{"id":74109,"date":"2020-03-14T08:42:14","date_gmt":"2020-03-14T05:42:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya"},"modified":"2020-03-14T08:42:14","modified_gmt":"2020-03-14T05:42:14","slug":"loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/loadlibrary-proslojka-dlya-zagruzki-windows-dll-v-linux-prilozheniya","title":{"rendered":"LoadLibrary, una capa para cargar DLL de Windows en aplicaciones de Linux.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Tavis Ormandy (Tavis Ormandy<\/a><\/noindex>), investigador de seguridad de Google, est\u00e1 desarrollando un proyecto LoadLibrary<\/a><\/noindex>, destinado a portar bibliotecas DLL recopiladas para Windows para su uso en aplicaciones para Linux. El proyecto proporciona una biblioteca intermedia que permite cargar un archivo DLL en formato PE\/COFF y llamar a funciones espec\u00edficas contenidas en \u00e9l. El cargador PE\/COFF se basa en el c\u00f3digo de ndiswrapper<\/a><\/noindex>. El c\u00f3digo del proyecto se distribuye<\/a><\/noindex> bajo la licencia GPLv2.<\/p>\n

LoadLibrary se encarga de las funciones de carga de la biblioteca en memoria e importaci\u00f3n de los s\u00edmbolos disponibles, proporcionando a la aplicaci\u00f3n Linux una API al estilo de dlopen. El c\u00f3digo plugable se puede depurar utilizando gdb, ASAN y Valgrind. Se prev\u00e9 la posibilidad de modificar el c\u00f3digo ejecutable en tiempo de ejecuci\u00f3n mediante la conexi\u00f3n de hooks y la aplicaci\u00f3n de parches (runtime patching). Se soporta el manejo y deshacer (unwinding) excepciones para C++.<\/p>\n

El objetivo del proyecto es organizar pruebas fuzzing distribuidas escalables y eficientes para bibliotecas DLL en un entorno basado en Linux. En Windows, la realizaci\u00f3n de pruebas de fuzzing y cobertura no permite alcanzar la eficacia adecuada y a menudo requiere ejecutar una instancia virtualizada separada de Windows, especialmente al intentar analizar productos complejos, como software antivirus, que abarcan la operaci\u00f3n a nivel de n\u00facleo y de espacio de usuario. Con LoadLibrary, los investigadores de Google est\u00e1n buscando vulnerabilidades en c\u00f3decs de video, esc\u00e1neres antivirus, bibliotecas de descompresi\u00f3n de datos, decodificadores de im\u00e1genes, etc. <\/p>\n

Por ejemplo, con LoadLibrary se logr\u00f3 portar el motor antivirus Windows Defender para su ejecuci\u00f3n en Linux. El estudio de mpengine.dll, que es el n\u00facleo de Windows Defender, permiti\u00f3 analizar un gran n\u00famero de controladores complejos de varios formatos, emuladores de sistemas de archivos e int\u00e9rpretes de lenguajes, que potencialmente ofrecen vectores para posibles<\/a><\/noindex> ataques?<\/a><\/noindex>.<\/p>\n

LoadLibrary tambi\u00e9n se utiliz\u00f3 para identificar una vulnerabilidad remota<\/a><\/noindex> en el paquete antivirus Avast. Al analizar el DLL de este antivirus, se descubri\u00f3 que el proceso de escaneo privilegiado clave incluye un int\u00e9rprete JavaScript completo, utilizado para emular la ejecuci\u00f3n de c\u00f3digo JavaScript externo. Este proceso no est\u00e1 aislado en un entorno sandbox, no reduce privilegios y realiza el an\u00e1lisis de datos externos no verificados del sistema de archivos y del tr\u00e1fico de red interceptado. Dado que cualquier vulnerabilidad en este proceso complicado y no protegido puede potencialmente llevar a la compromisi\u00f3n remota de todo el sistema, se desarroll\u00f3 una capa especial basada en LoadLibrary. avscript<\/a><\/noindex> para analizar vulnerabilidades en el esc\u00e1ner antivirus Avast en un entorno basado en Linux.<\/p>\n

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

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

\u0422\u044d\u0432\u0438\u0441 \u041e\u0440\u043c\u0430\u043d\u0434\u0438 (Tavis Ormandy), \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 Google, \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u0442 \u043f\u0440\u043e\u0435\u043a\u0442 LoadLibrary, \u043d\u0430\u0446\u0435\u043b\u0435\u043d\u043d\u044b\u0439 \u043d\u0430 \u043f\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0441\u043e\u0431\u0440\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f Windows DLL-\u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a \u0434\u043b\u044f \u0438\u0445 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445 \u0434\u043b\u044f Linux. \u041f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430-\u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0430, \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043c\u043e\u0436\u043d\u043e \u0437\u0430\u0433\u0440\u0443\u0437\u0438\u0442\u044c DLL-\u0444\u0430\u0439\u043b \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 PE\/COFF \u0438 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0435 \u0432 \u043d\u0451\u043c \u0444\u0443\u043d\u043a\u0446\u0438\u0438. \u0417\u0430\u0433\u0440\u0443\u0437\u0447\u0438\u043a PE\/COFF \u043e\u0441\u043d\u043e\u0432\u0430\u043d \u043d\u0430 \u043a\u043e\u0434\u0435 ndiswrapper. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 GPLv2. […]<\/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-74109","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\udd47LoadLibrary, una capa para cargar DLL de Windows en aplicaciones de Linux | ProHoster","description":"Tavis Ormandy, investigador de seguridad de Google, desarrolla el 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