{"id":36775,"date":"2019-10-31T22:13:44","date_gmt":"2019-10-31T19:13:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov\/"},"modified":"2019-10-31T22:13:44","modified_gmt":"2019-10-31T19:13:44","slug":"uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/uyazvimost-v-libreoffice-pozvolyayushhaya-vypolnit-kod-pri-otkrytii-vredonosnyh-dokumentov","title":{"rendered":"Vulnerabilidad en LibreOffice que permite ejecutar c\u00f3digo al abrir documentos maliciosos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En el paquete de oficina LibreOffice se ha detectado<\/a><\/noindex> una vulnerabilidad (CVE-2019-9848<\/a><\/noindex>), que puede ser utilizada para ejecutar c\u00f3digo arbitrario al abrir documentos preparados por un atacante. <\/p>\n

La vulnerabilidad se debe a que el componente LibreLogo, dise\u00f1ado para ense\u00f1ar programaci\u00f3n e insertar gr\u00e1ficos vectoriales, traduce sus operaciones a c\u00f3digo en Python. Al poder ejecutar instrucciones de LibreLogo, un atacante puede lograr la ejecuci\u00f3n de cualquier c\u00f3digo en Python en el contexto de la sesi\u00f3n actual del usuario, aprovechando el comando «run» proporcionado en LibreLogo. Desde Python, a trav\u00e9s de la funci\u00f3n system(), se pueden invocar comandos del sistema arbitrarios.<\/p>\n

LibreLogo es un componente opcional, pero en LibreOffice por defecto se ofrecen macros que permiten invocar LibreLogo y que no requieren confirmaci\u00f3n para su ejecuci\u00f3n, ni muestran advertencias, incluso cuando se activa el modo de m\u00e1xima protecci\u00f3n de macros (selecci\u00f3n del nivel «Very High»).
\nPara realizar un ataque, se puede vincular tal macro a un manejador de eventos que se activa, por ejemplo, al pasar el cursor del rat\u00f3n por una \u00e1rea espec\u00edfica o al activar el foco de entrada en el documento (evento onFocus). Como resultado, al abrir un documento preparado por el atacante, se puede lograr la ejecuci\u00f3n oculta de c\u00f3digo Python, sin que el usuario se d\u00e9 cuenta. Por ejemplo, en el caso del exploit demostrado, al abrir el documento, sin previo aviso se activa la calculadora del sistema.
\n

\"Vulnerabilidad<\/center><\/p>\n

La vulnerabilidad fue corregida sin llamar demasiado la atenci\u00f3n en la actualizaci\u00f3n de LibreOffice 6.2.5, lanzada el 1 de julio, pero parece que el problema no fue completamente abordado (solo se bloque\u00f3 la invocaci\u00f3n de LibreLogo desde macros) y quedan sin resolver<\/a><\/noindex> algunos otros vectores de ataque. Adem\u00e1s, el problema no se solucion\u00f3 en la versi\u00f3n 6.1.6, recomendada para usuarios corporativos. Se espera que la vulnerabilidad sea completamente eliminada en la versi\u00f3n de LibreOffice 6.3, que se lanzar\u00e1 la pr\u00f3xima semana. Hasta que se publique la actualizaci\u00f3n completa, se recomienda a los usuarios deshabilitar expl\u00edcitamente el componente LibreLogo, que por defecto est\u00e1 disponible en muchas distribuciones. La vulnerabilidad ha sido parcialmente mitigada en Debian<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE\/openSUSE<\/a><\/noindex> y Ubuntu<\/a><\/noindex>.<\/p>\n

<\/a><\/noindex><\/p>\n

Fuente: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043e\u0444\u0438\u0441\u043d\u043e\u043c \u043f\u0430\u043a\u0435\u0442\u0435 LibreOffice \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-9848), \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u043b\u044c\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043e\u0442\u043a\u0440\u044b\u0442\u0438\u0438 \u0434\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u043e\u0432, \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u043e\u043c. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442 LibreLogo, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044e \u0438 \u0432\u0441\u0442\u0430\u0432\u043a\u0438 \u0432\u0435\u043a\u0442\u043e\u0440\u043d\u044b\u0445 \u0440\u0438\u0441\u0443\u043d\u043a\u043e\u0432, \u0442\u0440\u0430\u043d\u0441\u043b\u0438\u0440\u0443\u0435\u0442 \u0441\u0432\u043e\u0438 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 \u0432 \u043a\u043e\u0434 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python. \u0418\u043c\u0435\u044f \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0438 LibreLogo \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u043c\u043e\u0436\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043b\u044e\u0431\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Python […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27546,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-36775","post","type-post","status-publish","format-standard","has-post-thumbnail","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\udd47Vulnerabilidad en LibreOffice que permite ejecutar c\u00f3digo al abrir 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