{"id":32892,"date":"2019-10-31T21:49:35","date_gmt":"2019-10-31T18:49:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa\/"},"modified":"2019-10-31T21:49:35","modified_gmt":"2019-10-31T18:49:35","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa","title":{"rendered":"Luka w j\u0105drze Linuxa, kt\u00f3ra pozwala na wywo\u0142anie awarii poprzez wys\u0142anie pakietu UDP","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

W j\u0105drze Linux wykryto<\/a><\/noindex> vulnerabilno\u015b\u0107 (CVE-2019-11683<\/a><\/noindex>), kt\u00f3ra umo\u017cliwia zdalne wywo\u0142anie odmowy us\u0142ugi poprzez wysy\u0142anie specjalnie sformatowanych pakiet\u00f3w UDP (packet-of-death). Problem wynika z b\u0142\u0119du w obs\u0142udze udp_gro_receive_segment (net\/ipv4\/udp_offload.c) zwi\u0105zanym z implementacj\u0105 technologii GRO (Generic Receive Offload) i mo\u017ce prowadzi\u0107 do uszkodzenia zawarto\u015bci obszar\u00f3w pami\u0119ci j\u0105dra podczas przetwarzania pakiet\u00f3w UDP z zerowym wype\u0142nieniem (pusty payload).<\/p>\n

Problem dotyczy tylko j\u0105dra 5.0<\/a><\/noindex>, poniewa\u017c wsparcie GRO dla gniazd UDP zosta\u0142o zrealizowano<\/a><\/noindex> w listopadzie zesz\u0142ego roku i trafi\u0142o tylko do ostatniego stabilnego wydania j\u0105dra. Technologia GRO umo\u017cliwia przyspieszenie przetwarzania du\u017cej liczby przychodz\u0105cych pakiet\u00f3w poprzez agregowanie kilku pakiet\u00f3w w wi\u0119ksze bloki, kt\u00f3re nie wymagaj\u0105 osobnej obs\u0142ugi ka\u017cdego pakietu.
\nDla TCP problem si\u0119 nie ujawnia, poniewa\u017c dla tego protoko\u0142u nie wspiera si\u0119 agregacji pakiet\u00f3w bez payload.<\/p>\n

Luka zosta\u0142a na razie naprawiona tylko w postaci \u0142atki<\/a><\/noindex>, poprawka nie zosta\u0142a jeszcze opublikowana (wczorajsza aktualizacja 5.0.11 poprawka nie zosta\u0142a zawarta<\/a><\/noindex>). Z dystrybucji j\u0105dro 5.0 zd\u0105\u017cy\u0142o trafi\u0107 do Fedora 30<\/a><\/noindex>, Ubuntu 19.04<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Gentoo<\/a><\/noindex> i innych nieprzerwanie aktualizowanych dystrybucji. Debian<\/a><\/noindex>, Ubuntu 18.10 i starsze<\/a><\/noindex>, RHEL\/CentOS<\/a><\/noindex> i SUSE\/openSUSE<\/a><\/noindex> problem nie dotyczy.<\/p>\n

Problem zosta\u0142 znaleziony w wyniku u\u017cywania<\/a><\/noindex> stworzonych przez firm\u0119 Google zautomatyzowanych system\u00f3w fuzzing-testowania syzbot<\/a><\/noindex> i analizatora KASAN<\/a><\/noindex> (KernelAddressSanitizer), kt\u00f3ry ma na celu wykrywanie b\u0142\u0119d\u00f3w w obs\u0142udze pami\u0119ci oraz przypadk\u00f3w nieprawid\u0142owego dost\u0119pu do pami\u0119ci, takich jak dost\u0119p do zwolnionych obszar\u00f3w pami\u0119ci i umieszczanie kodu w obszarach pami\u0119ci, kt\u00f3re nie s\u0105 przeznaczone do takich manipulacji. <\/p>\n

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

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-11683), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043e\u0442\u043a\u0430\u0437 \u0432 \u043e\u0431\u0441\u043b\u0443\u0436\u0438\u0432\u0430\u043d\u0438\u0438 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u044b\u0445 UDP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 (packet-of-death). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0448\u0438\u0431\u043a\u043e\u0439 \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 udp_gro_receive_segment (net\/ipv4\/udp_offload.c) \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0442\u0435\u0445\u043d\u043e\u043b\u043e\u0433\u0438\u0438 GRO (Generic Receive \u041effload) \u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u043e\u0432\u0440\u0435\u0436\u0434\u0435\u043d\u0438\u044e \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 UDP-\u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0441 \u043d\u0443\u043b\u0435\u0432\u044b\u043c \u0437\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c (\u043f\u0443\u0441\u0442\u043e\u0439 payload). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e \u044f\u0434\u0440\u043e 5.0, \u0442\u0430\u043a […]<\/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-32892","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 j\u0105drze Linux, umo\u017cliwiaj\u0105ca awari\u0119 przez wys\u0142anie pakietu UDP | ProHoster","description":"W j\u0105drze Linux zidentyfikowano luk\u0119 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