{"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\/fr\/blog\/openwrt-19-07-1","title":{"rendered":"OpenWrt 19.07.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"


\n \"OpenWrt<\/p>\n

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

<\/p>\n

Des versions de la distribution OpenWrt ont \u00e9t\u00e9 publi\u00e9es 18.06.7<\/a> et 19.07.1<\/a>, dans lesquelles est corrig\u00e9e CVE-2020-10174<\/a> la CVE-2020-7982 dans le gestionnaire de paquets opkg, qui permettait une attaque MITM et la substitution du contenu t\u00e9l\u00e9charg\u00e9 depuis le d\u00e9p\u00f4t. En raison d'une erreur dans le code de v\u00e9rification des sommes de contr\u00f4le, un attaquant pouvait ignorer les sommes de contr\u00f4le SHA-256 du paquet, ce qui permettait de contourner les m\u00e9canismes de v\u00e9rification de l'int\u00e9grit\u00e9 des ressources ipk t\u00e9l\u00e9charg\u00e9es.<\/p>\n

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

Le probl\u00e8me existe depuis f\u00e9vrier 2017, apr\u00e8s que du code a \u00e9t\u00e9 ajout\u00e9 pour ignorer les espaces initiaux qui pr\u00e9c\u00e8dent la somme de contr\u00f4le. En raison d'une erreur lors du saut des espaces, le pointeur n'\u00e9tait pas d\u00e9cal\u00e9 \u00e0 la position dans la cha\u00eene et la boucle de d\u00e9codage de la s\u00e9quence hexad\u00e9cimale SHA-256 retournait imm\u00e9diatement le contr\u00f4le, renvoyant une somme de contr\u00f4le de longueur nulle.<\/p>\n

En raison du fait que le gestionnaire de packages opkg \u00e9tait ex\u00e9cut\u00e9 sous l'utilisateur root, un attaquant pouvait modifier le contenu du paquet ipk pendant une attaque MITM, en le t\u00e9l\u00e9chargeant depuis le d\u00e9p\u00f4t au cours de l'ex\u00e9cution de la commande «opkg install», et organiser l'ex\u00e9cution de son code avec les droits root en ajoutant ses propres scripts de traitement au paquet, qui seraient appel\u00e9s lors de l'installation. Pour exploiter cette vuln\u00e9rabilit\u00e9, l'attaquant devait \u00e9galement alt\u00e9rer l'index des paquets (par exemple, en le r\u00e9cup\u00e9rant depuis downloads.openwrt.org). La taille du paquet modifi\u00e9 devait correspondre \u00e0 celle de l'original, selon l'index.<\/p>\n

Dans les nouvelles versions, un autre probl\u00e8me a \u00e9galement \u00e9t\u00e9 r\u00e9solu CVE-2020-10174<\/a> dans la biblioth\u00e8que libubox, ce qui peut entra\u00eener un d\u00e9bordement de tampon lors du traitement dans la fonction blobmsg_format_json de donn\u00e9es binaires s\u00e9rialis\u00e9es sp\u00e9cifiquement format\u00e9es ou de donn\u00e9es au format JSON. <\/p>\n

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

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

\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 […]<\/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\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\n","aioseo_head_json":{"title":"\ud83e\udd47OpenWrt 19.07.1 | 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