{"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\/hu\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Vulnerability in the Linux kernel's IPv6 stack allows remote code execution","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Felfedt\u00e9k a CVE-2023-6200 s\u00e9r\u00fcl\u00e9kenys\u00e9g inform\u00e1ci\u00f3it a Linux kernel h\u00e1l\u00f3zati stackj\u00e9ben, amely bizonyos k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt lehet\u0151v\u00e9 teszi, hogy a helyi h\u00e1l\u00f3zaton l\u00e9v\u0151 t\u00e1mad\u00f3 k\u00f3dot futtasson egy speci\u00e1lisan form\u00e1zott ICMPv6 csomag RA (Router Advertisement) \u00fczenet\u00e9nek elk\u00fcld\u00e9s\u00e9vel, amely a router inform\u00e1ci\u00f3k hirdet\u00e9s\u00e9re szolg\u00e1l. <\/p>\n

A sebezhet\u0151s\u00e9g csak a helyi h\u00e1l\u00f3zatb\u00f3l kihaszn\u00e1lhat\u00f3, \u00e9s az IPv6 t\u00e1mogat\u00e1ssal rendelkez\u0151 rendszerekben nyilv\u00e1nul meg, ahol az activ sysctl param\u00e9ter be van kapcsolva «net.ipv6.conf.<h\u00e1l\u00f3zati_interf\u00e9sz_n\u00e9v>.accept_ra» (ellen\u0151rizhet\u0151 a «sysctl net.ipv6.conf| grep accept_ra» parancs seg\u00edts\u00e9g\u00e9vel), amely alap\u00e9rtelmez\u00e9s szerint ki van kapcsolva RHEL \u00e9s Ubuntu eset\u00e9ben a k\u00fcls\u0151 h\u00e1l\u00f3zati interf\u00e9szeken, de be van kapcsolva a loopback interf\u00e9szen, ami lehet\u0151v\u00e9 teszi a t\u00e1mad\u00e1st ugyanarr\u00f3l a rendszerr\u0151l. <\/p>\n

A s\u00e9r\u00fcl\u00e9kenys\u00e9get versenyhelyzet okozza a fib6_info elavult bejegyz\u00e9seinek feldolgoz\u00e1sa sor\u00e1n, ami a m\u00e1r felszabad\u00edtott mem\u00f3ria ter\u00fclet\u00e9hez (use-after-free) vezethet. Amikor egy ICMPv6 csomagot kapunk, amely a router hirdet\u00e9si \u00fczenetet (RA, Router Advertisement) tartalmazza, a h\u00e1l\u00f3zati stack megh\u00edvja az ndisc_router_discovery() funkci\u00f3t, amely, ha a RA \u00fczenetben forr\u00e1sid\u0151 adat tal\u00e1lhat\u00f3, megh\u00edvja a fib6_set_expires() funkci\u00f3t, \u00e9s kit\u00f6lti a gc_link strukt\u00far\u00e1t. Az elavult bejegyz\u00e9sek tiszt\u00edt\u00e1s\u00e1ra a fib6_clean_expires() funkci\u00f3t haszn\u00e1lj\u00e1k, amely lev\u00e1lasztja a bejegyz\u00e9st a gc_linkr\u0151l, \u00e9s felszabad\u00edtja a fib6_info strukt\u00fara \u00e1ltal haszn\u00e1lt mem\u00f3ri\u00e1t. Itt van egy szakasz, amikor a fib6_info strukt\u00fara mem\u00f3ri\u00e1ja m\u00e1r felszabad\u00edtva lett, de a r\u00e1 mutat\u00f3 hivatkoz\u00e1s m\u00e9g mindig a gc_link strukt\u00far\u00e1ban tal\u00e1lhat\u00f3. <\/p>\n

A sebezhet\u0151s\u00e9g a 6.6-os \u00e1gt\u00f3l kezdve l\u00e9p fel, \u00e9s a 6.6.9-es \u00e9s 6.7-es verzi\u00f3kban jav\u00edtva van. A sebezhet\u0151s\u00e9g jav\u00edt\u00e1s\u00e1nak \u00e1llapot\u00e1t a k\u00f6vetkez\u0151 disztrib\u00faci\u00f3k adatlapjain lehet \u00e9rt\u00e9kelni: Debian, Ubuntu, SUSE, RHEL, Fedora, Arch Linux, Gentoo, Slackware. Azok k\u00f6z\u00fcl a disztrib\u00faci\u00f3k k\u00f6z\u00fcl, amelyek a 6.6-os kernel csomagokat tartalmazz\u00e1k, megemelhetj\u00fck az Arch Linuxot, Gentoo-t, Fedora-t, Slackware-t, OpenMandriva-t \u00e9s Manjaro-t; a t\u00f6bbi disztrib\u00faci\u00f3 eset\u00e9ben nem z\u00e1rhat\u00f3 ki a visszamen\u0151leges v\u00e1ltoztat\u00e1sok b\u00e9t\u00e1pjai a r\u00e9gebbi kernel \u00e1gakba (p\u00e9ld\u00e1ul a Debian eml\u00edti, hogy a sebezhet\u0151 csomag a 6.5.13-as kernel, mik\u00f6zben a probl\u00e9m\u00e1s v\u00e1ltoztat\u00e1s a 6.6-os \u00e1gon jelent meg). V\u00e9delmi megold\u00e1sk\u00e9nt ki lehet kapcsolni az IPv6-ot, vagy a «net.ipv6.conf.*.accept_ra» param\u00e9terekhez gr\u00e9m\u00e9r 0 \u00e9rt\u00e9ket lehet rendelni.
\n
Forr\u00e1s: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043e\u0444\u043e\u0440\u043c\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u043f\u0430\u043a\u0435\u0442\u0430 ICMPv6 \u0441 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435\u043c RA (Router Advertisement), \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u043c \u0434\u043b\u044f \u0430\u043d\u043e\u043d\u0441\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u043e \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0435. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0442\u043e\u043b\u044c\u043a\u043e \u0438\u0437 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 \u0438 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441\u043e \u0432\u043a\u043b\u044e\u0447\u0451\u043d\u043d\u043e\u0439 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-113232","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47S\u00e9r\u00fcl\u00e9kenys\u00e9g az IPv6 veremben a Linux kernelben, amely t\u00e1voli k\u00f3dv\u00e9grehajt\u00e1st tesz 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\u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443.","og:url":"https:\/\/prohoster.info\/hu\/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\/hu\/wp-json\/wp\/v2\/posts\/113232","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/comments?post=113232"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/posts\/113232\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/media?parent=113232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/categories?post=113232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hu\/wp-json\/wp\/v2\/tags?post=113232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}