Despu\u00e9s de seis meses de desarrollo, se presenta la versi\u00f3n OpenSSH 8.9, una implementaci\u00f3n abierta del cliente y servidor para trabajar con los protocolos SSH 2.0 y SFTP. En esta nueva versi\u00f3n se ha corregido una vulnerabilidad en sshd que podr\u00eda permitir el acceso sin autenticaci\u00f3n. El problema se debe a un desbordamiento de enteros en el c\u00f3digo de autenticaci\u00f3n, pero su explotaci\u00f3n solo es posible en combinaci\u00f3n con otros errores l\u00f3gicos en el c\u00f3digo. <\/p>\n
En su estado actual, la vulnerabilidad no es explotable al activar el modo de separaci\u00f3n de privilegios, ya que su manifestaci\u00f3n es bloqueada por verificaciones espec\u00edficas realizadas en el c\u00f3digo de seguimiento de separaci\u00f3n de privilegios. Este modo se activ\u00f3 de forma predeterminada en 2002, comenzando con OpenSSH 3.2.2, y es obligatorio desde el lanzamiento de OpenSSH 7.5, publicado en 2017. Adem\u00e1s, en las versiones portables de OpenSSH a partir de la versi\u00f3n 6.5 (2014), la vulnerabilidad es bloqueada al compilar con las banderas de protecci\u00f3n contra desbordamientos de enteros. <\/p>\n
Otros cambios: <\/p>\n
En una de las siguientes versiones, se planea cambiar por defecto la utilidad scp para usar SFTP en lugar del obsoleto protocolo SCP\/RCP. En SFTP se utilizan m\u00e9todos de manejo m\u00e1s predecibles de los nombres y no se emplea el procesamiento de patrones glob en los nombres de archivos a trav\u00e9s del shell en el otro host, lo que crea problemas de seguridad. En particular, al usar SCP y RCP, el servidor decide qu\u00e9 archivos y directorios se env\u00edan al cliente, y el cliente solo verifica la validez de los nombres de los objetos devueltos, lo que, en ausencia de las debidas comprobaciones del lado del cliente, permite servidor<\/a> transferir otros nombres de archivos que difieran de los solicitados. El protocolo SFTP no presenta los problemas mencionados, pero no soporta la expansi\u00f3n de rutas especiales, como \u00ab~\/\u00bb. Para solucionar esta discrepancia, en la versi\u00f3n anterior de OpenSSH, se propuso una nueva extensi\u00f3n del protocolo SFTP para la expansi\u00f3n de las rutas ~\/ y ~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\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\udd47 Lanzamiento de OpenSSH 8.9 con correcci\u00f3n de vulnerabilidad en sshd | ProHoster","description":"Despu\u00e9s de seis meses de desarrollo, se presenta el lanzamiento de 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"