{"id":81560,"date":"2020-05-14T19:42:19","date_gmt":"2020-05-14T17:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd"},"modified":"2020-05-14T19:42:19","modified_gmt":"2020-05-14T17:42:19","slug":"udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/udalyonno-ekspluatiruemye-uyazvimosti-vo-freebsd","title":{"rendered":"Vzd\u00e1len\u011b exploatovan\u00e9 zranitelnosti ve FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ve FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/thread.html\">bylo odstran\u011bno<\/a><\/noindex> P\u011bt zranitelnost\u00ed, mezi kter\u00fdmi jsou i probl\u00e9my, kter\u00e9 mohou potenci\u00e1ln\u011b v\u00e9st k p\u0159eps\u00e1n\u00ed dat na \u00farovni j\u00e1dra p\u0159i odes\u00edl\u00e1n\u00ed ur\u010dit\u00fdch s\u00ed\u0165ov\u00fdch paket\u016f, nebo umo\u017e\u0148uj\u00ed lok\u00e1ln\u00edmu u\u017eivateli zv\u00fd\u0161it sv\u00e9 opr\u00e1vn\u011bn\u00ed. Zranitelnosti byly opraveny ve verz\u00edch 12.1-RELEASE-p5 a 11.3-RELEASE-p9. <\/p>\n<p>Nejnebezpe\u010dn\u011bj\u0161\u00ed zranitelnost (<noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001950.html\">CVE-2020-7454<\/a><\/noindex>) je zp\u016fsobena nedostate\u010dnou kontrolou velikosti paketu v knihovn\u011b libalias p\u0159i anal\u00fdze specifick\u00fdch pro protokol hlavi\u010dek. Knihovna libalias se pou\u017e\u00edv\u00e1 v paketov\u00e9m filtru ipfw pro p\u0159eklad adres a zahrnuje standardn\u00ed funkce nahrazov\u00e1n\u00ed adres v IP paketech a anal\u00fdzu protokol\u016f. Zranitelnost umo\u017e\u0148uje prost\u0159ednictv\u00edm odes\u00edl\u00e1n\u00ed speci\u00e1ln\u011b form\u00e1tovan\u00e9ho s\u00ed\u0165ov\u00e9ho paketu dos\u00e1hnout \u010dten\u00ed nebo z\u00e1pisu dat v oblasti pam\u011bti j\u00e1dra (p\u0159i pou\u017eit\u00ed implementace NAT v j\u00e1d\u0159e) nebo procesu<br \/>\nnatd (p\u0159i pou\u017eit\u00ed implementace NAT ve u\u017eivatelsk\u00e9m prostoru). Probl\u00e9m se net\u00fdk\u00e1 konfigurac\u00ed NAT vytvo\u0159en\u00fdch pomoc\u00ed paketov\u00fdch filtr\u016f pf a ipf, ani konfigurac\u00ed ipfw, v nich\u017e se NAT nepou\u017e\u00edv\u00e1. <\/p>\n<p>Dal\u0161\u00ed zranitelnosti:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001951.html\">CVE-2020-7455<\/a><\/noindex> \u2014 dal\u0161\u00ed vzd\u00e1len\u011b zneu\u017eiteln\u00e1 zranitelnost v libalias, spojen\u00e1 s nespr\u00e1vn\u00fdm v\u00fdpo\u010dtem d\u00e9lky paket\u016f v FTP zpracovateli. Probl\u00e9m spo\u010d\u00edv\u00e1 v \u00faniku obsahu n\u011bkolika bajt\u016f dat z oblasti pam\u011bti j\u00e1dra nebo procesu natd.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001953.html\">CVE-2019-15879<\/a><\/noindex> \u2014 zranitelnost v modulu cryptodev, vyvolan\u00e1 p\u0159\u00edstupem k ji\u017e uvoln\u011bn\u00e9 oblasti pam\u011bti (use-after-free), co\u017e umo\u017e\u0148uje neprivilegovan\u00e9mu procesu p\u0159epsat libovoln\u00e9 \u010d\u00e1sti pam\u011bti j\u00e1dra. Jako obchvat blokov\u00e1n\u00ed zranitelnosti se doporu\u010duje odstar\u0148it modul cryptodev p\u0159\u00edkazem \u201ekldunload cryptodev\u201c, pokud byl na\u010dten (b\u011b\u017en\u011b nen\u00ed cryptodev na\u010dten). Modul cryptodev poskytuje aplikac\u00edm z u\u017eivatelsk\u00e9ho prostoru p\u0159\u00edstup k rozhran\u00ed \/dev\/crypto pro vol\u00e1n\u00ed mechanism\u016f hardwarov\u00e9ho urychlov\u00e1n\u00ed kryptografick\u00fdch operac\u00ed (v AES-NI a OpenSSL se \/dev\/crypto nepou\u017e\u00edv\u00e1).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001954.html\">CVE-2019-15880<\/a><\/noindex> \u2014 druh\u00e1 zranitelnost v cryptodev, kter\u00e1 umo\u017e\u0148uje neprivilegovan\u00e9mu u\u017eivateli vyvolat p\u00e1d j\u00e1dra t\u00edm, \u017ee ode\u0161le po\u017eadavek na proveden\u00ed kryptografick\u00e9 operace s nespr\u00e1vn\u00fdm MAC. Probl\u00e9m je zp\u016fsoben absenc\u00ed kontroly velikosti MAC kl\u00ed\u010de p\u0159i alokaci vyrovn\u00e1vac\u00ed pam\u011bti pro jeho ulo\u017een\u00ed (vyrovn\u00e1vac\u00ed pam\u011b\u0165 byla vytv\u00e1\u0159ena na z\u00e1klad\u011b u\u017eivatelsk\u00fdch dat o velikosti bez kontroly skute\u010dn\u00e9 velikosti).\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2020-May\/001952.html\">CVE-2019-15878<\/a><\/noindex> \u2014 zranitelnost v implementaci protokolu SCTP (Stream Control Transmission Protocol), zp\u016fsoben\u00e1 nespr\u00e1vnou kontrolou sd\u00edlen\u00e9ho kl\u00ed\u010de pou\u017eit\u00fdm roz\u0161\u00ed\u0159en\u00edm SCTP-AUTH pro autentizaci sekvenc\u00ed SCTP. Lok\u00e1ln\u00ed aplikace m\u016f\u017ee prost\u0159ednictv\u00edm Socket API aktualizovat kl\u00ed\u010d a sou\u010dasn\u011b p\u0159eru\u0161it spojen\u00ed SCTP, co\u017e vede k p\u0159\u00edstupu k ji\u017e uvoln\u011bn\u00e9 oblasti pam\u011bti (use-after-free).\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52948\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u044f\u0434\u0440\u0430 \u043f\u0440\u0438 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 \u0438\u043b\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u043b\u043e\u043a\u0430\u043b\u044c\u043d\u043e\u043c\u0443 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u044b \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.1-RELEASE-p5 \u0438 11.3-RELEASE-p9. \u041d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043e\u043f\u0430\u0441\u043d\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-7454) \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u0434\u043e\u043b\u0436\u043d\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0440\u0430\u0437\u043c\u0435\u0440\u0430 \u043f\u0430\u043a\u0435\u0442\u0430 \u0432 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0435 libalias \u043f\u0440\u0438 \u0440\u0430\u0437\u0431\u043e\u0440\u0435 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0445 \u0434\u043b\u044f [&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-81560","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412\u043e FreeBSD \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u043e \u043f\u044f\u0442\u044c \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0441\u0440\u0435\u0434\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0438\u043c\u0435\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e.\" \/>\n\t<meta name=\"robots\" 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