Nel patch gssapi.patch, utilizzato in molte distribuzioni Linux, che aggiunge il supporto per lo scambio di chiavi basato su GSSAPI in OpenSSH, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2026-3497) che porta a dereferenziazione di puntatore, corruzione di memoria e bypass del meccanismo di separazione dei privilegi (Privsep). La vulnerabilit\u00e0 pu\u00f2 essere sfruttata da remoto prima dell\u2019autenticazione. Il ricercatore che ha rilevato il problema ha dimostrato come provocare il crash del processo inviando un pacchetto di rete modificato a un server SSH. Non si esclude che, oltre a causare un'interruzione del servizio, ci siano possibilit\u00e0 di sfruttamento della vulnerabilit\u00e0 pi\u00f9 pericolose. <\/p>\n
\u00c8 interessante notare che in passato gli sviluppatori di OpenSSH rifiutarono di includere nel main branch la modifica per supportare GSSAPI a causa di dubbi sulla sua sicurezza. Tuttavia, molte distribuzioni Linux hanno incluso questa patch nei loro pacchetti con OpenSSH. Esistono diverse versioni della patch GSSAPI, ma nella maggior parte di esse \u00e8 presente un errore che porta a una vulnerabilit\u00e0. La correzione \u00e8 attualmente disponibile solo sotto forma di patch, che consiste nella sostituzione della chiamata alla funzione sshpkt_disconnect() con ssh_packet_disconnect() nel file kexgsss.c. <\/p>\n
Attualmente la vulnerabilit\u00e0 \u00e8 confermata in Debian e Ubuntu. Negli altri distributori, l'applicazione della patch problematica e la sua esposizione alla vulnerabilit\u00e0 sono in fase di verifica (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). La vulnerabilit\u00e0 si manifesta solo se \u00e8 abilitata l'opzione «GSSAPIKeyExchange yes» nelle impostazioni. Le opzioni del compilatore con cui il pacchetto \u00e8 stato assemblato influenzano anche la possibilit\u00e0 di sfruttamento. <\/p>\n
La causa della vulnerabilit\u00e0 \u00e8 un errore nella funzione sshpkt_disconnect(), che non terminava il processo dopo la ricezione del messaggio di disconnessione, consentendo all'attaccante, nella fase di negoziazione delle chiavi, di inviare un messaggio non previsto dalla logica operativa. server<\/a> tipo di messaggio GSSAPI. Dopo la ricezione di un messaggio GSSAPI imprevisto, un server<\/a> viene messo in coda e non interrompe l'esecuzione del programma, ma non inizializza le variabili che definiscono i parametri della connessione. In seguito, nel ciclo di elaborazione degli eventi, viene eseguito un codice che legge una struttura recv_tok non inizializzata dallo stack (dati rimasti nello stack dalla chiamata precedente della funzione), la invia a un processo privilegiato tramite IPC e poi la passa alla funzione gss_release_buffer(), che pu\u00f2 chiamare la funzione free() e liberare la memoria per un puntatore non valido che punta a una zona di memoria casuale. \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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\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\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u00e0 nel patch GSSAPI per OpenSSH, sfruttabile in remoto nella fase pre-autenticazione | ProHoster","description":"Nel patch gssapi.patch, utilizzato in molte distribuzioni Linux, che aggiunge il supporto GSSAPI per lo scambio di chiavi in OpenSSH, \u00e8 stata identificata una vulnerabilit\u00e0 (CVE-2026-3497) che porta a dereferenziare un puntatore, danneggiare la memoria e bypassare il meccanismo di separazione dei privilegi (Privsep). Questa vulnerabilit\u00e0 pu\u00f2 essere sfruttata in remoto nella fase precedente all'autenticazione. Il ricercatore che ha identificato il problema ha dimostrato l'avvio di un crash del processo inviando al server SSH un","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","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 \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","og:url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/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\/it\/wp-json\/wp\/v2\/posts\/164054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/comments?post=164054"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/164054\/revisions"}],"predecessor-version":[{"id":173149,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/posts\/164054\/revisions\/173149"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/media?parent=164054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/categories?post=164054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/it\/wp-json\/wp\/v2\/tags?post=164054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"