{"id":119374,"date":"2024-08-12T09:43:01","date_gmt":"2024-08-12T07:43:01","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda"},"modified":"2024-08-12T09:43:01","modified_gmt":"2024-08-12T07:43:01","slug":"uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/uyazvimost-v-postavlyaemom-vo-freebsd-variante-openssh-dopuskayushhaya-udalyonnoe-vypolnenie-koda","title":{"rendered":"Ranljivost u verziji OpenSSH isporu\u010denoj s FreeBSD, koja omogu\u0107uje daljinsko izvr\u0161avanje koda","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>U serveru OpenSSH isporu\u010denom s FreeBSD otkrivena je ranljivost (CVE-2024-7589) koja omogu\u0107ava daljinsko izvr\u0161avanje koda s root pravima bez prolaska autentifikacije. Ranljivost je varijanta problema otkrivenog po\u010detkom srpnja u OpenSSH (CVE-2024-6387) i tako\u0111er je uzrokovana uvjetom utrke koji nastaje zbog izvr\u0161avanja u handleru signala funkcija koje nisu bile dizajnirane za pozivanje u asinkronom re\u017eimu.       <\/p>\n<p>Razvija\u010di FreeBSD su odmah nakon najave ispravili izvorni srpanjski nedostatak, ali ispravka nije pokrivala sve mogu\u0107e vektore napada. Ispravka se sastojala od onemogu\u0107avanja poziva funkcije sshlogv, koja dinami\u010dki alocira memoriju, \u0161to je u asinkronom izvr\u0161avanju moglo dovesti do o\u0161te\u0107enja unutarnjih struktura malloc pri aktivaciji handlera signala SIGALRM tijekom izvr\u0161avanja odre\u0111enog koda. Kako se pokazalo, sli\u010dan problem se javljao u specifi\u010dnom za FreeBSD pozivu funkcije blacklist_notify, koja osigurava integraciju s pozadinskim procesom blacklistd.       <\/p>\n<p>Osim primjene zakrpe, ranjivost se mo\u017ee blokirati postavljanjem parametra \"LoginGraceTime=0\" u \/etc\/ssh\/sshd_config. Me\u0111utim, onemogu\u0107avanje vremenskog ograni\u010denja olak\u0161ava pokretanje napada uskra\u0107ivanja usluga kada se uspostavi veliki broj veza koje prema\u0161uju limite postavljene parametrima MaxStartups.     <\/p>\n<p>Osim toga, ispravljen je jo\u0161 tri ranjivosti u FreeBSD:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2024-6760 \u2014 mogu\u0107nost zaobila\u017eenja za\u0161tite od kori\u0161tenja ktrace za pra\u0107enje suid procesa, \u0161to omogu\u0107ava neprivilegiranom korisniku pristup sadr\u017eaju datoteka za koje nema prava \u010ditanja, na primjer, mo\u017ee pro\u010ditati sadr\u017eaj datoteke s hashovima lozinki korisnika.\n<li class=\"l\"> CVE-2024-6759 \u2014 u NFS klijentu otkrivena je mogu\u0107nost kori\u0161tenja simbola razdvajanja putanja \"..\" i \"\/\" u nazivima datoteka;\n<li class=\"l\"> CVE-2024-6640 \u2014 ranjivost u paketnom filtru PF, zbog koje ICMPv6 paketi s nulom identifikatorom nisu podlijegali pravilima vatrozida namijenjenim za refleksiju ulaznih paketa u tablici stanja.    <\/ul>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61690\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 \u0441\u043e\u0441\u0442\u0430\u0432\u0435 FreeBSD \u0441\u0435\u0440\u0432\u0435\u0440\u0435 OpenSSH \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2024-7589), \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 \u0431\u0435\u0437 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0430\u0443\u0442\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u043e\u043c \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u043e\u0439 \u0432 \u043d\u0430\u0447\u0430\u043b\u0435 \u0438\u044e\u043b\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 OpenSSH (CVE-2024-6387) \u0438 \u0442\u0430\u043a\u0436\u0435 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435\u043c \u0433\u043e\u043d\u043a\u0438, \u0432\u043e\u0437\u043d\u0438\u043a\u0430\u044e\u0449\u0435\u043c \u0438\u0437-\u0437\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0435 \u0441\u0438\u0433\u043d\u0430\u043b\u043e\u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0439, \u043d\u0435 \u0440\u0430\u0441\u0441\u0447\u0438\u0442\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0432\u044b\u0437\u043e\u0432 \u0432 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u043c \u0440\u0435\u0436\u0438\u043c\u0435. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u043b\u0438 \u0438\u0441\u0445\u043e\u0434\u043d\u0443\u044e [&hellip;]<\/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-119374","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 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