{"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\/et\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-vyzvat-krah-cherez-otpravku-udp-paketa","title":{"rendered":"Linuxi tuumas avatud haavatavus, mis v\u00f5imaldab kokkuvarisemist UDP-paketti saatmise kaudu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuum tuvastatud<\/a><\/noindex> haavatavus (CVE-2019-11683<\/a><\/noindex>), mis v\u00f5imaldab kaugjuhtimise teel tekitada teenusekatkestuse, saates spetsiaalselt vormistatud UDP-pakette (packet-of-death). Probleem on p\u00f5hjustatud veast udp_gro_receive_segment t\u00f6\u00f6tlejas (net\/ipv4\/udp_offload.c), millel on GRO (Generic Receive Offload) tehnoloogia rakendus ja see v\u00f5ib viia tuuma m\u00e4lu alade sisu kahjustumiseni, t\u00f6\u00f6tledes UDP-pakette, mille t\u00e4itmine on null (t\u00fchi payload).<\/p>\n

Probleem m\u00f5jutab ainult tuuma 5.0<\/a><\/noindex>, kuna UDP-soketite jaoks ei olnud GRO tuge rakendatud<\/a><\/noindex> mullu novembris ja see j\u00f5udis ainult viimasesse stabiilsesse tuumav\u00e4ljaande. GRO tehnoloogia v\u00f5imaldab kiirendada suure hulga sissetulevate pakettide t\u00f6\u00f6tlemist, koondades mitmed paketid suurematesse plokkidesse, mis ei vaja iga paketi eraldi t\u00f6\u00f6tlemist.
\nTCP puhul probleem ei avaldu, kuna selle protokolli jaoks ei toetata paketide koondamist ilma payloadita.<\/p>\n

Haavatavus on praegu parandatud ainult kujul patch<\/a><\/noindex>, parandav uuendus ei ole veel avaldatud (eile avaldatud uuenduses 5.0.11 ei sisaldunud parandust ei kuulunud<\/a><\/noindex>). Tuhandeid versioone, kuhu on sisse viidud tuum 5.0, on j\u00f5udnud Fedora 30<\/a><\/noindex>, Ubuntu 19.04<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Gentoo<\/a><\/noindex> ja teistesse pidevalt v\u00e4rskendatavatesse distributsioonidesse. Debian<\/a><\/noindex>, Ubuntu 18.10 ja vanemad<\/a><\/noindex>, RHEL\\\/CentOS<\/a><\/noindex> ja SUSE\/openSUSE<\/a><\/noindex> probleem ei m\u00f5juta.<\/p>\n

Probleem avastati Google'i loodud automatiseeritud fuzzing-testimise tulemuste anal\u00fc\u00fcsi k\u00e4igus kasutamist<\/a><\/noindex> ja anal\u00fcsaatori syzbot<\/a><\/noindex> KASAN (Kernel Address Sanitizer), mis on suunatud m\u00e4lu vigade ja vale m\u00e4lu k\u00e4sitlemise, n\u00e4iteks juba vabastatud m\u00e4lu aladele juurdep\u00e4\u00e4su ning koodi paigutamisele m\u00f5eldud m\u00e4lualadele, tuvastamisele.<\/a><\/noindex> Linuxi tuumas tuvastati haavatavus ( <\/p>\n

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

Allikas: 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\udd47Linuxi tuuma haavatavus, mis v\u00f5imaldab kokku kukkuda UDP-paketi saatmise kaudu | ProHoster","description":"\ud83e\udd47 Linuxi tuuma haavatavus, mis v\u00f5imaldab kokku kukkumist UDP-paketi saatmise kaudu | 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