{"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\/da\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"S\u00e5rbarhed i IPv6-stakken i Linux-kernen, der tillader fjernudf\u00f8relse af kode","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Der er blevet afsl\u00f8ret oplysninger om s\u00e5rbarheden CVE-2023-6200 i Linux-kernens netv\u00e6rksstack, som i visse tilf\u00e6lde kan give en angriber fra det lokale netv\u00e6rk mulighed for at udf\u00f8re sin kode ved at sende et specielt udformet ICMPv6-pakke med en RA (Router Advertisement) besked, der er beregnet til at annoncere oplysninger om routeren. <\/p>\n

S\u00e5rbarheden kan kun udnyttes fra et lokalt netv\u00e6rk og optr\u00e6der i systemer med aktiveret IPv6-support og den aktive sysctl-parameter «net.ipv6.conf.<netv\u00e6rksinterface_navn>.accept_ra» (kan kontrolleres med kommandoen «sysctl net.ipv6.conf| grep accept_ra»), som som standard er deaktiveret i RHEL og Ubuntu for eksterne netv\u00e6rksinterfaces, men aktiveret for loopback-interface, hvilket tillader et angreb fra samme system. <\/p>\n

S\u00e5rbarheden opst\u00e5r p\u00e5 grund af en race condition ved behandlingen af for\u00e6ldede fib6_info-poster af garbage collection, hvilket kan f\u00f8re til adgang til et allerede frigivet hukommelsesomr\u00e5de (use-after-free). N\u00e5r en ICMPv6-pakke med en router advertisement (RA) besked modtages, kalder netv\u00e6rksstakken funktionen ndisc_router_discovery(), som, hvis RA-beskeden indeholder oplysninger om rutelevetiden, kalder funktionen fib6_set_expires() og fylder gc_link-strukturen. For at rense de for\u00e6ldede poster anvendes funktionen fib6_clean_expires(), som l\u00f8sner posten i gc_link og frigiver den hukommelse, der bruges af fib6_info-strukturen. P\u00e5 et bestemt tidspunkt er hukommelsen til fib6_info-strukturen allerede frigivet, men referencen til den forts\u00e6tter med at eksistere i gc_link-strukturen. <\/p>\n

S\u00e5rbarheden optr\u00e6der fra version 6.6 og er udbedret i version 6.6.9 og 6.7. Status for s\u00e5rbarhedslukning i distributioner kan vurderes p\u00e5 f\u00f8lgende sider: Debian, Ubuntu, SUSE, RHEL, Fedora, Arch Linux, Gentoo, Slackware. Blandt distributioner, der leverer pakker med kerne 6.6, kan n\u00e6vnes Arch Linux, Gentoo, Fedora, Slackware, OpenMandriva og Manjaro; i de \u00f8vrige distributioner er der mulighed for, at \u00e6ndringen bliver backportet med fejl til pakker med \u00e6ldre kerneversioner (for eksempel n\u00e6vner Debian, at pakken med kerne 6.5.13 er s\u00e5rbar, mens det problematiske \u00e6ndringspunkt kom i version 6.6). Som en midlertidig beskyttelsesmetode kan IPv6 deaktiveres eller v\u00e6rdien 0 tildeles parameterne «net.ipv6.conf.*.accept_ra».
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\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\udd47Vulnerability in the IPv6 stack of the Linux kernel allows remote code execution | ProHoster","description":"Information about the CVE-2023-6200 vulnerability has been revealed in the Linux kernel's network stack, which under certain circumstances allows an attacker from the local network to execute their code through sending.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-ipv6-steke-yadra-linux-dopuskayushhaya-udalyonnoe-vypolnenie-koda","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","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 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