{"id":181730,"date":"2026-05-25T20:48:13","date_gmt":"2026-05-25T18:48:14","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/7-novyh-uyazvimostej-v-freebsd"},"modified":"2026-05-25T20:48:13","modified_gmt":"2026-05-25T18:48:14","slug":"7-novyh-uyazvimostej-v-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/7-novyh-uyazvimostej-v-freebsd","title":{"rendered":"7 nov\u00fdch zranitelnost\u00ed ve FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

20. kv\u011btna 2026 v\u00fdvoj\u00e1\u0159i FreeBSD ozn\u00e1mili opravu sedmi nov\u00fdch zranitelnost\u00ed v syst\u00e9mu. Ne v\u0161echny jsou stejn\u011b nebezpe\u010dn\u00e9, ale n\u011bkter\u00e9 jsou velmi z\u00e1va\u017en\u00e9.
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CVE-2026-45251<\/a> — use-after-free v select-podobn\u00fdch syscally, pokud maj\u00ed ve sv\u00e9m seznamu \u010dek\u00e1n\u00ed deskriptory proces\u016f (v FreeBSD 15 — dal\u0161\u00ed nov\u00e9 deskriptory jail-\u016f), a tyto deskriptory byly uzav\u0159eny v jin\u00e9m vl\u00e1kn\u011b, zat\u00edmco \u010dekaj\u00edc\u00ed syscal st\u00e1le z\u016fstal na \u010dek\u00e1n\u00ed. Podle tohoto commitu<\/a>, jsou tak\u00e9 ovlivn\u011bny deskriptory souvisej\u00edc\u00ed s netmap (ovlada\u010dem urychlen\u00e9ho p\u0159\u00edstupu k s\u00ed\u0165ov\u00e9mu adapt\u00e9ru), ale na toto t\u00e9ma nejsou ofici\u00e1ln\u00ed informace. Deskriptory proces\u016f se objevily ve FreeBSD 9, tak\u017ee zranitelnost pravd\u011bpodobn\u011b existuje od t\u00e9 doby. V ofici\u00e1ln\u00edm prohl\u00e1\u0161en\u00ed je uvedeno, \u017ee tato zranitelnost umo\u017e\u0148uje z\u00edsk\u00e1n\u00ed privilegovan\u00fdch pr\u00e1v superu\u017eivatele. Neexistuj\u00ed \u017e\u00e1dn\u00e9 mo\u017enosti, jak ji neutralizovat bez patche\/aktualizace.<\/p>\n

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CVE-2026-45250<\/a> — chybn\u00e9 v\u00fdpo\u010dty velikosti bufferu a n\u00e1sledn\u00e9 p\u0159eps\u00e1n\u00ed mimo buffer ve z\u00e1sobn\u00edku p\u0159i syst\u00e9mov\u00e9m vol\u00e1n\u00ed setcred, p\u0159i\u010dem\u017e i p\u0159esto, \u017ee setcred s\u00e1m vy\u017eaduje root-privilegie, po\u0161kozen\u00ed z\u00e1sobn\u00edku nast\u00e1v\u00e1 je\u0161t\u011b p\u0159ed t\u00edm, ne\u017e jsou privilegium ov\u011b\u0159ena, a tud\u00ed\u017e je dostupn\u00e1 v\u0161em. Tento syst\u00e9mov\u00fd vol\u00e1n\u00ed se objevilo ve FreeBSD 14.3 (tj. d\u0159\u00edv\u011bj\u0161\u00ed verze nejsou ovlivn\u011bny) a nab\u00edz\u00ed zp\u016fsob, jak nastavit v\u0161echny identifik\u00e1tory u\u017eivatele a skupin aktu\u00e1ln\u00edho procesu jedn\u00edm vol\u00e1n\u00edm, nam\u00edsto kombinac\u00ed setuid+setgid+setgroups a podobn\u011b. Zranitelnost umo\u017e\u0148uje spou\u0161t\u011bt \u0161kodliv\u00fd k\u00f3d v kontextu j\u00e1dra. Nen\u00ed mo\u017en\u00e9 ji neutralizovat bez patche\/aktualizace.<\/p>\n

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CVE-2026-45252<\/a> — absence kontroly p\u0159\u00edtomnosti koncov\u00e9ho nuly p\u0159ed zkop\u00edrov\u00e1n\u00edm \u0159et\u011bzce z\u00edskan\u00e9ho od fuse-d\u00e9mona do nov\u00e9ho bufferu. Nicm\u00e9n\u011b, kontrola maxim\u00e1ln\u00ed velikosti kop\u00edrov\u00e1n\u00ed tam je, a v\u00edce ne\u017e 253 zbyte\u010dn\u00fdch byt\u016f z pam\u011bti j\u00e1dra p\u0159e\u010d\u00edst nelze. A tak\u00e9 lze zapsat a\u017e 250 byt\u016f do «nealokovan\u00e9ho j\u00e1dro heap prostoru». Ve v\u00fdchoz\u00edm nastaven\u00ed ve freebsd je zak\u00e1z\u00e1no montov\u00e1n\u00ed souborov\u00fdch syst\u00e9m\u016f ne-root u\u017eivateli, a tedy pro p\u0159edlo\u017een\u00ed j\u00e1dru zlovoln\u00e9ho fuse-d\u00e9mona je pot\u0159eba b\u00fdt root. Av\u0161ak pokud je sysctl vfs.usermount=1 — syst\u00e9m se st\u00e1v\u00e1 zraniteln\u00fdm i pro b\u011b\u017en\u00e9 u\u017eivatele. Je tak\u00e9 t\u0159eba zohlednit nebezpe\u010d\u00ed fuse-d\u00e9mona v jailu, kde m\u016f\u017ee b\u00fdt tak\u00e9 root (ale ve v\u00fdchoz\u00edm nastaven\u00ed je to tak\u00e9 zak\u00e1z\u00e1no).<\/p>\n

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CVE-2026-45253<\/a> — p\u0159i pou\u017eit\u00ed ptrace byla mo\u017enost spustit ve lad\u011bn\u00e9m procesu syst\u00e9mov\u00e9 vol\u00e1n\u00ed s nespr\u00e1vn\u00fdm \u010d\u00edslem, co\u017e vedlo k prov\u00e1d\u011bn\u00ed k\u00f3du v j\u00e1d\u0159e, kter\u00fd nebyl ur\u010den\u00fd k spu\u0161t\u011bn\u00ed jako syst\u00e9mov\u00e9 vol\u00e1n\u00ed, s potenci\u00e1ln\u011b \u0161patn\u00fdmi n\u00e1sledky. Pokud je nastaveno security.bsd.unprivileged_proc_debug=0 (co\u017e je dobr\u00e1 praxe pro servery v ka\u017ed\u00e9m p\u0159\u00edpad\u011b, a instal\u00e1tor syst\u00e9mu to dokonce nab\u00edz\u00ed prov\u00e9st voliteln\u011b), pak u\u017eivatelsk\u00e9 a jailed procesy nebudou moci pou\u017e\u00edvat ptrace a t\u00edmto zranitelnost z\u016fstane dostupn\u00e1 pouze rootu.<\/p>\n

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CVE-2026-45255<\/a> — injekce shellov\u00fdch p\u0159\u00edkaz\u016f s pr\u00e1vy root v bsdinstall\/bsdconfig prost\u0159ednictv\u00edm n\u00e1zv\u016f zlovoln\u00fdch bezdr\u00e1tov\u00fdch s\u00edt\u00ed, kter\u00e9 zde nebyly escapesn\u00e9, v moment\u011b prohl\u00ed\u017een\u00ed jejich seznamu. Aby se t\u00e9to zranitelnosti p\u0159ede\u0161lo, sta\u010d\u00ed neshl\u00ed\u017eet na seznam bezdr\u00e1tov\u00fdch s\u00edt\u00ed z bsdinstall\/bsdconfig.<\/p>\n

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CVE-2026-39461<\/a>, CVE-2026-45254<\/a> — zranitelnosti v knihovn\u011b libcasper (ne v j\u00e1d\u0159e). Knihovna je ur\u010dena pro bezpe\u010dn\u00e9 p\u0159izp\u016fsobiteln\u00e9 poskytov\u00e1n\u00ed slu\u017eeb proces\u016fm um\u00edst\u011bn\u00fdm v p\u00edse\u010dn\u00e9 bou\u0159i. Jedna ze zranitelnost\u00ed souvis\u00ed s p\u0159ete\u010den\u00edm z\u00e1sobn\u00edku a po\u0161kozen\u00edm z\u00e1sobn\u00edku organizov\u00e1n\u00edm ve t\u00e9to knihovn\u011b souborov\u00fdch popisova\u010d\u016f s vysok\u00fdmi \u010d\u00edsly (byla navr\u017eena pro \u010d\u00edsla do 1024  — v\u00fdchoz\u00ed limit struktur pro syscalls select). Druh\u00e1 zranitelnost — mo\u017enost odstra\u0148ovat stanoven\u00e9 seznamy omezen\u00ed (ideologie knihovny spo\u010d\u00edv\u00e1 v tom, \u017ee jednou stanoven\u00e1 omezen\u00ed na proces mohou b\u00fdt pouze zp\u0159\u00edsn\u011bna) cap_net.<\/p>\n

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Opraven\u00e9 verze syst\u00e9mu maj\u00ed \u010d\u00edsla: 14.3-RELEASE-p14, 14.4-RELEASE-p5 a 15.0-RELEASE-p9. Tak\u00e9 stoj\u00ed za zm\u00ednku n\u011bkter\u00fd d\u016fle\u017eit\u00fd moment: vyd\u00e1n\u00ed FreeBSD 13.5 bylo ned\u00e1vno ukon\u010deno — 30. dubna 2026, a pro n\u011bj (a pro v\u011btev 13.x obecn\u011b) u\u017e nejsou ofici\u00e1ln\u00ed opravy. Nicm\u00e9n\u011b pokud z n\u011bjak\u00e9ho d\u016fvodu zat\u00edm nechcete sp\u011bchat s p\u0159echodem na verzi 14.x, patche pro verzi 14.3 jsou celkov\u011b pou\u017eiteln\u00e9 i pro zdrojov\u00e9 k\u00f3dy 13.5, a CVE-2026-45250 pro v\u011btev 13. nen\u00ed aktu\u00e1ln\u00ed vzhledem k absenci setcred().<\/p>\n

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Zdroj: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

20 \u043c\u0430\u044f 2026 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 FreeBSD \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e\u0431 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u0441\u0435\u043c\u0438 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041d\u0435 \u0432\u0441\u0435 \u043e\u043d\u0438 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u043e \u043e\u043f\u0430\u0441\u043d\u044b, \u043d\u043e \u0435\u0441\u0442\u044c \u0438 \u043a\u0440\u0430\u0439\u043d\u0435 \u043d\u0435\u043f\u0440\u0438\u044f\u0442\u043d\u044b\u0435. CVE-2026-45251 — use-after-free \u0432 select-\u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u0441\u0438\u0441\u043a\u043e\u043b\u043b\u0430\u0445, \u0435\u0441\u043b\u0438 \u0432 \u0438\u0445 \u0441\u043f\u0438\u0441\u043a\u0435 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u0434\u0435\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0440\u044b \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 (\u0432 FreeBSD 15 — \u0435\u0449\u0451 \u043d\u043e\u0432\u044b\u0435 \u0434\u0435\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0440\u044b jail-\u043e\u0432), \u0438 \u044d\u0442\u0438 \u0434\u0435\u0441\u043a\u0440\u0438\u043f\u0442\u043e\u0440\u044b \u0431\u044b\u043b\u0438 \u0437\u0430\u043a\u0440\u044b\u0442\u044b \u0432 \u0434\u0440\u0443\u0433\u043e\u043c \u043f\u043e\u0442\u043e\u043a\u0435 \u043f\u043e\u043a\u0430 \u043e\u0436\u0438\u0434\u0430\u044e\u0449\u0438\u0439 \u0441\u0438\u0441\u043a\u043e\u043b\u043b […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181730","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\udd477 nov\u00fdch zranitelnost\u00ed ve FreeBSD | ProHoster","description":"20. kv\u011btna 2026 v\u00fdvoj\u00e1\u0159i FreeBSD ozn\u00e1mili opravu sedmi nov\u00fdch zranitelnost\u00ed v syst\u00e9mu. Ne v\u0161echny jsou stejn\u011b nebezpe\u010dn\u00e9, ale n\u011bkter\u00e9 jsou velmi z\u00e1va\u017en\u00e9.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/7-novyh-uyazvimostej-v-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\udd477 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 FreeBSD | ProHoster","og:description":"20 \u043c\u0430\u044f 2026 \u0433\u043e\u0434\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 FreeBSD \u043e\u0431\u044a\u044f\u0432\u0438\u043b\u0438 \u043e\u0431 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0438 \u0441\u0435\u043c\u0438 \u043d\u043e\u0432\u044b\u0445 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u0441\u0438\u0441\u0442\u0435\u043c\u0435. \u041d\u0435 \u0432\u0441\u0435 \u043e\u043d\u0438 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u043e \u043e\u043f\u0430\u0441\u043d\u044b, \u043d\u043e \u0435\u0441\u0442\u044c \u0438 \u043a\u0440\u0430\u0439\u043d\u0435 \u043d\u0435\u043f\u0440\u0438\u044f\u0442\u043d\u044b\u0435.","og:url":"https:\/\/prohoster.info\/cs\/blog\/news\/7-novyh-uyazvimostej-v-freebsd","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":"2026-05-25T18:48:14+00:00","article:modified_time":"2026-05-25T18:48:14+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\/cs\/wp-json\/wp\/v2\/posts\/181730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/comments?post=181730"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/posts\/181730\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/media?parent=181730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/categories?post=181730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/cs\/wp-json\/wp\/v2\/tags?post=181730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}