Investigadores de las empresas Claroty y JFrog publicaron los resultados de una auditor\u00eda de seguridad del paquete BusyBox, ampliamente utilizado en dispositivos integrados y que ofrece un conjunto de utilidades est\u00e1ndar de UNIX, presentadas en un \u00fanico archivo ejecutable. Durante la revisi\u00f3n se encontraron 14 vulnerabilidades, que ya han sido corregidas en la versi\u00f3n de agosto de BusyBox 1.34. Casi todos los problemas son de bajo riesgo y cuestionables en cuanto a su aplicaci\u00f3n en ataques reales, ya que requieren la ejecuci\u00f3n de utilidades con argumentos proporcionados externamente. <\/p>\n
Se destaca una vulnerabilidad, CVE-2021-42374, que permite provocar una denegaci\u00f3n de servicio al procesar un archivo comprimido especialmente dise\u00f1ado utilizando la utilidad unlzma, y en caso de compilar con las opciones CONFIG_FEATURE_SEAMLESS_LZMA, tambi\u00e9n por cualquier otro componente de BusyBox, incluyendo tar, unzip, rpm, dpkg, lzma y man. <\/p>\n
Las vulnerabilidades CVE-2021-42373, CVE-2021-42375, CVE-2021-42376 y CVE-2021-42377 permiten provocar una denegaci\u00f3n de servicio, pero requieren la ejecuci\u00f3n de las utilidades man, ash y hush con par\u00e1metros proporcionados por el atacante. Las vulnerabilidades desde CVE-2021-42378 hasta CVE-2021-42386 afectan a la utilidad awk y pueden potencialmente llevar a la ejecuci\u00f3n de c\u00f3digo, pero para ello el atacante debe lograr que awk ejecute un determinado patr\u00f3n (es necesario ejecutar awk pasando como primer argumento de la l\u00ednea de comandos datos obtenidos del atacante). <\/p>\n
Adem\u00e1s, se puede se\u00f1alar la vulnerabilidad (CVE-2021-43523) en las bibliotecas uclibc y uclibc-ng, relacionada con el hecho de que al acceder a las funciones gethostbyname(), getaddrinfo(), gethostbyaddr() y getnameinfo() no se realiza la verificaci\u00f3n y limpieza del nombre de dominio devuelto por el servidor DNS. Por ejemplo, en respuesta a una determinada solicitud de resoluci\u00f3n, un servidor DNS controlado por un atacante puede devolver hosts del tipo «<script>alert(‘xss’)<\\\/script>.attacker.com» y estos ser\u00e1n devueltos tal cual a alg\u00fan programa, que sin limpieza podr\u00eda mostrarlos en su interfaz web. El problema fue solucionado en la versi\u00f3n uclibc-ng 1.0.39 mediante la adici\u00f3n de c\u00f3digo para verificar la validez de lo devuelto. de nombres de dominio<\/a>, implementado de manera similar a Glibc. \u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0439 Claroty \u0438 JFrog \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0430\u0443\u0434\u0438\u0442\u0430 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 BusyBox, \u0448\u0438\u0440\u043e\u043a\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u043e\u0433\u043e \u0432\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u0445 \u0438 \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0433\u043e \u043d\u0430\u0431\u043e\u0440 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0445 \u0443\u0442\u0438\u043b\u0438\u0442 UNIX, \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 \u0432 \u0432\u0438\u0434\u0435 \u0435\u0434\u0438\u043d\u043e\u0433\u043e \u0438\u0441\u043f\u043e\u043b\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u0444\u0430\u0439\u043b\u0430. \u0412 \u0445\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e 14 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0443\u0436\u0435 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u044b \u0432 \u0430\u0432\u0433\u0443\u0441\u0442\u043e\u0432\u0441\u043a\u043e\u043c \u0432\u044b\u043f\u0443\u0441\u043a\u0435 BusyBox 1.34. \u041f\u043e\u0447\u0442\u0438 \u0432\u0441\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043d\u0435\u043e\u043f\u0430\u0441\u043d\u044b \u0438 \u0441\u043e\u043c\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b \u0441 \u0442\u043e\u0447\u043a\u0438 \u0437\u0440\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u044b\u0445 […]<\/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-102257","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\udd47El an\u00e1lisis de seguridad del paquete BusyBox identific\u00f3 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"