{"id":53107,"date":"2019-11-24T00:00:00","date_gmt":"2019-11-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc"},"modified":"2020-02-18T14:00:58","modified_gmt":"2020-02-18T11:00:58","slug":"37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/37-uyazvimostej-v-razlichnyh-realizatsiyah-vnc","title":{"rendered":"37 vulnerabilidades en diversas implementaciones de VNC","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pavel Cheremushkin del Laboratorio Kaspersky analiz\u00f3<\/a><\/noindex> diversas implementaciones del sistema de acceso remoto VNC (Virtual Network Computing) y encontr\u00f3 37 vulnerabilidades ocasionadas por problemas en el manejo de la memoria. Las vulnerabilidades halladas en las implementaciones de los servidores VNC solo pueden ser explotadas por un usuario autenticado, mientras que los ataques a las vulnerabilidades en el c\u00f3digo cliente pueden ser posibles al conectar al usuario a un servidor controlado por un atacante.<\/p>\n

El mayor n\u00famero de vulnerabilidades se ha encontrado en el paquete UltraVNC<\/a><\/noindex>, disponible solo para la plataforma Windows. En total, se han identificado 22 vulnerabilidades en UltraVNC. 13 de estas vulnerabilidades pueden potencialmente llevar a la ejecuci\u00f3n de c\u00f3digo en el sistema, 5 a la filtraci\u00f3n de contenido de \u00e1reas de memoria y 4 a la denegaci\u00f3n de servicio.
\nLas vulnerabilidades han sido corregidas en la versi\u00f3n 1.2.3.0<\/a><\/noindex>.<\/p>\n

En la biblioteca abierta LibVNC<\/a><\/noindex> (LibVNCServer y LibVNCClient), que se utiliza<\/a><\/noindex> en VirtualBox, se encontraron 10 vulnerabilidades.
\n5 vulnerabilidades (CVE-2018-20020<\/a><\/noindex>, CVE-2018-20019<\/a><\/noindex>, CVE-2018-15127<\/a><\/noindex>, CVE-2018-15126<\/a><\/noindex>, CVE-2018-6307<\/a><\/noindex>) son causadas por desbordamientos de b\u00fafer y pueden potencialmente llevar a la ejecuci\u00f3n de c\u00f3digo. 3 vulnerabilidades pueden llevar a la filtraci\u00f3n de informaci\u00f3n, y 2 a la denegaci\u00f3n de servicio.
\nTodos los problemas ya han sido solucionados por los desarrolladores, pero los cambios a\u00fan se reflejan<\/a><\/noindex> solo en la rama master.<\/p>\n

En TightVNC<\/a><\/noindex> (se prob\u00f3 la rama obsoleta multiplataforma, 1.3<\/a><\/noindex>ya que la versi\u00f3n actual 2.x solo se lanza para Windows), se encontraron 4 vulnerabilidades. Tres problemas (CVE-2019-15679<\/a><\/noindex>, CVE-2019-15678<\/a><\/noindex>, CVE-2019-8287<\/a><\/noindex>) son causadas por desbordamientos de b\u00fafer en las funciones InitialiseRFBConnection, rfbServerCutText y HandleCoRREBBP, y pueden potencialmente llevar a la ejecuci\u00f3n de c\u00f3digo. Un problema (CVE-2019-15680<\/a><\/noindex>) puede llevar a la denegaci\u00f3n de servicio. A pesar de que los desarrolladores de TightVNC fueron informados<\/a><\/noindex> informados sobre los problemas el a\u00f1o pasado, las vulnerabilidades a\u00fan permanecen sin resolver.<\/p>\n

En el paquete multiplataforma TurboVNC<\/a><\/noindex> (fork de TightVNC 1.3 que usa la biblioteca libjpeg-turbo), se hall\u00f3 solo una vulnerabilidad (CVE-2019-15683<\/a><\/noindex>), pero es peligrosa y, al tener acceso autenticado al servidor, permite la ejecuci\u00f3n de su propio c\u00f3digo, ya que en el desbordamiento de b\u00fafer se puede controlar la direcci\u00f3n de retorno. El problema fue solucionado el 23 de agosto<\/a><\/noindex> y no se presenta en la versi\u00f3n actual 2.2.3<\/a><\/noindex>.<\/p>\n

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

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

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