{"id":103645,"date":"2022-03-29T15:37:18","date_gmt":"2022-03-29T13:37:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec"},"modified":"2022-03-29T15:37:18","modified_gmt":"2022-03-29T13:37:19","slug":"v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","title":{"rendered":"V jedru Linux so bile odkrite izkori\u0161\u010dene ranljivosti v nf_tables, watch_queue in IPsec","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V jedru Linux je bilo odkrito ve\u010d nevarnih ranljivosti, ki omogo\u010dajo lokalnemu uporabniku zvi\u0161anje svojih privilegijev v sistemu. Za vse obravnavane te\u017eave so pripravljeni delujo\u010di prototipi izkori\u0161\u010danj.    <\/p>\n<ul>\n<li class=\"l\"> \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c  (CVE-2022-0995) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439 watch_queue, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043b\u044e\u0431\u044b\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 \u044f\u0434\u0440\u0430. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 watch_queue_set_size()  \u0438 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043f\u043e\u043f\u044b\u0442\u043a\u043e\u0439  \u043e\u0447\u0438\u0441\u0442\u043a\u0438 \u0432\u0441\u0435\u0445 \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u0435\u0439 \u0432 \u0441\u043f\u0438\u0441\u043a\u0435, \u0434\u0430\u0436\u0435 \u0435\u0441\u043b\u0438 \u0434\u043b\u044f \u043d\u0438\u0445 \u043d\u0435 \u0431\u044b\u043b\u0430 \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u0430 \u043f\u0430\u043c\u044f\u0442\u044c. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u044f\u0434\u0440\u0430 \u0441 \u043e\u043f\u0446\u0438\u0435\u0439 &#171;CONFIG_WATCH_QUEUE=y&#187;, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u0434\u0438\u0441\u0442\u0440\u0438\u0431\u0443\u0442\u0438\u0432\u043e\u0432 Linux.\n<p>Ranljivost je bila odpravljena z izbolj\u0161avo, dodano v jedro 11. marca. Sproti lahko spremljate objave posodobitev paketov v distribucijah na teh straneh: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Prototip izkori\u0161\u010danja je \u017ee javno dostopen in omogo\u010da pridobitev root dostopa pri zagonu v Ubuntu 21.10 z jedrom 5.13.0-37.      <center><img decoding=\"async\" alt=\"V jedru Linux so bile odkrite izkori\u0161\u010dene ranljivosti v nf_tables, watch_queue in IPsec\" src=\"\/wp-content\/uploads\/2022\/03\/9cdfd5bdf66d257757d1a4c600b96249.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<li class=\"l\"> Ranljivost (CVE-2022-27666) v modulih jedra esp4 in esp6, ki izvajajo ESP pretvorbe (Encapsulating Security Payload) za IPsec, uporabljene pri uporabi IPv4 in IPv6. Ranljivost omogo\u010da lokalnemu uporabniku z obi\u010dajnimi privilegiji prepisovanje objektov v pomnilniku jedra in zvi\u0161anje svojih privilegijev v sistemu. Te\u017eava je posledica pomanjkanja preverjanja dodeljene velikosti pomnilnika in dejansko prejetih podatkov, pri \u010demer je lahko najve\u010dja velikost sporo\u010dila presegla najve\u010djo velikost pomnilnika, dodeljenega za strukturo skb_page_frag_refill.\n<p>Ranljivost je bila odpravljena v jedru 7. marca (popravljena v verzijah 5.17, 5.16.15 itd.). Posodobitve paketov v distribucijah lahko spremljate na naslednjih straneh: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Delujo\u010di prototip eksploita, ki omogo\u010da navadnemu uporabniku dostop do root uporabnika na Ubuntu Desktop 21.10 s privzetimi nastavitvami, je \u017ee objavljen na GitHubu. Trdi se, da bo eksploit deloval tudi v Fedora in Debian z manj\u0161imi spremembami. Zanimivo je, da je bil eksploit prvotno pripravljen za tekmovanje pwn2own 2022, a so razvijalci jedra odkrili in odpravili povezano napako, zato so se odlo\u010dili razkriti podrobnosti ranljivosti.      <center>  <video controls=\"\" style=\"width: 720px; height: 480px; max-width:100%\" src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" ><source src=\"https:\/\/etenal.me\/wp-content\/uploads\/2022\/03\/yes_root.mp4\" type=\"video\/mp4\"><\/video><\/center>    <\/p>\n<li class=\"l\"> Dve ranljivosti (CVE-2022-1015, CVE-2022-1016) v podalj\u0161ku netfilter v modulu nf_tables, ki zagotavlja delovanje filtrov paketov nftables. Prva te\u017eava omogo\u010da lokalnemu nepriviligiranemu uporabniku, da dose\u017ee zapis zunaj dodeljenega pomnilni\u0161kega prostora na steklu. Prelivanje se pojavi pri obdelavi dolo\u010denih oblikovanih izrazov nftables, ki se obdelujejo med fazo preverjanja indeksov, ki jih dolo\u010di uporabnik, ki ima dostop do pravil nftables.\n<p>\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u043e\u0434\u0440\u0430\u0437\u0443\u043c\u0435\u0432\u0430\u043b\u0438, \u0447\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 &#171;enum nft_registers reg&#187; \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0434\u043d\u0438\u043c \u0431\u0430\u0439\u0442\u043e\u043c, \u0432 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043a\u0430\u043a \u043f\u0440\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0432 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0438\u0438 \u0441\u043e \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0435\u0439 C89 \u043c\u043e\u0436\u0435\u0442 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u043d\u0435\u0433\u043e 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435. \u0418\u0437-\u0437\u0430 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0439 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0439 \u043f\u0440\u0438 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0435 \u0438 \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u0438\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u0440\u0430\u0437\u043c\u0435\u0440 \u043d\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0444\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u043e\u043c\u0443 \u0440\u0430\u0437\u043c\u0435\u0440\u0443 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0435, \u0447\u0442\u043e \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0430\u043b\u043e\u0436\u0435\u043d\u0438\u044e \u0445\u0432\u043e\u0441\u0442\u0430 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b \u043d\u0430 \u0443\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u0438 \u0432 \u0441\u0442\u0435\u043a\u0435.    <\/p>\n<p>\u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0434\u043b\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430, \u043d\u043e \u0434\u043b\u044f \u0443\u0441\u043f\u0435\u0448\u043d\u043e\u0439 \u0430\u0442\u0430\u043a\u0438 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a nftables, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u043c \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u0438\u043c\u0451\u043d (network namespaces) \u043f\u0440\u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0438 \u043f\u0440\u0430\u0432 CLONE_NEWUSER \u0438\u043b\u0438 CLONE_NEWNET (\u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0437\u0430\u043f\u0443\u0441\u043a\u0430 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0435\u0439\u043d\u0435\u0440\u0430). \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0442\u0430\u043a\u0436\u0435 \u0442\u0435\u0441\u043d\u043e \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u043c\u0438 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u043c \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0432\u043a\u043b\u044e\u0447\u0430\u044e\u0442\u0441\u044f \u043f\u0440\u0438 \u0441\u0431\u043e\u0440\u043a\u0435 \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &#171;CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y&#187;. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u0430 \u043d\u0430\u0447\u0438\u043d\u0430\u044f \u0441 \u044f\u0434\u0440\u0430 Linux 5.12.    <\/p>\n<p>Druga ranljivost v netfilterju je posledica dostopa do \u017ee osvobojene spominske povr\u0161ine (use-after-free) v obdelovalniku nft_do_chain in lahko privede do pu\u0161\u010danja neinicijaliziranih obmo\u010dij jedra, ki jih je mogo\u010de brati z manipulacijo z izrazi nftables in uporabiti, na primer, za dolo\u010ditev naslovov kazalnikov pri razvoju eksploitov za druge ranljivosti. Izkori\u0161\u010danje ranljivosti je mogo\u010de od jedra Linux 5.13.    <\/p>\n<p>Ranljivosti so odpravljene v dana\u0161njih popravnih posodobitvah jedra 5.17.1, 5.16.18, 5.15.32, 5.10.109, 5.4.188, 4.19.237, 4.14.274 in 4.9.309. Sledenje objavam posodobitvenih paketov v distribucijah je mogo\u010de na naslednjih straneh: Debian, SUSE, Ubuntu, RHEL, Fedora, Gentoo, Arch Linux. Raziskovalec, ki je odkril te\u017eave, je izjavil, da pripravlja delujo\u010de eksploitne kode za obe ranljivosti, ki jih namerava objaviti \u010dez nekaj dni, po tem ko distribucije izdate popravke paketov z jedrom.      <\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56931\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043e \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043e\u043f\u0430\u0441\u043d\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0445 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u0414\u043b\u044f \u0432\u0441\u0435\u0445 \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u044b \u0440\u0430\u0431\u043e\u0447\u0438\u0435 \u043f\u0440\u043e\u0442\u043e\u0442\u0438\u043f\u044b \u044d\u043a\u0441\u043f\u043b\u043e\u0438\u0442\u043e\u0432. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2022-0995) \u0432 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u0441\u043e\u0431\u044b\u0442\u0438\u0439 watch_queue, \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u043e\u043c \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0431\u0443\u0444\u0435\u0440\u0430. \u0410\u0442\u0430\u043a\u0430 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0430 \u043b\u044e\u0431\u044b\u043c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u043c \u0438 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0437\u0430\u043f\u0443\u0441\u043a\u0443 \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103646,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103645","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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Za vse obravnavane te\u017eave so pripravljeni delujo\u010di prototipi izkori\u0161\u010danj.","canonical_url":"https:\/\/prohoster.info\/sl\/blog\/news\/v-yadre-linux-vyyavleny-ekspluatiruemye-uyazvimosti-v-nf_tables-watch_queue-i-ipsec","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"sl_SI","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\u0412 \u044f\u0434\u0440\u0435 Linux \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u043c\u044b\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 nf_tables, 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