{"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\/pl\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"Vulnerability w implementacji gniazd AF_PACKET j\u0105dra Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Min\u0119\u0142y trzy lata od chwili, gdy pojawi\u0142a si\u0119 fala podatno\u015bci (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) w podsystemie AF_PACKET j\u0105dra Linux wykryto<\/a><\/noindex> kolejny problem (CVE-2020-14386<\/a><\/noindex>), kt\u00f3ry pozwala lokalnemu u\u017cytkownikowi bez uprawnie\u0144 na wykonanie kodu z prawami root lub wydostanie si\u0119 z izolowanych kontener\u00f3w, maj\u0105c w nich dost\u0119p do root.<\/p>\n

Aby utworzy\u0107 gniazdo AF_PACKET i wykorzysta\u0107 podatno\u015b\u0107, wymagane s\u0105 uprawnienia CAP_NET_RAW. Niemniej jednak, to uprawnienie mo\u017ce zosta\u0107 przyznane nieuprzywilejowanemu u\u017cytkownikowi w kontenerach, tworzonych w systemach z w\u0142\u0105czon\u0105 obs\u0142ug\u0105 przestrzeni nazw identyfikator\u00f3w u\u017cytkownik\u00f3w (user namespaces). Na przyk\u0142ad, przestrzenie nazw u\u017cytkownik\u00f3w s\u0105 domy\u015blnie w\u0142\u0105czone w Ubuntu i Fedory, ale nieaktywowana w Debianie i RHEL. W Androidzie prawo do tworzenia gniazd AF_PACKET ma proces mediaserver, przez kt\u00f3ry mo\u017cna wykorzysta\u0107 podatno\u015b\u0107.<\/p>\n

Podatno\u015b\u0107 wyst\u0119puje w funkcji tpacket_rcv i jest spowodowana b\u0142\u0119dem obliczania zmiennej netoff. Atakuj\u0105cy mo\u017ce stworzy\u0107 warunki, w kt\u00f3rych do zmiennej netoff zostanie zapisane warto\u015b\u0107 mniejsza od zmiennej maclen, co spowoduje przepe\u0142nienie podczas obliczania \u201emacoff = netoff \u2014 maclen\u201d i b\u0142\u0119dne dalsze ustawienie wska\u017anika na bufor dla nadchodz\u0105cych danych. W rezultacie atakuj\u0105cy mo\u017ce zainicjowa\u0107 zapis od 1 do 10 bajt\u00f3w w obszarze poza przydzielonym buforem. Zg\u0142asza si\u0119, \u017ce opracowywany jest exploit, kt\u00f3ry pozwala uzyska\u0107 prawa root w systemie. <\/p>\n

Problem wyst\u0119puje w j\u0105drze od lipca 2008 roku, tj. pojawia si\u0119 w wszystkich aktualnych j\u0105drach. \u0141atka obecnie dost\u0119pna jest w postaci \u0142atki<\/a><\/noindex>. \u015aledzi\u0107 pojawienie si\u0119 aktualizacji pakiet\u00f3w w dystrybucjach mo\u017cna na nast\u0119puj\u0105cych stronach: Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

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

\u0179r\u00f3d\u0142o: 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\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\udd47Luka w implementacji gniazd AF_PACKET j\u0105dra Linux | ProHoster","description":"Min\u0119\u0142y trzy lata od momentu pojawienia si\u0119 fali podatno\u015bci (1,","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","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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