{"id":40697,"date":"2020-02-03T14:36:04","date_gmt":"2020-02-03T11:36:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov"},"modified":"2020-02-03T14:36:04","modified_gmt":"2020-02-03T11:36:04","slug":"obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/obnovlenie-openwrt-19-07-1-s-ustraneniem-uyazvimosti-dopuskayushhej-podmenu-paketov","title":{"rendered":"Actualizaci\u00f3n de OpenWrt 19.07.1 con una soluci\u00f3n a la vulnerabilidad que permite la suplantaci\u00f3n de paquetes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Se han publicado versiones correctivas de la distribuci\u00f3n OpenWrt 18.06.7<\/a><\/noindex> y 19.07.1<\/a><\/noindex>, que corrigen una vulnerabilidad cr\u00edtica<\/a><\/noindex> (CVE-2020-7982) en el gestor de paquetes opkg<\/a><\/noindex>, lo que permite llevar a cabo un ataque MITM y modificar el contenido del paquete descargado del repositorio. Debido a un error en el c\u00f3digo de verificaci\u00f3n de sumas de verificaci\u00f3n, un atacante puede crear condiciones en las que las sumas de verificaci\u00f3n SHA-256, presentes en el \u00edndice de paquetes firmado digitalmente, ser\u00e1n ignoradas, lo que permite eludir los mecanismos de verificaci\u00f3n de integridad de los recursos ipk descargados.<\/p>\n

El problema se ha manifestado desde febrero de 2017, despu\u00e9s de la adici\u00f3n<\/a><\/noindex> de c\u00f3digo para ignorar los espacios iniciales que preceden a la suma de verificaci\u00f3n. Debido a un error al omitir los espacios, el puntero en la posici\u00f3n de la cadena no se desplazaba y el ciclo de decodificaci\u00f3n de la secuencia hexadecimal SHA-256 devolv\u00eda inmediatamente el control, produciendo una suma de verificaci\u00f3n de longitud cero. <\/p>\n

Dado que el gestor de paquetes opkg en OpenWrt se ejecuta con privilegios de root, en caso de un ataque MITM, un atacante puede modificar de forma oculta el paquete ipk que se descarga del repositorio durante la ejecuci\u00f3n del comando «opkg install» por el usuario, y ejecutar su c\u00f3digo con privilegios de root al a\u00f1adir scripts manejadores al paquete que se invoquen durante la instalaci\u00f3n. Para explotar la vulnerabilidad, el atacante tambi\u00e9n debe sustituir el \u00edndice de paquetes correcto y firmado (por ejemplo, el que se entrega desde downloads.openwrt.org). El tama\u00f1o del paquete modificado debe coincidir con el tama\u00f1o original establecido en el \u00edndice.<\/p>\n

En situaciones donde es necesario evitar la actualizaci\u00f3n de todo el firmware, se puede actualizar \u00fanicamente el gestor de paquetes opkg, ejecutando los siguientes comandos:<\/p>\n

cd \/tmp
\n opkg update
\n opkg download opkg
\n zcat .\\\/opkg-lists\\\/openwrt_base | grep -A10 «Package: opkg» | grep SHA256sum
\n sha256sum .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n

A continuaci\u00f3n, se deben comparar las sumas de verificaci\u00f3n mostradas y, si coinciden, ejecutar:<\/p>\n

opkg install .\/opkg_2020-01-25-c09fe209-1_*.ipk<\/p>\n

En las nuevas versiones tambi\u00e9n se ha solucionado otro vulnerabilidad<\/a><\/noindex> en la biblioteca libubox<\/a><\/noindex>, lo que puede provocar un desbordamiento de b\u00fafer al procesar en la funci\u00f3n blobmsg_format_json<\/a><\/noindex> de datos binarios serializados especialmente formateados o datos en formato JSON. La biblioteca se utiliza en componentes de la distribuci\u00f3n como netifd, procd, ubus, rpcd y uhttpd, as\u00ed como en el paquete auc<\/a><\/noindex> (Actualizaci\u00f3n del sistema Attended CLI). Un desbordamiento de b\u00fafer ocurre al transmitir grandes atributos num\u00e9ricos del tipo «double» en bloques blob. Se puede verificar la vulnerabilidad del sistema ejecutando el comando:<\/p>\n

$ ubus call luci getFeatures \
\n ‘{ «banik»: 00192200197600198000198100200400.1922 }’<\/p>\n

Adem\u00e1s de corregir vulnerabilidades y solucionar errores acumulados en la versi\u00f3n OpenWrt 19.07.1, tambi\u00e9n se ha actualizado la versi\u00f3n del n\u00facleo de Linux (de 4.14.162 a 4.14.167), resolviendo problemas de rendimiento al usar frecuencias de 5GHz, se ha establecido el soporte para dispositivos Ubiquiti Rocket M Titanium, Netgear WN2500RP v1,
\n Zyxel NSA325, Netgear WNR3500 V2, Archer C6 v2, Ubiquiti EdgeRouter-X, Archer C20 v4, Archer C50 v4, Archer MR200, TL-WA801ND v5, HiWiFi HC5962, Xiaomi Mi Router 3 Pro y Netgear R6350.<\/p>\n

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

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

\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0435 \u0432\u044b\u043f\u0443\u0441\u043a\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 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7982) \u0432 \u043f\u0430\u043a\u0435\u0442\u043d\u043e\u043c \u043c\u0435\u043d\u0435\u0434\u0436\u0435\u0440\u0435 opkg, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043e\u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0438\u0442\u044c MITM-\u0430\u0442\u0430\u043a\u0443 \u0438 \u043f\u043e\u0434\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 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