{"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\/et\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","title":{"rendered":"GSSAPI plaastri haavatavus OpenSSH-s, mida saab kaugelt \u00e4ra kasutada autentimise eel.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Palju Linuxi distributsioonides kasutatavates gssapi.patch-i plaastrites, mis lisab OpenSSH-le GSSAPI p\u00f5hiseid v\u00f5tmevahetuse toe, on tuvastatud haavatavus (CVE-2026-3497), mis viib osutaja dereferentsimiseni, m\u00e4lu kahjustumiseni ja privileegide eraldamise mehhanismi (Privsep) \u00fcmbersuunamiseni. Haavatavust saab kaugelt \u00e4ra kasutada enne autentimise toimumist. Probleemi avastanud teadlane demonstreeris protsessi h\u00e4vimise algatamist, saates SSH-serverile \u00fche muudetud v\u00f5rgu paketti. Ei ole v\u00e4listatud, et peale teenuse katkestamise on haavatavuse jaoks olemas veel ohtlikumaid \u00e4ra kasutamise variante. <\/p>\n

On t\u00e4helepanuv\u00e4\u00e4rne, et kunagi keeldusid OpenSSH arendajad GSSAPI toe toetamise muudatuse p\u00e4\u00e4stmisest, p\u00f5hjustades kahtlusi selle turvalisuses. Paljud Linuxi distributsioonid on siiski selle plaastri oma OpenSSH pakettidesse lisanud. GSSAPI plaastri mitu versiooni on levinud, kuid enamikus neist on haavatavust p\u00f5hjustav viga. Parandus on hetkel saadaval vaid plaastri vormis, mille muudatused h\u00f5lmavad sshpkt_disconnect() funktsiooni v\u00e4ljakutse asendamist ssh_packet_disconnect() funktsiooniga failis kexgsss.c. <\/p>\n

Praegu on haavatavuse olemasolu kinnitatud Debianis ja Ubuntu's. \u00dclej\u00e4\u00e4nud distributiivides selgitatakse probleemse plaastri kasutamist ja selle haavatavust (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). Haavatavus ilmneb ainult siis, kui seadistustes on sisse l\u00fclitatud valik \u201eGSSAPIKeyExchange yes\u201d. Eksploitatsiooni v\u00f5imalusele avaldavad m\u00f5ju ka kompilatsioonivalikud, millega pakett distributiivides kokku pandud on. <\/p>\n

Haavatavuse tekkimise p\u00f5hjuseks on viga sshpkt_disconnect() funktsioonis, mille t\u00f5ttu protsess ei l\u00f5petanud p\u00e4rast disconnect-s\u00f5numi vastuv\u00f5tmist, mis v\u00f5imaldas r\u00fcndajal v\u00f5tmete kokkuleppimise etapis saata mitte etten\u00e4htud GSSAPI s\u00f5numit. serverilt<\/a> P\u00e4rast ettem\u00e4\u00e4ramata GSSAPI s\u00f5numi saamist, server<\/a> paneb tema j\u00e4rjekorda ja ei katkesta programmi t\u00e4itmist, kuid ei initsialiseeri samal ajal \u00fchenduse parameetreid m\u00e4\u00e4ravaid muutujaid. Hiljem, s\u00fcndmuste t\u00f6\u00f6tlemise ts\u00fcklis, t\u00e4idab koodi, mis loeb initsialiseerimata struktuuri recv_tok virnast (loetakse andmed, mis on virnas j\u00e4\u00e4nud eelmise funktsiooni kutsumise j\u00e4rel), saadab selle privileeritud protsessile l\u00e4bi IPC ja seej\u00e4rel edastab gss_release_buffer() funktsiooni, mis v\u00f5ib kutsuda funktsiooni free() ja vabastada m\u00e4lu vale viitaja jaoks, mis viitab juhuslikule m\u00e4lu piirkonnale.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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plaastri haavatavus OpenSSH-s, mida saab kaugelt \u00e4ra kasutada enne autentimist | ProHoster","description":"Paljudes Linuxi distributiivides kasutusel olevas plaastris gssapi.patch, mis lisab OpenSSH-sse GSSAPI-p\u00f5histe v\u00f5tmevahetuse toe, avastati haavatavus (CVE-2026-3497), mis viib viitaja dereferseerimiseni ja kahjustumiseni.","canonical_url":"https:\/\/prohoster.info\/et\/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":"et_EE","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\/et\/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\/et\/wp-json\/wp\/v2\/posts\/164054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/comments?post=164054"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/164054\/revisions"}],"predecessor-version":[{"id":173149,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/posts\/164054\/revisions\/173149"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/media?parent=164054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/categories?post=164054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/et\/wp-json\/wp\/v2\/tags?post=164054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}