{"id":76196,"date":"2020-03-31T19:42:05","date_gmt":"2020-03-31T17:42:05","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf"},"modified":"2020-03-31T19:42:05","modified_gmt":"2020-03-31T17:42:05","slug":"uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/uyazvimost-v-yadre-linux-pozvolyayushhaya-povysit-svoi-privilegii-cherez-bpf","title":{"rendered":"Linuxi tuumas esinev haavatavus, mis v\u00f5imaldab privileegide suurenemist BPF kaudu.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avaldatud<\/a><\/noindex> teave haavatavuse kohta (CVE-2020-8835<\/a><\/noindex>) Linuxi kerneli, seda kasutati Ubuntu h\u00e4kkimise n\u00e4itamisel. Haavatavus v\u00f5imaldas mitteprivileegitud kasutajal saada root-\u00f5igused. Tegutsev eksploiteerimine eksisteerib, kuid pole veel avaldatud. Haavatavus esines eBPF alamk\u00e4ituses, mis v\u00f5imaldab k\u00e4itada t\u00f6\u00f6tlusi j\u00e4lgimiseks, s\u00fcsteemi j\u00f5udluse anal\u00fc\u00fcsimiseks ja liikluse juhtimiseks, tehes seda kerneli sees spetsiaalses virtuaalmasinas JIT-is. Pwn2Own 2020<\/a><\/noindex> Ubuntu'i kahjustuse demonstreerimise k\u00e4igus. Haavatavus v\u00f5imaldas madala privileegiga kasutajal saada root \u00f5igused. T\u00f6\u00f6v\u00f5ime olevat olemas, kuid see pole veel avaldatud. Haavatavus esineb eBPF alamteemas, mis v\u00f5imaldab k\u00e4ivitada funktsioone j\u00e4lgimiseks, alams\u00fcsteemide anal\u00fc\u00fcsiks ja liikluse haldamiseks, teostades neid kernelis spetsiaalses JIT virtualiseerimismasinas.<\/p>\n

Probleem on tingitud veast funktsioonis __reg_bound_offset32(), mida kasutatakse 32-bitiste operatsioonide kontrollimiseks BPF bytecode'is. Vale registri piiri arvutamise t\u00f5ttu, tekkisid tingimused spetsiaalselt formaadis BPF-rakenduste t\u00f6\u00f6tlemisel, mis v\u00f5imaldasid andmete lugemist ja kirjutamist m\u00e4luruumi v\u00e4ljaspool eraldatud pufferit. Probleem tekkis kernelis 5.5 ja hiljem, kui parandusi tagurpidi t\u00f5mmati, viidi see kernelisse 5.4, samuti pakett kerneliga 5.3<\/a><\/noindex>, mida pakutakse Ubuntu Linuxis.<\/p>\n

Haavatavuse blokeerimiseks soovitatakse tagasi t\u00f5mmata<\/a><\/noindex> probleemne patch v\u00f5i peatada BPF-rakenduste k\u00e4itamine mitteprivilegeeritud kasutajate poolt, seadistades sysctl kernel.unprivileged_bpf_disabled v\u00e4\u00e4rtuseks 1. Paranduse staatus distributsioonides: Ubuntu<\/a><\/noindex>, Debian<\/a><\/noindex>, Arch<\/a><\/noindex>, Fedora<\/a><\/noindex> ja SUSE<\/a><\/noindex> (tuumades RHEL<\/a><\/noindex> probleemset muudatust ei viidud \u00fcle).<\/p>\n

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

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

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