{"id":119988,"date":"2024-09-30T09:21:07","date_gmt":"2024-09-30T07:21:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-libnv-vo-freebsd-i-uyazvimosti-v-netfilter-v-linux"},"modified":"2024-09-30T09:21:07","modified_gmt":"2024-09-30T07:21:07","slug":"uyazvimost-v-libnv-vo-freebsd-i-uyazvimosti-v-netfilter-v-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-libnv-vo-freebsd-i-uyazvimosti-v-netfilter-v-linux","title":{"rendered":"Ranljivost u libnv u FreeBSD-u i ranjivosti u Netfilteru u Linuxu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

U ispravci objavljenoj po\u010detkom rujna otkrivena je logi\u010dka gre\u0161ka u biblioteci libnv, zbog koje ranjivost nije ispravno eliminirana i sustav je ostao izlo\u017een napadima. Biblioteku libnv razvija projekt FreeBSD i koristi se u jezgru i aplikacijama osnovnog sustava za obradu popisa u formatu klju\u010d\/vrijednost i za organizaciju prijenosa podataka tijekom me\u0111uprocesne komunikacije. Biblioteka se temelji na algoritmu nvlist, koji se koristi u projektu OpenZFS, ali je u FreeBSD stvorena vlastita implementacija pa ranjivost ne utje\u010de na OpenZFS. <\/p>\n

Ranjivost je uzrokovana prekomjernim prelivanjem cijelog broja, \u0161to dovodi do dodjeljivanja me\u0111uspremnika koji je manji od blok podataka koji se zapisuje u me\u0111uspremnik. Dozvoljena gre\u0161ka mo\u017ee se potencijalno iskoristiti za pove\u0107anje privilegija prepisivanjem podru\u010dja memorije u jezgru i sustavskim procesima, primjerice, libnv se koristi u libcasperu tijekom interakcije izme\u0111u privilegiranog i neprivilegiranog koda. Ispravna korekcija ranjivosti (CVE-2024-45287) predlo\u017eena je u a\u017euriranjima 14.1-RELEASE-p5, 14.0-RELEASE-p11, 13.4-RELEASE-p1 i 13.3-RELEASE-p7, kao i u obliku ispravke. <\/p>\n

U FreeBSD-u je tako\u0111er ispravljena ranjivost (CVE-2024-41721) u hipervizoru bhyve, koja potencijalno omogu\u0107uje izvr\u0161avanje koda u procesu koji se izvodi na strani host-sustava (obi\u010dno s pravima root, ali izoliran u sandboxu temeljenom na Capsicum), tijekom manipulacija unutar gostuju\u0107eg sustava. Ranjivost je prisutna u kodu za emulaciju USB kontrolera XHCI i uzrokovana je nedovoljnim provjerama granica me\u0111uspremnika, \u0161to mo\u017ee dovesti do \u010ditanja podataka iz podru\u010dja izvan me\u0111uspremnika, kao i potencijalno omogu\u0107iti pisanje u proizvoljno podru\u010dje memorije procesa. Napad se mo\u017ee izvr\u0161iti uz mogu\u0107nost pokretanja privilegiranih procesa u gostuju\u0107em sustavu. Ranjivost je ispravljena u a\u017euriranjima FreeBSD 14.1-RELEASE-p5, 14.0-RELEASE-p11, 13.4-RELEASE-p1 i 13.3-RELEASE-p7. <\/p>\n

Osim toga, mo\u017ee se primijetiti objavljivanje radnih prototipova eksploita i opisa metoda iskori\u0161tavanja za ranije otkrivene ranjivosti u Linux jezgri CVE-2024-26808 i CVE-2024-1085. Problemi su ispravljeni u nadogradnjama jezgre 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3 i 6.8, te su ve\u0107 ispravljeni u glavnim distribucijama (Debian, Ubuntu, RHEL, SUSE, Fedora). Ranjivosti su uzrokovane pristupu ve\u0107 oslobo\u0111enom podru\u010dju memorije u funkcijama nft_chain_filter i nft_setelem_catchall_deactivate u netfilter pod sustavu, i omogu\u0107uju izvr\u0161avanje koda s root pravima. Za izvo\u0111enje napada potrebno je imati pristup nftables, koji se mo\u017ee dobiti s CAP_NET_ADMIN pravima u bilo kojem prostoru imenskih identifikatora korisnika (user namespace) ili mre\u017enom prostoru imenskih identifikatora (network namespace), koji su dostupni, na primjer, u izoliranim kontejnerima. <\/p>\n

Eksploiti su pripremljeni od strane sudionika inicijative KernelCTF (Kernel Capture the Flag), u okviru koje tvrtka Google ispla\u0107uje nagrade za otkrivanje ranjivosti u Linux jezgru. Isprva su se problemi smatrali samo jednim od mnogih prolaznih potencijalnih ranjivosti u jezgru \u2014 na primjer, u lipanjskom a\u017euriranju paketa jezgra 5.10 u Debijanu, pored CVE-2024-26808, ispravljeno je jo\u0161 345 (!) potencijalnih ranjivosti. Svakog tjedna u jezgru se otkrije nekoliko desetaka novih ranjivosti koje prethodno nisu bile identificirane kao sigurnosni problemi (na primjer, pro\u0161li tjedan ozna\u010deno je 68 ranjivosti).
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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logi\u010dka gre\u0161ka zbog koje ranjivost nije ispravljena na pravi na\u010din i sustav je ostao izlo\u017een napadu.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-libnv-vo-freebsd-i-uyazvimosti-v-netfilter-v-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \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 libnv \u0432\u043e FreeBSD \u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 Netfilter \u0432 Linux | ProHoster","og:description":"\u0412 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