{"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\/hr\/blog\/news\/7-novyh-uyazvimostej-v-freebsd","title":{"rendered":"7 novih ranjivosti u FreeBSD-u","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Dana 20. svibnja 2026. godine, programeri FreeBSD-a objavili su ispravak za sedam novih ranjivosti u sustavu. Nisu sve one jednako opasne, ali postoje i vrlo neugodne.
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CVE-2026-45251<\/a> — use-after-free u select-sli\u010dnim sustavnim pozivima, ako u njihovom \u010dekanju postoje deskriptor proces\u00e2 (u FreeBSD 15 — jo\u0161 novi deskriptor jail-ova), i ti su deskriptori zatvoreni u drugom niti dok je \u010dekaju\u0107i sustavni poziv jo\u0161 uvijek bio u \u010dekanju. Sude\u0107i po ovoj promjeni<\/a>, tako\u0111er su pogo\u0111eni deskriptori povezani s netmap (voza\u010dem za ubrzani izravni pristup mre\u017enom adapteru), no za tu informaciju nema slu\u017ebenih podataka. Deskriptori procesa uvedeni su u FreeBSD 9, tako da ranjivost vjerojatno postoji od tada. U slu\u017ebenoj izjavi navedeno je da ranjivost omogu\u0107ava sticanje privilegija superusera. Nema mogu\u0107nosti za njen neutralizaciju bez zakrpe\/izvoda.<\/p>\n

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CVE-2026-45250<\/a> — neto\u010dan izra\u010dun veli\u010dine bafera i kasnije pisanje izvan bafera na stogu u sustavnom pozivu setcred, unato\u010d tome \u0161to setcred sama zahtijeva root privilegije, uni\u0161tavanje stoga se doga\u0111a prije nego \u0161to su privilegije provjerene i stoga je dostupna svima. Ovaj sustavni poziv pojavio se u FreeBSD 14.3 (to jest, ranije verzije nisu zahva\u0107ene) i pru\u017ea na\u010din da se postave svi identifikatori korisnika i grupa trenutnog procesa u 1 pozivu, umjesto kombinacija setuid+setgid+setgroups i sli\u010dnog. Ranljivost omogu\u0107ava izvr\u0161avanje zlo\u0107udnog koda u kontekstu jezgre. Mogu\u0107nosti njezinog neutraliziranja bez zakrpe\/azuriranja nema.<\/p>\n

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CVE-2026-45252<\/a> — nedostatak provjere postojanja zavr\u0161nog nula prije kopiranja niza, primljenog od fuse-demona, u novi bafer. Ipak, provjera na maksimalnu veli\u010dinu kopiranja postoji i vi\u0161e od 253 suvi\u0161nih bajtova iz jezgre se ne mo\u017ee pro\u010ditati. Tako\u0111er, mogu\u0107e je zapisati do 250 bajtova u «unallocated kernel heap space». Po defaultu u freebsd-u je zabranjeno montiranje datote\u010dnih sustava od strane ne-root korisnika, \u0161to zna\u010di da za uvla\u010denje zlo\u0107udnog fuse-demona u jezgru treba biti root. Me\u0111utim, ako je sysctl vfs.usermount=1 — sustav postaje ranjiv i za obi\u010dne korisnike. Tako\u0111er treba uzeti u obzir opasnost fuse-demona u jail-u, gdje mo\u017ee biti i root (ali po defaultu je to tako\u0111er zabranjeno).<\/p>\n

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CVE-2026-45253<\/a> — prilikom kori\u0161tenja ptrace postojala je mogu\u0107nost pokretanja sustavnog poziva s neto\u010dnim brojem u procesu koji se debuggira, \u0161to je dovodilo do izvr\u0161avanja koda u jezgri, koji nije predvi\u0111en za pokretanje kao sustavni poziv, s potencijalno lo\u0161im posljedicama. Ako je postavljeno security.bsd.unprivileged_proc_debug=0 (\u0161to je dobra praksa za servere u svakom slu\u010daju, a instalacijski sustav to \u010dak nudi kao opciju), tada korisni\u010dki i jailed procesi ne mogu koristiti ptrace i tako \u0107e ranjivost ostati dostupna samo root-u.<\/p>\n

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CVE-2026-45255<\/a> — injekcija shell komandi s root pravima u bsdinstall\/bsdconfig putem imena zlonamjernih be\u017ei\u010dnih mre\u017ea, koja nisu bila escapirana prilikom pregleda njihove liste. Da biste izbjegli ovu ranjivost, dovoljno je ne pregledavati popis be\u017ei\u010dnih mre\u017ea iz bsdinstall\/bsdconfig.<\/p>\n

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CVE-2026-39461<\/a>, CVE-2026-45254<\/a> — ranjivosti u biblioteci libcasper (ne u kernelu). Biblioteka je namijenjena sigurnom, prilagodljivom pru\u017eanju usluga procesima koji su stavljeni u sandbox. Jedna od ranjivosti povezana je s prekora\u010denjem granice bafera u steku i o\u0161te\u0107enjem steka putem organiziranja u ovoj biblioteci datote\u010dnih deskriptora s velikim brojevima (bila je izra\u010dunata na brojeve do 1024 — zadani limit struktura za sistemski poziv select). Druga ranjivost — mogu\u0107nost uklanjanja nametnutih lista ograni\u010denja (ideologija biblioteke je da jednom nametnuta ograni\u010denja na proces mogu biti samo poja\u010dana) cap_net.<\/p>\n

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Ispravljene verzije sistema imaju brojeve: 14.3-RELEASE-p14, 14.4-RELEASE-p5 i 15.0-RELEASE-p9. Tako\u0111er valja napomenuti za neke va\u017enu stvar: izdanje FreeBSD 13.5 je nedavno uklonjeno iz podr\u0161ke — 30. travnja 2026. godine, i za njega (i za 13.x granu uop\u0107e) vi\u0161e nema slu\u017ebenih ispravki. Me\u0111utim, ako iz nekog razloga ne \u017eelite \u017euriti s prijelazom na 14.x izdanje, zakrpe za verziju 14.3 u cjelini su prikladne i za izvor kod 13.5, a CVE-2026-45250 za 13. granu nije relevantna zbog odsutnosti setcred().<\/p>\n

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Izvor: 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 novih ranjivosti u FreeBSD | ProHoster","description":"Dana 20. svibnja 2026. godine, programeri FreeBSD-a objavili su ispravak za sedam novih ranjivosti u sustavu. Nisu sve one jednako opasne, ali postoje i vrlo neugodne.","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/7-novyh-uyazvimostej-v-freebsd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","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\/hr\/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\/hr\/wp-json\/wp\/v2\/posts\/181730","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/comments?post=181730"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/posts\/181730\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/media?parent=181730"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/categories?post=181730"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/hr\/wp-json\/wp\/v2\/tags?post=181730"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}