{"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\/pt\/blog\/news\/uyazvimost-v-gssapi-patche-k-openssh-udalyonno-ekspluatiruemaya-na-stadii-do-autentifikaczii","title":{"rendered":"Vulnerabilidade no patch GSSAPI para OpenSSH, explor\u00e1vel remotamente antes da autentica\u00e7\u00e3o","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

No patch utilizado em muitas distribui\u00e7\u00f5es Linux, gssapi.patch, que adiciona suporte \u00e0 troca de chaves baseado em GSSAPI no OpenSSH, foi encontrada uma vulnerabilidade (CVE-2026-3497), levando ao desreferenciamento de ponteiro, corrup\u00e7\u00e3o de mem\u00f3ria e comprometimento do mecanismo de separa\u00e7\u00e3o de privil\u00e9gios (Privsep). A vulnerabilidade pode ser explorada remotamente na fase anterior \u00e0 autentica\u00e7\u00e3o. O pesquisador que identificou o problema demonstrou a possibilidade de causar a falha do processo ao enviar um \u00fanico pacote de rede modificado para o servidor SSH. N\u00e3o se pode descartar que, al\u00e9m da nega\u00e7\u00e3o de servi\u00e7o, existam op\u00e7\u00f5es mais perigosas de explora\u00e7\u00e3o da vulnerabilidade. <\/p>\n

\u00c9 not\u00e1vel que, em seu tempo, os desenvolvedores do OpenSSH se recusaram a incluir a modifica\u00e7\u00e3o para suporte ao GSSAPI devido a d\u00favidas sobre sua seguran\u00e7a. Entretanto, muitas distribui\u00e7\u00f5es Linux inclu\u00edram este patch em seus pacotes com OpenSSH. Existem v\u00e1rias vers\u00f5es do patch GSSAPI em circula\u00e7\u00e3o, mas a maioria cont\u00e9m um erro que leva \u00e0 vulnerabilidade. A corre\u00e7\u00e3o est\u00e1 dispon\u00edvel apenas na forma de patch, que consiste na substitui\u00e7\u00e3o da chamada da fun\u00e7\u00e3o sshpkt_disconnect() por ssh_packet_disconnect() no arquivo kexgsss.c. <\/p>\n

Atualmente, a vulnerabilidade foi confirmada no Debian e Ubuntu. Em outras distribui\u00e7\u00f5es, a aplica\u00e7\u00e3o do patch problem\u00e1tico e sua suscetibilidade \u00e0 vulnerabilidade est\u00e3o sendo verificadas (SUSE\/openSUSE, RHEL, Gentoo, Arch, Fedora). A vulnerabilidade se manifesta apenas quando a op\u00e7\u00e3o \"GSSAPIKeyExchange yes\" est\u00e1 habilitada nas configura\u00e7\u00f5es. A possibilidade de explora\u00e7\u00e3o tamb\u00e9m \u00e9 influenciada pelas op\u00e7\u00f5es do compilador com as quais o pacote foi constru\u00eddo nas distribui\u00e7\u00f5es. <\/p>\n

A causa da vulnerabilidade \u00e9 um erro na fun\u00e7\u00e3o sshpkt_disconnect(), que impediu que o processo fosse encerrado ap\u00f3s a recep\u00e7\u00e3o da mensagem de desconex\u00e3o, permitindo que um atacante, na fase de negocia\u00e7\u00e3o de chaves, enviasse um tipo de mensagem GSSAPI n\u00e3o previsto pela l\u00f3gica do sistema. servidor<\/a> Ap\u00f3s a recep\u00e7\u00e3o de uma mensagem GSSAPI fora do planejado, servidor<\/a> coloca-o na fila e n\u00e3o interrompe a execu\u00e7\u00e3o do programa, mas n\u00e3o inicializa as vari\u00e1veis que definem os par\u00e2metros de conex\u00e3o. Posteriormente, em um loop de processamento de eventos, \u00e9 executado um c\u00f3digo que l\u00ea a estrutura n\u00e3o inicializada recv_tok da pilha (dados deixados na pilha da chamada anterior da fun\u00e7\u00e3o), envia-a para um processo privilegiado via IPC e depois a passa para a fun\u00e7\u00e3o gss_release_buffer(), que pode chamar a fun\u00e7\u00e3o free() e liberar a mem\u00f3ria para um ponteiro inv\u00e1lido que aponta para uma \u00e1rea aleat\u00f3ria da mem\u00f3ria.
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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\udd47Vulnerabilidade no patch GSSAPI para OpenSSH, explor\u00e1vel remotamente na fase anterior \u00e0 autentica\u00e7\u00e3o | ProHoster","description":"No patch gssapi.patch, aplicado em muitas distribui\u00e7\u00f5es Linux, que adiciona suporte \u00e0 troca de chaves baseada em GSSAPI no OpenSSH, foi identificada uma vulnerabilidade (CVE-2026-3497) que leva ao desreferenciamento de ponteiros e corrup\u00e7\u00e3o.","canonical_url":"https:\/\/prohoster.info\/pt\/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":"pt_PT","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\/pt\/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\/pt\/wp-json\/wp\/v2\/posts\/164054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/comments?post=164054"}],"version-history":[{"count":2,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/164054\/revisions"}],"predecessor-version":[{"id":173149,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/posts\/164054\/revisions\/173149"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/media?parent=164054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/categories?post=164054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pt\/wp-json\/wp\/v2\/tags?post=164054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}