{"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\/it\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","title":{"rendered":"Vulnerabilit\u00e0 nel patch GSSAPI per OpenSSH, sfruttabile da remoto nella fase precedente all'autenticazione","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>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 puntatori, danneggiamento della memoria e bypass del meccanismo di separazione dei privilegi (Privsep). La vulnerabilit\u00e0 pu\u00f2 essere sfruttata da remoto prima dell'autenticazione. Il ricercatore che ha identificato il problema ha dimostrato come provocare un crash del processo inviando un pacchetto di rete modificato a un server SSH. Non si esclude che, oltre a causare un denial of service, esistano opzioni di sfruttamento della vulnerabilit\u00e0 pi\u00f9 pericolose.      <\/p>\n<p>\u00c8 interessante notare che in passato gli sviluppatori di OpenSSH hanno rifiutato di includere nel prodotto principale la modifica per supportare GSSAPI a causa di dubbi sulla sua sicurezza. Tuttavia, molte distribuzioni Linux hanno incluso questo patch nei loro pacchetti OpenSSH. Esistono diverse versioni del patch GSSAPI, ma la maggior parte di esse presenta un errore che porta alla vulnerabilit\u00e0. La correzione \u00e8 attualmente disponibile solo sotto forma di patch, la cui modifica consiste nella sostituzione della chiamata alla funzione sshpkt_disconnect() con ssh_packet_disconnect() nel file kexgsss.c.    <\/p>\n<p>Attualmente, \u00e8 stata confermata la presenza di una vulnerabilit\u00e0 in Debian e Ubuntu. Negli altri sistemi operativi, l'applicazione della patch problematica e la sua suscettibilit\u00e0 alla vulnerabilit\u00e0 sono in fase di chiarimento (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). La vulnerabilit\u00e0 si manifesta solo quando l'opzione \"GSSAPIKeyExchange yes\" \u00e8 abilitata nelle impostazioni. Anche le opzioni del compilatore utilizzate per costruire il pacchetto nei vari sistemi influiscono sulla possibilit\u00e0 di sfruttare la vulnerabilit\u00e0.        <\/p>\n<p>La causa dell'insorgere della vulnerabilit\u00e0 \u00e8 un errore nella funzione sshpkt_disconnect(), che impediva al processo di terminarsi dopo la ricezione del messaggio di disconnessione, il che permetteva all'attaccante, durante il processo di negoziazione delle chiavi, di inviare un messaggio GSSAPI non previsto dalla logica di funzionamento. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/dts-los-angeles\/\" title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a> della tipologia di messaggio GSSAPI. Dopo la ricezione di un messaggio GSSAPI imprevisto,  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/server\/\"   title=\"server\" data-wpil-keyword-link=\"linked\">server<\/a> lo mette in coda senza interrompere l'esecuzione del programma, ma non inizializza le variabili che definiscono i parametri di connessione. In seguito, nel ciclo di elaborazione degli eventi viene eseguito il codice che legge la struttura non inizializzata recv_tok dallo stack (viene lettto i 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 si riferisce a un'area casuale di memoria.<br \/>\n<br \/>Fonte: <a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64983\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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OpenSSH, sfruttabile da remoto nella fase precedente all'autenticazione | ProHoster","description":"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 una dereferenziazione del puntatore e a un danneggiamento.","canonical_url":"https:\/\/prohoster.info\/it\/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":"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 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