{"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\/sk\/blog\/news\/uyazvimost-v-libnv-vo-freebsd-i-uyazvimosti-v-netfilter-v-linux","title":{"rendered":"Zranite\u013enos\u0165 v libnv vo FreeBSD a zranite\u013enosti v Netfilter v Linuxe.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V vydan\u00ed opravy zranite\u013enosti v kni\u017enici libnv na za\u010diatku septembra bola zisten\u00e1 logick\u00e1 chyba, kv\u00f4li ktorej nebolo mo\u017en\u00e9 zranite\u013enos\u0165 adekv\u00e1tne odstr\u00e1ni\u0165 a syst\u00e9m zostal n\u00e1chyln\u00fd na \u00fatok. Kni\u017enica libnv sa vyv\u00edja v projekte FreeBSD a pou\u017e\u00edva sa v jadre a v aplik\u00e1ci\u00e1ch z\u00e1kladn\u00e9ho syst\u00e9mu na spracovanie zoznamov vo form\u00e1te k\u013e\u00fa\u010d\/hodnota a na organizovanie prenosu \u00fadajov medzi procesmi. Kni\u017enica je zalo\u017een\u00e1 na algoritme nvlist, ktor\u00fd sa pou\u017e\u00edva v projekte OpenZFS, no vo FreeBSD bola vytvoren\u00e1 vlastn\u00e1 implement\u00e1cia, a preto sa zranite\u013enos\u0165 net\u00fdka OpenZFS. <\/p>\n

Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 prete\u010den\u00edm cel\u00e9ho \u010d\u00edsla, \u010do vedie k alok\u00e1cii vyrovn\u00e1vacej pam\u00e4te men\u0161ej, ako je blok \u00fadajov zapisovan\u00fd do vyrovn\u00e1vacej pam\u00e4te. Podcenen\u00e1 chyba m\u00f4\u017ee potenci\u00e1lne sl\u00fa\u017ei\u0165 na zv\u00fd\u0161enie privil\u00e9gi\u00ed tak, \u017ee prep\u00ed\u0161e oblasti pam\u00e4te v jadre a syst\u00e9mov\u00fdch procesoch, napr\u00edklad libnv sa pou\u017e\u00edva v libcasper p\u0159i interakcii medzi privilegovan\u00fdm a nepriviligovan\u00fdm k\u00f3dom. Spr\u00e1vne opravenie zranite\u013enosti (CVE-2024-45287) bolo navrhnut\u00e9 v aktualiz\u00e1ci\u00e1ch 14.1-RELEASE-p5, 14.0-RELEASE-p11, 13.4-RELEASE-p1 a 13.3-RELEASE-p7, ako aj vo forme patchu. <\/p>\n

Vo FreeBSD bola tie\u017e odstr\u00e1nen\u00e1 zranite\u013enos\u0165 (CVE-2024-41721) v hyperv\u00edzore bhyve, ktor\u00e1 potenci\u00e1lne umo\u017e\u0148uje vykonanie k\u00f3du v procese, ktor\u00fd be\u017e\u00ed na strane hostite\u013eskej s\u00fastavy (zvy\u010dajne s pr\u00e1vami root, ale izolovan\u00fd sandboxom na b\u00e1ze Capsicum) pri manipul\u00e1ci\u00e1ch vo vn\u00fatri hos\u0165ovacej s\u00fastavy. Zranite\u013enos\u0165 je pr\u00edtomn\u00e1 v k\u00f3de na emul\u00e1ciu USB ovl\u00e1da\u010da XHCI a je sp\u00f4soben\u00e1 nedostato\u010dnou kontrolou hran\u00edc vyrovn\u00e1vacej pam\u00e4te, \u010do m\u00f4\u017ee vies\u0165 k \u010d\u00edtaniu \u00fadajov z oblasti mimo vyrovn\u00e1vacej pam\u00e4te, ako aj potenci\u00e1lne k mo\u017enosti z\u00e1pisu do \u013eubovo\u013enej oblasti pam\u00e4te procesu. \u00datok m\u00f4\u017ee by\u0165 vykonan\u00fd pri mo\u017enosti spustenia privilegovan\u00fdch procesov v hos\u0165ovacej s\u00fastave. Zranite\u013enos\u0165 bola odstr\u00e1nen\u00e1 v aktualiz\u00e1ci\u00e1ch FreeBSD 14.1-RELEASE-p5, 14.0-RELEASE-p11, 13.4-RELEASE-p1 a 13.3-RELEASE-p7. <\/p>\n

Okrem toho je mo\u017en\u00e9 zaznamena\u0165 zverejnenie pracovn\u00fdch prototypov exploitov a opisov met\u00f3d vyu\u017eitia pre predt\u00fdm zisten\u00e9 zranite\u013enosti v jadre Linux CVE-2024-26808 a CVE-2024-1085. Probl\u00e9my boli vyrie\u0161en\u00e9 v aktualiz\u00e1ci\u00e1ch jadra 5.10.210, 5.15.149, 6.1.76, 6.6.15, 6.7.3 a 6.8, a u\u017e boli opraven\u00e9 v hlavn\u00fdch distrib\u00faci\u00e1ch (Debian, Ubuntu, RHEL, SUSE, Fedora). Zranite\u013enosti s\u00fa sp\u00f4soben\u00e9 pr\u00edstupom k u\u017e uvo\u013enenej oblasti pam\u00e4te vo funkci\u00e1ch nft_chain_filter a nft_setelem_catchall_deactivate v subsyst\u00e9me netfilter a umo\u017e\u0148uj\u00fa vykonanie k\u00f3du s opr\u00e1vneniami root. Na vykonanie \u00fatoku je potrebn\u00fd pr\u00edstup k nftables, ktor\u00fd je mo\u017en\u00e9 z\u00edska\u0165 pri existuj\u00facich pr\u00e1vach CAP_NET_ADMIN v akomko\u013evek mennom priestore identifik\u00e1torov pou\u017e\u00edvate\u013eov (user namespace) alebo sie\u0165ovom mennom priestore (network namespace), ktor\u00e9 s\u00fa poskytovan\u00e9 napr\u00edklad v izolovan\u00fdch kontajneroch. <\/p>\n

Exploity pripravili \u010dlenovia iniciat\u00edvy KernelCTF (Kernel Capture the Flag), v r\u00e1mci ktorej spolo\u010dnos\u0165 Google vypl\u00e1ca odmeny za odha\u013eovanie zranite\u013enost\u00ed v jadre Linux. P\u00f4vodne sa probl\u00e9my pova\u017eovali za jedny z mnoh\u00fdch okrajov\u00fdch potenci\u00e1lnych zranite\u013enost\u00ed v jadre \u2014 napr\u00edklad v j\u00fanovej aktualiz\u00e1cii bal\u00edka s jadrom 5.10 v Debiane bolo okrem CVE-2024-26808 opraven\u00fdch \u010fal\u0161\u00edch 345 (!) potenci\u00e1lnych zranite\u013enost\u00ed. Ka\u017ed\u00fd t\u00fd\u017ede\u0148 sa v jadre objav\u00ed nieko\u013eko desiatok nov\u00fdch zranite\u013enost\u00ed, ktor\u00e9 predt\u00fdm neboli identifikovan\u00e9 ako bezpe\u010dnostn\u00e9 probl\u00e9my (napr\u00edklad minul\u00fd t\u00fd\u017ede\u0148 bolo ozna\u010den\u00fdch 68 zranite\u013enost\u00ed).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0432\u044b\u043f\u0443\u0449\u0435\u043d\u043d\u043e\u043c \u0432 \u043d\u0430\u0447\u0430\u043b\u0435 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libnv \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043e\u0448\u0438\u0431\u043a\u0430, \u0438\u0437-\u0437\u0430 \u043a\u043e\u0442\u043e\u0440\u043e\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043d\u0435 \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u043b\u0430\u0441\u044c \u0434\u043e\u043b\u0436\u043d\u044b\u043c \u043e\u0431\u0440\u0430\u0437\u043e\u043c \u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043e\u0441\u0442\u0430\u0432\u0430\u043b\u0430\u0441\u044c \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u0430 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zisten\u00e1 logick\u00e1 chyba, kv\u00f4li ktorej sa zranite\u013enos\u0165 dostato\u010dne nevyrie\u0161ila a syst\u00e9m zostal zranite\u013en\u00fd vo\u010di \u00fatoku.","canonical_url":"https:\/\/prohoster.info\/sk\/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":"sk_SK","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 | 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