhet\u0151s\u00e9g l\u00e9nyege, hogy hasonl\u00f3 a kor\u00e1bbi probl\u00e9m\u00e1hoz, \u00e9s szint\u00e9n a SIGALRM megszak\u00edt\u00f3 kezel\u0151ben fell\u00e9p\u0151 verseny\u00e1llapot okozza, amely az aszinkron m\u00f3dban a jelek kezel\u0151ib\u0151l sz\u00e1rmaz\u00f3 funkci\u00f3k v\u00e9grehajt\u00e1s\u00e1nak k\u00f6vetkezm\u00e9nye. A kezel\u0151 a LoginGraceTime param\u00e9ter \u00e1ltal meghat\u00e1rozott id\u0151t\u00fall\u00e9p\u00e9skor l\u00e9p m\u0171k\u00f6d\u00e9sbe, megszak\u00edtva a k\u00f3d jelenlegi v\u00e9grehajt\u00e1s\u00e1t. Az aszinkron v\u00e9grehajt\u00e1sra nem felk\u00e9sz\u00edtett, dinamikus mem\u00f3riafoglal\u00e1st alkalmaz\u00f3 funkci\u00f3k, mint p\u00e9ld\u00e1ul a syslog(), haszn\u00e1lata a megszak\u00edt\u00f3 kezel\u0151ben a malloc bels\u0151 strukt\u00far\u00e1j\u00e1nak s\u00e9r\u00fcl\u00e9s\u00e9hez vezethet, amikor a SIGALRM a k\u00f3d v\u00e9grehajt\u00e1sa sor\u00e1n bek\u00f6vetkezik. <\/p>\n

Az \u00faj sebezhet\u0151s\u00e9g abban k\u00fcl\u00f6nb\u00f6zik, hogy a versenyhelyzet a grace_alarm_handler() jelkezel\u0151ben a cleanup_exit() funkci\u00f3 h\u00edv\u00e1s\u00e1val keletkezik. Az OpenSSH f\u0151 k\u00f3dalapj\u00e1ban ez a funkci\u00f3 aszinkron m\u00f3don v\u00e9grehajtott k\u00f3dra haszn\u00e1lhat\u00f3, de a RHEL 9 \u00e9s Fedora csomagokhoz egy tov\u00e1bbi jav\u00edt\u00e1st alkalmaztak, amely a cleanup_exit() h\u00edv\u00e1s\u00e1ban audit esem\u00e9nyek gener\u00e1l\u00e1s\u00e1hoz haszn\u00e1lt funkci\u00f3t tartalmaz. <\/p>\n

Ez a jav\u00edt\u00e1s a RHEL 9 \u00e9s az OpenSSH 8.7p1 alap\u00fa disztrib\u00faci\u00f3k csomagjaiban lett haszn\u00e1lva. A Fedora aktu\u00e1lis kiad\u00e1saiban a probl\u00e9ma nem jelentkezik, mivel a Fedora 38-t\u00f3l kezdve a disztrib\u00faci\u00f3 egy \u00fajabb OpenSSH verzi\u00f3ra v\u00e1ltott a cleanup_exit() m\u00f3dos\u00edt\u00e1sa n\u00e9lk\u00fcl. A kor\u00e1bbi sebezhet\u0151s\u00e9gt\u0151l elt\u00e9r\u0151en az \u00faj probl\u00e9ma blokkol\u00e1s\u00e1ra nem m\u0171k\u00f6dik az sshd-ben a log kimenet\u00e9t a syslog-on kereszt\u00fcl letilt\u00f3 «-e» opci\u00f3 haszn\u00e1lat\u00e1val. Ugyanakkor a sebezhet\u0151s\u00e9g blokkol\u00e1s\u00e1hoz az sshd_config f\u00e1jlban be\u00e1ll\u00edthat\u00f3 a «LoginGraceTime=0» param\u00e9ter.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0438\u0437\u0443\u0447\u0435\u043d\u0438\u044f \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u043d\u0430 \u043f\u0440\u043e\u0448\u043b\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 OpenSSH, \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u043f\u043e\u0445\u043e\u0436\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-6409), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f 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\u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430 Red Hat Enterprise Linux 9, […]<\/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-117137","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\udd47A RHEL 9 csomagjaiban tal\u00e1lhat\u00f3 OpenSSH sebezhet\u0151s\u00e9ge, amely t\u00e1voli k\u00f3d v\u00e9grehajt\u00e1s\u00e1t teszi lehet\u0151v\u00e9 | ProHoster","description":"A m\u00falt h\u00e9ten felfedezett kritikus OpenSSH sebezhet\u0151s\u00e9ggel kapcsolatos vizsg\u00e1lat sor\u00e1n egy hasonl\u00f3 sebezhet\u0151s\u00e9get is felfedeztek (CVE-2024-6409), amely lehet\u0151v\u00e9 teszi a k\u00f3d t\u00e1voli v\u00e9grehajt\u00e1s\u00e1t jogosults\u00e1gok megker\u00fcl\u00e9s\u00e9vel.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-paketah-s-openssh-iz-sostava-rhel-9-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043f\u0430\u043a\u0435\u0442\u0430\u0445 \u0441 OpenSSH \u0438\u0437 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