{"id":164054,"date":"2026-03-13T11:12:02","date_gmt":"2026-03-13T09:12:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii"},"modified":"2026-03-13T11:12:02","modified_gmt":"2026-03-13T09:12:02","slug":"uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","title":{"rendered":"Sebezhet\u0151s\u00e9g az OpenSSH-hoz k\u00e9sz\u00fclt GSSAPI jav\u00edt\u00f3csomagban, amely t\u00e1volr\u00f3l alkalmazhat\u00f3 az autentik\u00e1ci\u00f3 el\u0151tti szakaszban.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A biztons\u00e1gi r\u00e9s, amely az OpenSSH GSSAPI-alap\u00fa kulcsm\u00f3dos\u00edt\u00e1si t\u00e1mogat\u00e1s\u00e1t hozz\u00e1ad\u00f3 gssapi.patch-ban tal\u00e1lhat\u00f3, a mem\u00f3ria derefer\u00e1l\u00e1s\u00e1hoz, a mem\u00f3ria s\u00e9r\u00fcl\u00e9s\u00e9hez \u00e9s a privil\u00e9giumok elv\u00e1laszt\u00e1s\u00e1nak megker\u00fcl\u00e9s\u00e9hez vezet (Privsep). A s\u00e9r\u00fcl\u00e9kenys\u00e9g t\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 az autentik\u00e1ci\u00f3s folyamat el\u0151tt. A probl\u00e9ma felfedez\u0151je bemutatta, hogy egy m\u00f3dos\u00edtott h\u00e1l\u00f3zati csomag k\u00fcld\u00e9s\u00e9vel lefagyasztja az SSH szervert. Nem z\u00e1rhat\u00f3 ki, hogy a szolg\u00e1ltat\u00e1smegtagad\u00e1s mellett a sebezhet\u0151s\u00e9g m\u00e1s, vesz\u00e9lyesebb kihaszn\u00e1l\u00e1si lehet\u0151s\u00e9gei is l\u00e9teznek. <\/p>\n

Figyelemre m\u00e9lt\u00f3, hogy az OpenSSH fejleszt\u0151i a GSSAPI t\u00e1mogat\u00e1s\u00e1ra vonatkoz\u00f3 javaslatot kezdetben elutas\u00edtott\u00e1k, mivel nem voltak biztosak annak biztons\u00e1g\u00e1ban. Ennek ellen\u00e9re sz\u00e1mos Linux disztrib\u00faci\u00f3 be\u00e9p\u00edtette ezt a jav\u00edt\u00e1st az OpenSSH csomagjaiba. A GSSAPI jav\u00edt\u00e1si v\u00e1ltozatainak t\u00f6bb verzi\u00f3ja l\u00e9tezik, azonban a legt\u00f6bbj\u00fckben van egy, a s\u00e9r\u00fcl\u00e9kenys\u00e9ghez vezet\u0151 hiba. A hiba jav\u00edt\u00e1sa jelenleg csak jav\u00edtott form\u00e1ban \u00e9rhet\u0151 el, amely a kexgsss.c f\u00e1jlban a sshpkt_disconnect() f\u00fcggv\u00e9ny h\u00edv\u00e1s\u00e1nak ssh_packet_disconnect()-ra t\u00f6rt\u00e9n\u0151 cser\u00e9l\u00e9sekor t\u00f6rt\u00e9nik. <\/p>\n

Jelenleg a Debian \u00e9s Ubuntu eset\u00e9ben meger\u0151s\u00edtett\u00e9k a sebezhet\u0151s\u00e9g l\u00e9tez\u00e9s\u00e9t. A t\u00f6bbi disztrib\u00faci\u00f3 eset\u00e9ben a probl\u00e9m\u00e1s jav\u00edt\u00f3csomag alkalmaz\u00e1sa \u00e9s annak sebezhet\u0151s\u00e9gre vonatkoz\u00f3 meger\u0151s\u00edt\u00e9se folyamatban van (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). A sebezhet\u0151s\u00e9g csak akkor jelentkezik, ha a be\u00e1ll\u00edt\u00e1sokban a \u201eGSSAPIKeyExchange yes\u201d opci\u00f3 enged\u00e9lyezve van. A kihaszn\u00e1l\u00e1s lehet\u0151s\u00e9g\u00e9t a disztrib\u00faci\u00f3khoz tartoz\u00f3 csomagok \u00f6ssze\u00e1ll\u00edt\u00e1s\u00e1hoz haszn\u00e1lt ford\u00edt\u00f3 opci\u00f3k is befoly\u00e1solj\u00e1k. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9g oka a sshpkt_disconnect() f\u00fcggv\u00e9nyben tal\u00e1lhat\u00f3 hiba, amely miatt a folyamat nem fejez\u0151d\u00f6tt be a disconnect \u00fczenet \u00e9rkez\u00e9se ut\u00e1n, ez lehet\u0151v\u00e9 tette a t\u00e1mad\u00f3 sz\u00e1m\u00e1ra, hogy a kulcskonzult\u00e1ci\u00f3 f\u00e1zis\u00e1ban olyan \u00fczenetet k\u00fcldj\u00f6n, amelyet a m\u0171k\u00f6d\u00e9si logika nem tervezett. a szerver<\/a> GSSAPI \u00fczenet t\u00edpusa. A nem tervezett GSSAPI \u00fczenetek \u00e9rkez\u00e9se ut\u00e1n, szerver<\/a> elhelyezi azt a sorban, \u00e9s nem szak\u00edtja meg aprogram v\u00e9grehajt\u00e1s\u00e1t, de nem inicializ\u00e1lja azokat a v\u00e1ltoz\u00f3kat, amelyek a kapcsolat param\u00e9tereit hat\u00e1rozz\u00e1k meg. A j\u00f6v\u0151ben az esem\u00e9nykezel\u00e9s sor\u00e1n a k\u00f3dot hajtj\u00e1k v\u00e9gre, amely olvassa az inicializ\u00e1latlan recv_tok strukt\u00far\u00e1t a veremb\u0151l (azokat az adatokat olvassa, amelyek a funkci\u00f3 kor\u00e1bbi megh\u00edv\u00e1s\u00e1b\u00f3l maradtak a veremben), elk\u00fcldi a jogosults\u00e1ggal rendelkez\u0151 folyamatnak IPC-n kereszt\u00fcl, majd \u00e1tadja a gss_release_buffer() f\u00fcggv\u00e9nynek, amely h\u00edvhatja a free() f\u00fcggv\u00e9nyt, \u00e9s felszabad\u00edthatja a mem\u00f3ri\u00e1t egy \u00e9rv\u00e9nytelen mutat\u00f3ra, amely v\u00e9letlenszer\u0171 mem\u00f3ria ter\u00fcletre mutat.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Linux \u043f\u0430\u0442\u0447\u0435 gssapi.patch, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0432 OpenSSH \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u043e\u0431\u043c\u0435\u043d\u0430 \u043a\u043b\u044e\u0447\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 GSSAPI, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-3497), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0440\u0430\u0437\u044b\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u044e \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f, \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u043e\u0431\u0445\u043e\u0434\u0443 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\u0438\u043d\u0438\u0446\u0438\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0430\u0432\u0430\u0440\u0438\u0439\u043d\u043e\u0433\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u043d\u0430 SSH-\u0441\u0435\u0440\u0432\u0435\u0440 \u043e\u0434\u043d\u043e\u0433\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-164054","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 GSSAPI-patch sebezhet\u0151s\u00e9ge az OpenSSH-ban, amely t\u00e1volr\u00f3l kihaszn\u00e1lhat\u00f3 az autentik\u00e1ci\u00f3 el\u0151tti szakaszban | ProHoster","description":"A sok Linux disztrib\u00faci\u00f3ban haszn\u00e1lt gssapi.patch, amely GSSAPI-alap\u00fa kulcscsere t\u00e1mogat\u00e1st ad az OpenSSH-hoz, sebezhet\u0151s\u00e9get (CVE-2026-3497) t\u00e1rt fel, amely a mutat\u00f3 dereferenci\u00e1hoz \u00e9s a s\u00e9r\u00fcl\u00e9shez vezet.","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","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 GSSAPI-\u043f\u0430\u0442\u0447\u0435 \u043a OpenSSH, \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u0430\u044f \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u0438 \u0434\u043e \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438 | ProHoster","og:description":"\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u043c \u0432\u043e \u043c\u043d\u043e\u0433\u0438\u0445 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430\u0445 Linux \u043f\u0430\u0442\u0447\u0435 gssapi.patch, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u043c \u0432 OpenSSH \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u043e\u0431\u043c\u0435\u043d\u0430 \u043a\u043b\u044e\u0447\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 GSSAPI, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2026-3497), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0440\u0430\u0437\u044b\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u044e \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044f, \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e.","og:url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2026-03-13T09:12:02+00:00","article:modified_time":"2026-03-13T09:12:02+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/164054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=164054"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/164054\/revisions"}],"predecessor-version":[{"id":173149,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/164054\/revisions\/173149"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=164054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=164054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=164054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}