{"id":41185,"date":"2020-02-06T14:41:55","date_gmt":"2020-02-06T11:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/openwrt-19-07-1"},"modified":"2020-02-06T14:41:55","modified_gmt":"2020-02-06T11:41:55","slug":"openwrt-19-07-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/openwrt-19-07-1","title":{"rendered":"OpenWrt 19.07.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><a rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/images\/18933\/original.png\" itemprop=\"contentURL\"><br \/>\n      <img decoding=\"async\" alt=\"OpenWrt 19.07.1\" src=\"\/wp-content\/uploads\/2020\/02\/8383caa7e1555731c336d42797b1288a.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>    <\/a><\/p>\n<p><noindex>      <noindex><\/p>\n<p>Se han lanzado versiones del distribuidor OpenWrt <a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021541.html\">18.06.7<\/a> y <a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021543.html\">19.07.1<\/a>, en las que se corrige <a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021544.html\">vulnerabilidad<\/a> CVE-2020-7982 en el gestor de paquetes opkg, que permit\u00eda realizar un ataque MITM y reemplazar el contenido de los paquetes descargados del repositorio. Debido a un error en el c\u00f3digo de verificaci\u00f3n de sumas de comprobaci\u00f3n, un atacante pod\u00eda ignorar las sumas de comprobaci\u00f3n SHA-256 del paquete, lo que permit\u00eda eludir los mecanismos de verificaci\u00f3n de integridad de los recursos ipk descargados.<\/p>\n<p><\/noindex><noindex><\/p>\n<p>El problema existe desde febrero de 2017, despu\u00e9s de que se a\u00f1adiera c\u00f3digo para ignorar los espacios en blanco iniciales que preceden a la suma de comprobaci\u00f3n. Debido a un error al omitir los espacios, el puntero de posici\u00f3n en la cadena no se mov\u00eda y el bucle de decodificaci\u00f3n de la secuencia hexadecimal SHA-256 devolv\u00eda inmediatamente el control, proporcionando una suma de comprobaci\u00f3n de longitud cero.<\/p>\n<p>Debido a que el gestor de paquetes opkg se ejecutaba como root, un atacante pod\u00eda modificar el contenido del paquete ipk durante la organizaci\u00f3n de un ataque MITM, que se descargaba del repositorio al ejecutar el comando &#171;opkg install&#187;, y lograr la ejecuci\u00f3n de su c\u00f3digo con privilegios de root a trav\u00e9s de la adici\u00f3n de sus propios scripts de manejo en el paquete, que se invocaban durante la instalaci\u00f3n. Para aprovechar la vulnerabilidad, el atacante tambi\u00e9n deb\u00eda reemplazar el \u00edndice de paquetes (por ejemplo, el proporcionado por downloads.openwrt.org). El tama\u00f1o del paquete modificado debe coincidir con el original, seg\u00fan el \u00edndice.<\/p>\n<p>En las nuevas versiones tambi\u00e9n se ha solucionado otro <a rel=\"nofollow\" href=\"https:\/\/lists.infradead.org\/pipermail\/openwrt-devel\/2020-January\/021545.html\">vulnerabilidad<\/a> en la biblioteca libubox, que puede provocar un desbordamiento de b\u00fafer al procesar datos binarios serializados o datos en formato JSON en la funci\u00f3n blobmsg_format_json. <\/p>\n<p><\/noindex><\/noindex><\/p>\n<p>Fuente: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/linux-general\/15505380\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u044b\u043f\u0443\u0449\u0435\u043d\u044b \u0432\u0435\u0440\u0441\u0438\u0438 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u0430 OpenWrt 18.06.7 \u0438 19.07.1, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c CVE-2020-7982 \u0432 \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 opkg, \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u043c\u043e\u0436\u043d\u043e \u0431\u044b\u043b\u043e \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0438\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443 \u0438 \u0437\u0430\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u043e\u0433\u043e \u0438\u0437 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u044f \u043f\u0430\u043a\u0435\u0442\u0430. \u0418\u0437-\u0437\u0430 \u043e\u0448\u0438\u0431\u043a\u0438 \u0432 \u043a\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0445 \u0441\u0443\u043c\u043c, \u0430\u0442\u0430\u043a\u0443\u044e\u0449\u0438\u0439 \u043c\u043e\u0433 \u043f\u0440\u043e\u0438\u0433\u043d\u043e\u0440\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c\u043d\u044b\u0435 \u0441\u0443\u043c\u043c\u044b SHA-256 \u0438\u0437 \u043f\u0430\u043a\u0435\u0442\u0430, \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u043b\u043e \u043e\u0431\u043e\u0439\u0442\u0438 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u044b \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0446\u0435\u043b\u043e\u0441\u0442\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u044b\u0445 ipk-\u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":41186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-41185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/es\/blog\/openwrt-19-07-1\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.2\" \/>\n\t\t<meta property=\"og:locale\" content=\"es_ES\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 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