Ap\u00f3s seis meses de desenvolvimento, foi lan\u00e7ado o OpenSSH 8.9, uma implementa\u00e7\u00e3o aberta do cliente e servidor para trabalhar com os protocolos SSH 2.0 e SFTP. Na nova vers\u00e3o, uma vulnerabilidade no sshd foi corrigida, potencialmente permitindo o acesso sem autentica\u00e7\u00e3o. O problema foi causado por um estouro de inteiro no c\u00f3digo de autentica\u00e7\u00e3o, mas sua explora\u00e7\u00e3o \u00e9 poss\u00edvel apenas em combina\u00e7\u00e3o com outros erros l\u00f3gicos no c\u00f3digo. <\/p>\n
No estado atual, a vulnerabilidade n\u00e3o \u00e9 explor\u00e1vel quando o modo de separa\u00e7\u00e3o de privil\u00e9gios est\u00e1 ativado, pois sua manifesta\u00e7\u00e3o \u00e9 bloqueada por verifica\u00e7\u00f5es separadas realizadas no c\u00f3digo de rastreamento de separa\u00e7\u00e3o de privil\u00e9gios. O modo de separa\u00e7\u00e3o de privil\u00e9gios foi ativado por padr\u00e3o em 2002, come\u00e7ando com o OpenSSH 3.2.2, e \u00e9 obrigat\u00f3rio desde o lan\u00e7amento do OpenSSH 7.5, publicado em 2017. Al\u00e9m disso, nas vers\u00f5es port\u00e1teis do OpenSSH a partir do lan\u00e7amento 6.5 (2014), a vulnerabilidade \u00e9 bloqueada pela compila\u00e7\u00e3o com a inclus\u00e3o de flags de prote\u00e7\u00e3o contra estouros de inteiros. <\/p>\n
Outras mudan\u00e7as: <\/p>\n
Em uma das pr\u00f3ximas vers\u00f5es, est\u00e1 planejada a mudan\u00e7a padr\u00e3o do utilit\u00e1rio scp para o uso de SFTP, em vez do protocolo obsoleto SCP\/RCP. O SFTP adota m\u00e9todos de manuseio de nomes mais previs\u00edveis e n\u00e3o utiliza a manipula\u00e7\u00e3o de glob nos nomes de arquivos no lado do outro host, o que cria problemas de seguran\u00e7a. Em particular, ao usar SCP e RCP, o servidor decide quais arquivos e diret\u00f3rios enviar ao cliente, enquanto o cliente apenas verifica a validade dos nomes de objetos retornados, permitindo a transmiss\u00e3o de outros nomes de arquivos diferentes dos solicitados na aus\u00eancia de verifica\u00e7\u00f5es apropriadas. servidor<\/a> transmitir outros nomes de arquivos, diferentes dos solicitados. O protocolo SFTP n\u00e3o tem os problemas mencionados, mas n\u00e3o suporta a expans\u00e3o de caminhos especiais, como \u00ab~\/\u00bb. Para corrigir essa diferen\u00e7a, na vers\u00e3o passada do OpenSSH, foi proposta uma nova extens\u00e3o do protocolo SFTP para a expans\u00e3o dos caminhos ~\/ e ~user\/. \u041f\u043e\u0441\u043b\u0435 \u0448\u0435\u0441\u0442\u0438 \u043c\u0435\u0441\u044f\u0446\u0435\u0432 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 OpenSSH 8.9, \u043e\u0442\u043a\u0440\u044b\u0442\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043a\u043b\u0438\u0435\u043d\u0442\u0430 \u0438 \u0441\u0435\u0440\u0432\u0435\u0440\u0430 \u0434\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u043e \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u0430\u043c SSH 2.0 \u0438 SFTP. \u0412 \u043d\u043e\u0432\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0432 sshd \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0434\u043e\u0441\u0442\u0443\u043f \u0431\u0435\u0437 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0446\u0435\u043b\u043e\u0447\u0438\u0441\u043b\u0435\u043d\u043d\u044b\u043c \u043f\u0435\u0440\u0435\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u0432 \u043a\u043e\u0434\u0435 \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438, \u043d\u043e \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0432 \u0441\u043e\u0447\u0435\u0442\u0430\u043d\u0438\u0438 \u0441 \u0434\u0440\u0443\u0433\u0438\u043c\u0438 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u043e\u0448\u0438\u0431\u043a\u0430\u043c\u0438 \u0432 \u043a\u043e\u0434\u0435. \u0412 \u0442\u0435\u043a\u0443\u0449\u0435\u043c […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103424","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\udd47Lan\u00e7amento do OpenSSH 8.9 com corre\u00e7\u00e3o de vulnerabilidade no sshd | ProHoster","description":"Ap\u00f3s seis meses de desenvolvimento, foi lan\u00e7ado o OpenSSH 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"