{"id":152349,"date":"2025-12-22T17:12:34","date_gmt":"2025-12-22T15:12:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd"},"modified":"2025-12-22T17:12:34","modified_gmt":"2025-12-22T15:12:34","slug":"udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","title":{"rendered":"Fjernet root-s\u00e5rbarhed i IPv6 autokonfigurationshandleren i FreeBSD.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I FreeBSD anvendt i baggrundsprocessen rtsold og v\u00e6rkt\u00f8jet rtsol er der opdaget en s\u00e5rbarhed (CVE-2025-14558), der muligg\u00f8r fjernudf\u00f8relse af kode med root-rettigheder ved at sende et specielt formateret pakke med et IPv6-routerannonce. RA-beskeder (Router Advertisement), som udnytter s\u00e5rbarheden, bliver ikke routet og skal kasseres af routere. For at kunne udf\u00f8re et angreb skal en angriber have mulighed for at sende et specielt formateret pakke fra et system, der er i samme netv\u00e6rkssegment som den s\u00e5rbare v\u00e6rt. <\/p>\n

Baggrundsprocessen rtsold anvendes p\u00e5 v\u00e6rter til automatisk at konfigurere forbindelsen via IPv6 ved hj\u00e6lp af SLAAC (StateLess Address AutoConfiguration) mekanismen. V\u00e6rten sender en ICMPv6-besked RS (Router Solicitation) i multicast-tilstand og venter p\u00e5 at modtage svarende RA-beskeder (Router Advertisement) fra routere, som indeholder oplysninger om netv\u00e6rksprefixer og konfigurationsparametre. V\u00e6rkt\u00f8jet rtsol implementerer en lignende funktionalitet uden at k\u00f8re en baggrundsproces. <\/p>\n

S\u00e5rbarheden skyldes, at rtsold overf\u00f8rer den i RA-meddelelsen angivne liste \"domain search\" til v\u00e6rkt\u00f8jet resolvconf uden validering og uden at undslippe specialtegn. V\u00e6rkt\u00f8jet resolvconf er et shell-script, der ikke kontrollerer inputdata. For at udnytte s\u00e5rbarheden er det tilstr\u00e6kkeligt at sende en RA-pakke med navnet dom\u00e6net<\/a>, der indeholder specialtegn, for eksempel \"test`id`test. S\u00e5rbarheden er blevet rettet i opdateringen FreeBSD 15.0-RELEASE-p1, 14.3-RELEASE-p7, 13.5-RELEASE-p8. <\/p>\n

Derudover er s\u00e5rbarheden (CVE-2025-14769) i pakke-filteret ipfw blevet rettet i opdateringerne FreeBSD 14.3-RELEASE-p7 og 13.5-RELEASE-p8 (problemet ber\u00f8rer ikke version 15.x), hvilket muligg\u00f8r en denial of service ved at sende specielt formaterede pakker. S\u00e5rbarheden forekommer kun ved brug af direktivet \"tcp-setmss\" i ipfw-reglerne. Problemet skyldes, at tcp-setmss-behandleren under visse omst\u00e6ndigheder kan frigive hukommelsen, hvori de modtagne pakke-data opbevares, og returnere en fejl. Den angivne fejl blev ignoreret af regelsbehandlingsmotoren, hvilket bet\u00f8d, at det efterf\u00f8lgende regel kunne tillade passage af en pakke, hvis data-buffer allerede var frigivet, hvilket f\u00f8rer til dereferencering af en nulpeger.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 rtsol \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-14558), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \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 c \u0430\u043d\u043e\u043d\u0441\u043e\u043c IPv6-\u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430. 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v\u00e6rkt\u00f8jet rtsol i FreeBSD har en s\u00e5rbarhed (CVE-2025-14558), som muligg\u00f8r fjernudf\u00f8relse af kode med root-rettigheder ved at sende en specielt tilpasset pakke.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","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\u0434\u0430\u043b\u0451\u043d\u043d\u0430\u044f root-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 \u0430\u0432\u0442\u043e\u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0438 IPv6 \u0432\u043e FreeBSD | ProHoster","og:description":"\u0412 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0432\u043e FreeBSD \u0444\u043e\u043d\u043e\u0432\u043e\u043c \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 rtsold \u0438 \u0443\u0442\u0438\u043b\u0438\u0442\u0435 rtsol \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2025-14558), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u0443\u0434\u0430\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043a\u043e\u0434\u0430 \u0441 \u043f\u0440\u0430\u0432\u0430\u043c\u0438 root \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 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