I den patch gssapi.patch, der anvendes i mange Linux-distributioner og tilf\u00f8jer support for GSSAPI-baseret n\u00f8gleudveksling i OpenSSH, er der opdaget en s\u00e5rbarhed (CVE-2026-3497), der f\u00f8rer til dereferencering af en peger, hukommelsesskader og omg\u00e5else af privilegiedelingen (Privsep) mekanismen. S\u00e5rbarheden kan udnyttes eksternt f\u00f8r godkendelse. Forskeren, der opdagede problemet, demonstrerede en procesnedbrud ved at sende en modificeret netv\u00e6rkspakke til SSH-serveren. Det er muligt, at der er mere alvorlige udnyttelsesmuligheder ud over tjenesten\u00e6gtelse. <\/p>\n
Det er bem\u00e6rkelsesv\u00e6rdigt, at OpenSSH-udviklerne tidligere satte sp\u00f8rgsm\u00e5let om at inkludere GSSAPI-support i hovedlinjen i bero p\u00e5 grund af sikkerhedsm\u00e6ssige tvivl. Alligevel har mange Linux-distributioner inkluderet denne patch i deres OpenSSH-pakker. Flere versioner af GSSAPI-patchen findes i brug, men de fleste indeholder en fejl, der f\u00f8rer til s\u00e5rbarheden. Rettelsen er i \u00f8jeblikket kun tilg\u00e6ngelig i form af en patch, der indeb\u00e6rer at erstatte funktionsopkaldet sshpkt_disconnect() med ssh_packet_disconnect() i kexgsss.c-filen. <\/p>\n
For tiden er en s\u00e5rbarhed bekr\u00e6ftet i Debian og Ubuntu. I de \u00f8vrige distributioner afklares anvendelsen af den problematiske patch og dens s\u00e5rbarhed (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). S\u00e5rbarheden optr\u00e6der kun, n\u00e5r indstillingen \"GSSAPIKeyExchange yes\" er aktiveret. Muligheden for udnyttelse p\u00e5virkes ogs\u00e5 af de compiler-indstillinger, som pakken er bygget med i distributionerne. <\/p>\n
\u00c5rsagen til s\u00e5rbarheden er en fejl i funktionen sshpkt_disconnect(), som gjorde, at processen ikke blev afsluttet efter modtagelse af en disconnect-besked, hvilket gjorde det muligt for angriberen at sende en type GSSAPI-besked, der ikke var forudset i driftens logik p\u00e5 n\u00f8glesamordningsstadiet. server<\/a> Efter modtagelsen af en uventet GSSAPI-besked, server<\/a> inds\u00e6tter det i k\u00f8en og afbryder ikke programmet, men initialiserer ikke de variabler, der definerer forbindelsesparametrene. I den f\u00f8lgende begivenhedsl\u00f8kke udf\u00f8res koden, der l\u00e6ser den ikke-initialiserede struktur recv_tok fra stakken (data, der er tilbage p\u00e5 stakken fra det foreg\u00e5ende funktionskald), sender den til en privilegeret proces via IPC og derefter overf\u00f8rer den til funktionen gss_release_buffer(), som kan kalde funktionen free() og frigive hukommelse til en ugyldig pointer henvisende til et vilk\u00e5rligt omr\u00e5de i hukommelsen. \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\udd47S\u00e5rbarhed i GSSAPI-patchen til OpenSSH, der kan udnyttes eksternt f\u00f8r autentifikation | ProHoster","description":"I et patch, gssapi.patch, der anvendes i mange Linux-distributioner, som tilf\u00f8jer support til n\u00f8gleudveksling baseret p\u00e5 GSSAPI i OpenSSH, er der identificeret en s\u00e5rbarhed (CVE-2026-3497), der f\u00f8rer til dereferering af en pointer og 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\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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Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"