U patchu gssapi.patch, koji se koristi u mnogim Linux distribucijama i koji dodaje podr\u0161ku za razmjenu klju\u010deva na bazi GSSAPI u OpenSSH, otkrivena je ranjivost (CVE-2026-3497) koja vodi do dereferenciranja pokaziva\u010da, o\u0161te\u0107enja memorije i zaobila\u017eenja mehanizma podjele privilegija (Privsep). Ranjivost se mo\u017ee eksploatisati daljinski u fazi prije autentifikacije. Istra\u017eiva\u010d koji je otkrio problem demonstrirao je iniciranje ru\u0161enja procesa slanjem jednog modificiranog paketa na SSH poslu\u017eitelj. Nije isklju\u010deno da osim usluge, postoje opasniji na\u010dini eksploatacije ranjivosti. <\/p>\n
Zanimljivo je da su se prije neki developeri OpenSSH odlu\u010dili ne prihvatiti izmjenu za podr\u0161ku GSSAPI u glavni sastav zbog sumnji u njenu sigurnost. Ipak, mnoge Linux distribucije uklju\u010dile su ovaj patch u svoje pakete s OpenSSH. U praksi se susre\u0107e nekoliko verzija GSSAPI patcha, no ve\u0107ina njih ima gre\u0161ku koja dovodi do ranjivosti. Ispravak je trenutno dostupan samo u obliku patcha, \u010dija se promjena svodi na zamjenu poziva funkcije sshpkt_disconnect() na ssh_packet_disconnect() u datoteci kexgsss.c. <\/p>\n
Trenutno je potvr\u0111eno postojanje ranjivosti u Debianu i Ubuntuu. U ostalim distribucijama se razmatra primjena problemati\u010dnog zakrpljenja i njegova podlo\u017enost ranjivosti (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). Ranjivost se manifestira samo kada je uklju\u010dena opcija «GSSAPIKeyExchange yes» u postavkama. Na mogu\u0107nost iskoristivosti tako\u0111er utje\u010du opcije kompajlera s kojima je paket sastavljen u distribucijama. <\/p>\n
Uzrok nastanka ranjivosti je gre\u0161ka u funkciji sshpkt_disconnect(), zbog koje proces nije zavr\u0161avao nakon primanja disconnect poruke, \u0161to je omogu\u0107ilo napada\u010du u fazi pregovaranja klju\u010deva da po\u0161alje nepredvi\u0111enu logikom rada poslu\u017eitelja<\/a> tip GSSAPI poruke. Nakon primitka izvanredne GSSAPI poruke, server<\/a> stavlja ga u red i ne prekida izvr\u0161avanje programa, ali pritom ne inicijalizira varijable koje definiraju parametre veze. Dalje, u ciklusu obrade doga\u0111aja izvr\u0161ava se kod koji \u010dita neinicijaliziranu strukturu recv_tok iz stoga (\u010ditaju se podaci koji su ostali u stogu od pro\u0161log poziva funkcije), \u0161alje je privilegiranom procesu putem IPC-a i zatim proslje\u0111uje funkciji gss_release_buffer(), koja mo\u017ee pozvati funkciju free() i osloboditi memoriju za neispravnu adresu koja upu\u0107uje na nasumi\u010dno podru\u010dje memorije. \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 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0439 (Privsep). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u043d\u0430 \u0441\u0442\u0430\u0434\u0438\u0438 \u0434\u043e \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u043b\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u0412\u044b\u044f\u0432\u0438\u0432\u0448\u0438\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b \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\udd47Ranjivost u GSSAPI patchu za OpenSSH, koja se mo\u017ee daljinski iskoristiti u fazi prije autentifikacije | ProHoster","description":"U primijenjenom u mnogim distribucijama Linuxa patchu gssapi.patch, koji dodaje podr\u0161ku za razmjenu klju\u010deva temeljenu na GSSAPI unutar OpenSSH, otkrivena je ranjivost (CVE-2026-3497) koja dovodi do dereferenciranja pokaziva\u010da i o\u0161te\u0107enja.","canonical_url":"https:\/\/prohoster.info\/hr\/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":"hr_HR","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, 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Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"