{"id":113232,"date":"2024-01-29T18:50:31","date_gmt":"2024-01-29T16:50:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-01-29T18:50:31","modified_gmt":"2024-01-29T16:50:31","slug":"uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Luka w stosie IPv6 j\u0105dra Linux, umo\u017cliwiaj\u0105ca zdalne wykonywanie kodu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Odkryto informacje o podatno\u015bci CVE-2023-6200 w stosie sieciowym j\u0105dra Linux, kt\u00f3ra w okre\u015blonych okoliczno\u015bciach pozwala atakuj\u0105cemu z lokalnej sieci na wykonanie swojego kodu poprzez wys\u0142anie specjalnie sformatowanego pakietu ICMPv6 z wiadomo\u015bci\u0105 RA (Router Advertisement), przeznaczon\u0105 do og\u0142aszania informacji o routerze. <\/p>\n

Vulnerability can only be exploited from the local network and manifests in systems with IPv6 support enabled and the active sysctl parameter «net.ipv6.conf.<network_interface_name>.accept_ra» (which can be checked with the command «sysctl net.ipv6.conf | grep accept_ra»), which by default is disabled in RHEL and Ubuntu for external network interfaces, but enabled for the loopback interface, allowing an attack from the same system. <\/p>\n

Podatno\u015b\u0107 spowodowana jest stanem wy\u015bcigu podczas przetwarzania przez zbieracz \u015bmieci przestarza\u0142ych zapis\u00f3w fib6_info, co mo\u017ce prowadzi\u0107 do odwo\u0142ania si\u0119 do ju\u017c zwolnionego obszaru pami\u0119ci (use-after-free). Po otrzymaniu pakietu ICMPv6 z wiadomo\u015bci\u0105 o og\u0142oszeniu routera (RA, Router Advertisement) stos sieciowy wywo\u0142uje funkcj\u0119 ndisc_router_discovery(), kt\u00f3ra w przypadku, gdy w wiadomo\u015bci RA znajduj\u0105 si\u0119 dane o czasie \u017cycia trasy, wywo\u0142uje funkcj\u0119 fib6_set_expires() i wype\u0142nia struktur\u0119 gc_link. Do oczyszczania przestarza\u0142ych zapis\u00f3w stosuje si\u0119 funkcj\u0119 fib6_clean_expires(), kt\u00f3ra od\u0142\u0105cza rekord w gc_link i czy\u015bci pami\u0119\u0107 wykorzystywan\u0105 przez struktur\u0119 fib6_info. W tym momencie pami\u0119\u0107 dla struktury fib6_info zosta\u0142a ju\u017c zwolniona, ale odniesienie do niej nadal znajduje si\u0119 w strukturze gc_link. <\/p>\n

The vulnerability is present starting from branch 6.6 and is fixed in versions 6.6.9 and 6.7. The status of vulnerability resolution in distributions can be evaluated on the following pages: Debian, Ubuntu, SUSE, RHEL, Fedora, Arch Linux, Gentoo, Slackware. Among the distributions that supply packages with kernel 6.6, we can note Arch Linux, Gentoo, Fedora, Slackware, OpenMandriva, and Manjaro; in other distributions, backporting of the change with the error in the packages with older kernel branches is not excluded (for example, Debian mentions that the vulnerable package is with kernel 6.5.13, while the problematic change appeared in branch 6.6). As a workaround for protection, IPv6 can be disabled or the parameters «net.ipv6.conf.*.accept_ra» can be set to 0.
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\u0179r\u00f3d\u0142o: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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w okre\u015blonych okoliczno\u015bciach umo\u017cliwia to napastnikowi z lokalnej sieci wykonanie swojego kodu poprzez wysy\u0142anie wiadomo\u015bci.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","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 IPv6-\u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u0434\u043e\u043f\u0443\u0441\u043a\u0430\u044e\u0449\u0430\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043a\u043e\u0434\u0430 | ProHoster","og:description":"\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0430 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 CVE-2023-6200) \u0432 \u0441\u0435\u0442\u0435\u0432\u043e\u043c \u0441\u0442\u0435\u043a\u0435 \u044f\u0434\u0440\u0430 Linux, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043f\u0440\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u043e\u0431\u0441\u0442\u043e\u044f\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430\u0445 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a\u0443 \u0438\u0437 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0441\u0432\u043e\u0435\u0433\u043e \u043a\u043e\u0434\u0430 \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443.","og:url":"https:\/\/prohoster.info\/pl\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2024-01-29T16:50:31+00:00","article:modified_time":"2024-01-29T16:50:31+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":[],"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/113232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/comments?post=113232"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/posts\/113232\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/media?parent=113232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/categories?post=113232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/pl\/wp-json\/wp\/v2\/tags?post=113232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}