Ve voln\u00e9bsdov\u00e9m procesu rtsold a utilit\u011b rtsol byla zji\u0161t\u011bna zranitelnost (CVE-2025-14558), kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du s pr\u00e1vy root prost\u0159ednictv\u00edm odesl\u00e1n\u00ed speci\u00e1ln\u011b upraven\u00e9ho paketu s ozn\u00e1men\u00edm IPv6-routeru. RA zpr\u00e1vy (Router Advertisement), kter\u00e9 zranitelnost vyu\u017e\u00edvaj\u00ed, nejsou sm\u011brov\u00e1ny a m\u011bly by b\u00fdt routery odm\u00edt\u00e1ny. K proveden\u00ed \u00fatoku mus\u00ed \u00fato\u010dn\u00edk m\u00edt mo\u017enost odes\u00edlat speci\u00e1ln\u011b upraven\u00fd paket ze syst\u00e9mu, kter\u00fd se nach\u00e1z\u00ed ve stejn\u00e9m s\u00ed\u0165ov\u00e9m segmentu jako zraniteln\u00fd hostitel. <\/p>\n
Pozad\u00ed procesu rtsold se pou\u017e\u00edv\u00e1 na hostitel\u00edch pro automatick\u00e9 nastaven\u00ed p\u0159ipojen\u00ed p\u0159es IPv6 pomoc\u00ed mechanismu SLAAC (StateLess Address AutoConfiguration). Hostitel odes\u00edl\u00e1 ICMPv6 zpr\u00e1vu RS (Router Solicitation) v multicast re\u017eimu a \u010dek\u00e1 na p\u0159\u00edchoz\u00ed RA zpr\u00e1vy (Router Advertisement) od router\u016f, kter\u00e9 obsahuj\u00ed informace o s\u00ed\u0165ov\u00fdch prefixech a konfigura\u010dn\u00edch parametrech. N\u00e1stroj rtsol implementuje podobnou funk\u010dnost bez spu\u0161t\u011bn\u00ed pozad\u00ed procesu. <\/p>\n
Zranitelnost je zp\u016fsobena t\u00edm, \u017ee rtsold p\u0159ed\u00e1v\u00e1 uveden\u00fd v RA zpr\u00e1v\u011b seznam \u201edomain search\u201c do n\u00e1stroje resolvconf bez kontroly spr\u00e1vnosti a bez escapov\u00e1n\u00ed speci\u00e1ln\u00edch znak\u016f. N\u00e1stroj resolvconf je shell skript, kter\u00fd neprov\u00e1d\u00ed kontrolu vstupn\u00edch dat. K vyu\u017eit\u00ed zranitelnosti sta\u010d\u00ed odeslat RA paket s n\u00e1zvem dom\u00e9ny<\/a>, obsahuj\u00edc\u00edm speci\u00e1ln\u00ed znaky, nap\u0159\u00edklad \u201etest`id`test\u201c. Zranitelnost byla odstran\u011bna v aktualizac\u00edch FreeBSD 15.0-RELEASE-p1, 14.3-RELEASE-p7, 13.5-RELEASE-p8. <\/p>\n D\u00e1le byly v aktualizac\u00edch FreeBSD 14.3-RELEASE-p7 a 13.5-RELEASE-p8 (v\u011btev 15.x se probl\u00e9mu net\u00fdk\u00e1) odstran\u011bny zranitelnosti (CVE-2025-14769) v paketov\u00e9m filtru ipfw, kter\u00e9 umo\u017e\u0148uj\u00ed vyvolat DoS \u00fatok pomoc\u00ed odes\u00edl\u00e1n\u00ed speci\u00e1ln\u011b form\u00e1tovan\u00fdch paket\u016f. Zranitelnost se projevuje pouze p\u0159i pou\u017e\u00edv\u00e1n\u00ed direktivy \u201etcp-setmss\u201c v pravidlech ipfw. Probl\u00e9m zp\u016fsobuje, \u017ee zpracovatel tcp-setmss za ur\u010dit\u00fdch okolnost\u00ed m\u016f\u017ee uvolnit pam\u011b\u0165, ve kter\u00e9 jsou ulo\u017eena p\u0159ijat\u00e1 data paketu, a vr\u00e1tit chybu. Uveden\u00e1 chyba byla zpracovatelsk\u00fdm motorem pravidel ignorov\u00e1na, co\u017e vedlo k tomu, \u017ee n\u00e1sleduj\u00edc\u00ed pravidlo mohlo povolit pr\u016fchod paketu, jeho\u017e buffer s daty byl ji\u017e uvoln\u011bn, co\u017e vede k dereferencov\u00e1n\u00ed nulov\u00e9ho ukazatele. \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. RA-\u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f (Router Advertisement), \u0447\u0435\u0440\u0435\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043d\u0435 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0438\u0440\u0443\u044e\u0442\u0441\u044f \u0438 \u0434\u043e\u043b\u0436\u043d\u044b \u043e\u0442\u0431\u0440\u0430\u0441\u044b\u0432\u0430\u0442\u044c\u0441\u044f \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0442\u043e\u0440\u0430\u043c\u0438. \u0414\u043b\u044f \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u0430\u0442\u0430\u043a\u0438 \u0437\u043b\u043e\u0443\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u0438\u043a \u0434\u043e\u043b\u0436\u0435\u043d \u0438\u043c\u0435\u0442\u044c \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0438 \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 \u0441 \u0441\u0438\u0441\u0442\u0435\u043c\u044b, […]<\/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-152349","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\udd47Zranitelnost root v IPv6 autokonfiguraci ve FreeBSD | ProHoster","description":"Byl zji\u0161t\u011bn zranitelnost (CVE-2025-14558) v pozad\u00ed rtsold a n\u00e1stroje rtsol ve FreeBSD, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00e9 spu\u0161t\u011bn\u00ed k\u00f3du s pr\u00e1vy root zasl\u00e1n\u00edm speci\u00e1ln\u011b upraven\u00e9ho paketu.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/udalyonnaya-root-uyazvimost-v-obrabotchike-avtokonfiguraczii-ipv6-vo-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","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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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"