{"id":93183,"date":"2020-09-04T07:42:02","date_gmt":"2020-09-04T05:42:02","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux"},"modified":"2020-09-04T07:42:02","modified_gmt":"2020-09-04T05:42:02","slug":"uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"Hiba az AF_PACKET socketek megval\u00f3s\u00edt\u00e1s\u00e1ban a Linux kernelben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

H\u00e1rom \u00e9vvel a sebezhet\u0151s\u00e9gi hull\u00e1m ut\u00e1n (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) a Linux kernel AF_PACKET alrendszer\u00e9ben identified<\/a><\/noindex> \u00fajabb probl\u00e9ma (CVE-2020-14386<\/a><\/noindex>), amely lehet\u0151v\u00e9 teszi, hogy egy nem privilegiz\u00e1lt lok\u00e1lis felhaszn\u00e1l\u00f3 k\u00f3dot hajtson v\u00e9gre root jogokkal vagy kil\u00e9pjen az elk\u00fcl\u00f6n\u00edtett kont\u00e9nerekb\u0151l, ha azokban root hozz\u00e1f\u00e9r\u00e9s van.<\/p>\n

AF_PACKET socket l\u00e9trehoz\u00e1s\u00e1hoz \u00e9s a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1hoz CAP_NET_RAW jogosults\u00e1g sz\u00fcks\u00e9ges. Azonban ez a jogosults\u00e1g megszerezhet\u0151 nem privilegiz\u00e1lt felhaszn\u00e1l\u00f3k sz\u00e1m\u00e1ra olyan kont\u00e9nerekben, amelyek felhaszn\u00e1l\u00f3i n\u00e9vt\u00e9r t\u00e1mogat\u00e1ssal (user namespaces) l\u00e9trej\u00f6nnek. P\u00e9ld\u00e1ul az Ubuntu \u00e9s a Fedora alap\u00e9rtelmezetten enged\u00e9lyezett a user namespaces, m\u00edg a Debianban \u00e9s a RHEL-ben nem aktiv\u00e1lt\u00e1k. Az Androidon az AF_PACKET socket l\u00e9trehoz\u00e1s\u00e1hoz a mediaserver folyamatnak vannak jogai, amelyen kereszt\u00fcl a sebezhet\u0151s\u00e9g kihaszn\u00e1lhat\u00f3.<\/p>\n

A sebezhet\u0151s\u00e9g a tpacket_rcv funkci\u00f3ban van jelen, \u00e9s a netoff v\u00e1ltoz\u00f3 sz\u00e1m\u00edt\u00e1si hib\u00e1j\u00e1b\u00f3l ered. A t\u00e1mad\u00f3 olyan k\u00f6r\u00fclm\u00e9nyeket teremt, amelyek sor\u00e1n a netoff v\u00e1ltoz\u00f3ba kevesebb \u00e9rt\u00e9k ker\u00fcl, mint a maclen, ami t\u00falcsordul\u00e1st okoz a \u201emacoff = netoff - maclen\u201d sz\u00e1m\u00edt\u00e1s\u00e1n\u00e1l, \u00e9s hib\u00e1sen \u00e1ll\u00edtja be a mutat\u00f3t a bej\u00f6v\u0151 adatok puffere sz\u00e1m\u00e1ra. Ennek eredm\u00e9nyek\u00e9nt a t\u00e1mad\u00f3k 1 \u00e9s 10 b\u00e1jt k\u00f6z\u00f6tti adatokat \u00edrhatnak a lefoglalt puffer ter\u00fclet\u00e9n k\u00edv\u00fclre. Megjegyzend\u0151, hogy egy olyan exploit fejleszt\u00e9se folyamatban van, amely root jogosults\u00e1gokat szerezhet a rendszerben. <\/p>\n

A probl\u00e9ma a kernelben 2008 j\u00faliusa \u00f3ta, azaz minden aktu\u00e1lis kernelben jelen van. A jav\u00edt\u00e1s egyel\u0151re el\u00e9rhet\u0151 form\u00e1ban patch form\u00e1j\u00e1ban<\/a><\/noindex>. A csomagfriss\u00edt\u00e9sek megjelen\u00e9s\u00e9t a disztrib\u00faci\u00f3kban az al\u00e1bbi oldalakon lehet nyomon k\u00f6vetni: Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

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

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0421\u043f\u0443\u0441\u0442\u044f \u0442\u0440\u0438 \u0433\u043e\u0434\u0430 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u0432\u043e\u043b\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 (1, 2, 3, 4, 5) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 AF_PACKET \u044f\u0434\u0440\u0430 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0435\u0449\u0451 \u043e\u0434\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 (CVE-2020-14386), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u044c \u043a\u043e\u0434 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0438\u043b\u0438 \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u043e\u0432, \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u0432 \u043d\u0438\u0445 root-\u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0414\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0441\u043e\u043a\u0435\u0442\u0430 AF_PACKET \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u043f\u043e\u043b\u043d\u043e\u043c\u043e\u0447\u0438\u0439 CAP_NET_RAW. \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, […]<\/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-93183","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\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\udd47AF_PACKET socket sebezhet\u0151s\u00e9g a Linux kernelben | ProHoster","description":"H\u00e1rom \u00e9vvel a sebezhet\u0151s\u00e9gi hull\u00e1m ut\u00e1n (1,","canonical_url":"https:\/\/prohoster.info\/hu\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hu_HU","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u043e\u043a\u0435\u0442\u043e\u0432 AF_PACKET \u044f\u0434\u0440\u0430 Linux | ProHoster","og:description":"\u0421\u043f\u0443\u0441\u0442\u044f \u0442\u0440\u0438 \u0433\u043e\u0434\u0430 \u0441 \u043c\u043e\u043c\u0435\u043d\u0442\u0430 \u0432\u043e\u043b\u043d\u044b \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 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