{"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\/et\/blog\/news\/uyazvimost-v-realizaczii-soketov-af_packet-yadra-linux","title":{"rendered":"AF_PACKET soklite rakenduse haavatavus Linuxi s\u00fcdamikus","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Kolm aastat p\u00e4rast haavatavuste laine (1<\/a><\/noindex>, 2<\/a><\/noindex>, 3<\/a><\/noindex>, 4<\/a><\/noindex>, 5<\/a><\/noindex>) Linuxi tuuma AF_PACKET alamkomponendis tuvastatud<\/a><\/noindex> veel \u00fcks probleem (CVE-2020-14386<\/a><\/noindex>), mis v\u00f5imaldab kohalikel privileegideta kasutajatel k\u00e4itada koodi root-\u00f5igustes v\u00f5i v\u00e4lja p\u00e4\u00e4seda isoleeritud konteineritest, kui nendes on root-juurdep\u00e4\u00e4s.<\/p>\n

AF_PACKET sokli loomiseks ja haavatavuse \u00e4ra kasutamiseks on vaja CAP_NET_RAW \u00f5igusi. Siiski v\u00f5ib see \u00f5iguse hankida privileegideta kasutaja konteinerites, mis on loodud kasutajate nime ruumide (user namespaces) toetusega s\u00fcsteemides. N\u00e4iteks on Ubuntu ja Fedora vaikimisi sisse l\u00fclitatud kasutajate nime ruumid, kuid neid ei ole aktiveeritud Debianis ja RHEL-is. Androidis on AF_PACKET soklite loomise \u00f5igus protsessil mediaserver, mille kaudu v\u00f5ib haavatavuse \u00e4ra kasutada.<\/p>\n

Haavatavus esineb tpacket_rcv funktsioonis ja on p\u00f5hjustatud netoff muutujate arvutamise veast. R\u00fcnnakija suudab luua tingimused, kus netoff muutujasse kirjutatakse v\u00e4\u00e4rtus, mis on v\u00e4iksem kui maclen muutuja, mis p\u00f5hjustab \u00fcleujutuse macoff = netoff - maclen arvutamisel ja vale j\u00e4rgneva pointeri seadistamise vastuv\u00f5etava andmebufferi jaoks. Selle tulemusena v\u00f5ivad r\u00fcndajad algatada andmete kirjutamise vahemikus 1 kuni 10 baiti eraldatud bufferi piiridest v\u00e4lja. T\u00e4heldatakse, et on arendamisel eksploit, mis v\u00f5imaldab s\u00fcsteemis saada root \u00f5igusi. <\/p>\n

Probleem on olemas olnud juulist 2008, st see avaldub k\u00f5igis aktuaalsetes tuumades. Parandus on seni saadaval kujul patch<\/a><\/noindex>. Pakettide uuenduste j\u00e4lgimist jaotustes saab teha j\u00e4rgmistel lehtedel: Ubuntu<\/a><\/noindex>, Fedora<\/a><\/noindex>, SUSE<\/a><\/noindex>, Debian<\/a><\/noindex>, RHEL<\/a><\/noindex>, Arch<\/a><\/noindex>.<\/p>\n

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

Allikas: 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, 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\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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