{"id":99255,"date":"2021-02-24T16:22:40","date_gmt":"2021-02-24T14:22:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-vo-freebsd-pozvolyayushhie-obojti-ogranicheniya-jail-okruzhenij"},"modified":"2021-02-24T16:22:40","modified_gmt":"2021-02-24T14:22:40","slug":"uyazvimosti-vo-freebsd-pozvolyayushhie-obojti-ogranicheniya-jail-okruzhenij","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-vo-freebsd-pozvolyayushhie-obojti-ogranicheniya-jail-okruzhenij","title":{"rendered":"Zranitelnosti ve FreeBSD, kter\u00e9 umo\u017e\u0148uj\u00ed obch\u00e1zet omezen\u00ed jail\u016f","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ve vyv\u00edjen\u00e9m projektu FreeBSD syst\u00e9mu izolovan\u00fdch prost\u0159ed\u00ed jail byly odhaleny dv\u011b zranitelnosti:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-25582 \u2014 zranitelnost v implementaci syst\u00e9mov\u00e9ho vol\u00e1n\u00ed jail_attach, ur\u010den\u00e9ho k p\u0159ipojen\u00ed extern\u00edch proces\u016f k existuj\u00edc\u00edm jail-ovk\u016fm. Probl\u00e9m se projevuje b\u011bhem vol\u00e1n\u00ed jail_attach pomoc\u00ed p\u0159\u00edkaz\u016f jexec nebo killall a umo\u017e\u0148uje privilegovan\u00e9mu procesu, izolovan\u00e9mu uvnit\u0159 jail, zm\u011bnit sv\u016fj ko\u0159enov\u00fd adres\u00e1\u0159 a z\u00edskat pln\u00fd p\u0159\u00edstup ke v\u0161em soubor\u016fm a adres\u00e1\u0159\u016fm v syst\u00e9mu.\n<li class=\"l\"> CVE-2020-25581 \u2014 stav z\u00e1vodu p\u0159i odstra\u0148ov\u00e1n\u00ed proces\u016f pomoc\u00ed syst\u00e9mov\u00e9ho vol\u00e1n\u00ed jail_remove umo\u017e\u0148uje b\u011b\u017e\u00edc\u00edmu privilegovan\u00e9mu procesu uvnit\u0159 jail vyhnout se odstran\u011bn\u00ed p\u0159i ukon\u010den\u00ed pr\u00e1ce jail a z\u00edskat pln\u00fd p\u0159\u00edstup k syst\u00e9mu p\u0159es devfs p\u0159i n\u00e1sledn\u00e9m spu\u0161t\u011bn\u00ed jail se stejn\u00fdm ko\u0159enov\u00fdm adres\u00e1\u0159em, vyu\u017e\u00edvaj\u00edc okam\u017eik, kdy je devfs ji\u017e p\u0159ipojen pro jail, ale pravidla izolace je\u0161t\u011b nebyla pou\u017eita.    <\/ul>\n<p>D\u00e1le lze zm\u00ednit zranitelnost (CVE-2020-25580) v PAM modulu pam_login_access, odpov\u00eddaj\u00edc\u00ed za zpracov\u00e1n\u00ed souboru login_access, ve kter\u00e9m jsou ur\u010dena pravidla p\u0159\u00edstupu u\u017eivatel\u016f a skupin, aplikovan\u00e1 p\u0159i p\u0159ihl\u00e1\u0161en\u00ed do syst\u00e9mu (ve v\u00fdchoz\u00edm nastaven\u00ed je povoleno p\u0159ihl\u00e1\u0161en\u00ed p\u0159es konzoli, sshd a telnetd). Zranitelnost umo\u017e\u0148uje obej\u00edt omezen\u00ed login_access a prov\u00e9st p\u0159ihl\u00e1\u0161en\u00ed, navzdory existenci zakazuj\u00edc\u00edch pravidel.    <\/p>\n<p>Zranitelnosti byly odstran\u011bny ve v\u011btv\u00edch 13.0-STABLE, 12.2-STABLE a 11.4-STABLE, stejn\u011b jako v opravn\u00fdch aktualizac\u00edch FreeBSD 12.2-RELEASE-p4 a 11.4-RELEASE-p8.<br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=54642\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c FreeBSD \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0439 jail \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438: CVE-2020-25582 &#8212; \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u043d\u043e\u0433\u043e \u0432\u044b\u0437\u043e\u0432\u0430 jail_attach, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u043e\u0433\u043e \u0434\u043b\u044f \u043f\u0440\u0438\u043a\u0440\u0435\u043f\u043b\u0435\u043d\u0438\u044f \u0432\u043d\u0435\u0448\u043d\u0438\u0445 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0432 \u043a \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u043c jail-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f\u043c. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0432\u043e \u0432\u0440\u0435\u043c\u044f \u0432\u044b\u0437\u043e\u0432\u0430 jail_attach \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043a\u043e\u043c\u0430\u043d\u0434 jexec \u0438\u043b\u0438 killall, \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443, \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u0432\u043d\u0443\u0442\u0440\u0438 jail, \u0438\u0437\u043c\u0435\u043d\u0438\u0442\u044c \u0441\u0432\u043e\u0439 \u043a\u043e\u0440\u043d\u0435\u0432\u043e\u0439 \u043a\u0430\u0442\u0430\u043b\u043e\u0433 \u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043f\u043e\u043b\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f \u043a\u043e [&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-99255","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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zranitelnost v implementaci syst\u00e9mov\u00e9ho vol\u00e1n\u00ed jail_attach, ur\u010den\u00e9ho pro p\u0159ipojen\u00ed.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimosti-vo-freebsd-pozvolyayushhie-obojti-ogranicheniya-jail-okruzhenij","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\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432\u043e FreeBSD, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0435 \u043e\u0431\u043e\u0439\u0442\u0438 \u043e\u0433\u0440\u0430\u043d\u0438\u0447\u0435\u043d\u0438\u044f jail-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0439 | ProHoster","og:description":"\u0412 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c FreeBSD \u0441\u0438\u0441\u0442\u0435\u043c\u0435 \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0439 jail \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b \u0434\u0432\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438: CVE-2020-25582 - 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