{"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 leitud haavatavus, mis v\u00f5imaldab \u00f5igusi t\u00f5sta l\u00e4bi BPF","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Avaldatud<\/a><\/noindex> haavatavuse andmed (CVE-2020-8835<\/a><\/noindex>) Linuxi s\u00fcdamikus, mida kasutati v\u00f5istlusel Pwn2Own 2020<\/a><\/noindex> Ubuntu h\u00e4kkimise demonstreerimiseks. Haavatavus v\u00f5imaldas privileegideta kasutajal saada root-\u00f5igused. T\u00f6\u00f6korras exploiti on olemas, kuid see ei ole veel avaldatud. Haavatavus on olemas eBPF alamprogrammis, mis v\u00f5imaldab k\u00e4ivitada t\u00f6\u00f6tlejaid j\u00e4lgimiseks, s\u00fcsteemide t\u00f6\u00f6 anal\u00fc\u00fcsimiseks ja liikluse haldamiseks, mis k\u00e4ivituvad s\u00fcdamikus spetsiaalses virtuaalses masinas JIT-i abil.<\/p>\n

Probleem tuleneb veast funktsioonis __reg_bound_offset32(), mis kontrollib 32-bitiseid toiminguid BPF baits koodis. Vale registri piiri arvutamine tekitas tingimusi andmete kirjutamiseks ja lugemiseks v\u00e4ljaspool reserveeritud vahem\u00e4lu s\u00fcdamiku m\u00e4lus, kui t\u00f6\u00f6deldi spetsiaalselt kujundatud BPF rakendusi. Probleem tekkis s\u00fcdamikus 5.5 ja hiljem, kui parandusi tagasiviidi, viidi see s\u00fcdamikku 5.4 ning samuti pakettidez s\u00fcdamikuga 5.3<\/a><\/noindex>, mille pakub Ubuntu Linux.<\/p>\n

Haavatavuse blokeerimiseks soovitatakse tagasi p\u00f6\u00f6rata<\/a><\/noindex> probleemne patch v\u00f5i keelata BPF rakenduste k\u00e4itamine privileegideta kasutajate poolt, seadistades sysctl kernel.unprivileged_bpf_disabled v\u00e4\u00e4rtuseks 1. Paranduste staatus jaotistes: Ubuntu<\/a><\/noindex>, Debian<\/a><\/noindex>, Arch<\/a><\/noindex>, Fedora<\/a><\/noindex> ja SUSE<\/a><\/noindex> (s\u00fcdamikud RHEL<\/a><\/noindex> probleemne muudatus ei ole edasi kantud).<\/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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