{"id":37361,"date":"2019-10-31T22:17:12","date_gmt":"2019-10-31T19:17:12","guid":{"rendered":"https:\/\/prohoster.info\/blog\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd\/"},"modified":"2019-10-31T22:17:12","modified_gmt":"2019-10-31T19:17:12","slug":"udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Vzd\u00e1len\u00e1 DoS zranitelnost v IPv6 z\u00e1sobn\u00edku 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\/2019-August\/001908.html\">odstran\u011bna<\/a><\/noindex> zranitelnost (CVE-2019-5611), kter\u00e1 umo\u017e\u0148uje vyvol\u00e1n\u00ed p\u00e1du j\u00e1dra (packet-of-death) prost\u0159ednictv\u00edm odesl\u00e1n\u00ed speci\u00e1ln\u011b fragmentovan\u00fdch paket\u016f ICMPv6 MLD (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Multicast Listener Discovery<\/a><\/noindex>). Probl\u00e9m <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">byl zp\u016fsoben<\/a><\/noindex> neexistuj\u00edc\u00ed kontrolou ve vol\u00e1n\u00ed m_pulldown(), co\u017e m\u016f\u017ee v\u00e9st k vr\u00e1cen\u00ed nep\u0159etr\u017eit\u00fdch \u0159et\u011bzc\u016f mbufs, v rozporu s o\u010dek\u00e1v\u00e1n\u00edm volaj\u00edc\u00ed strany.<\/p>\n<p>Zranitelnost <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">odstran\u011bna<\/a><\/noindex> v aktualizac\u00edch 12.0-RELEASE-p10, 11.3-RELEASE-p3 a 11.2-RELEASE-p14. Jako ochrann\u00e9 \u0159e\u0161en\u00ed lze zak\u00e1zat podporu fragmentace pro IPv6 nebo filtrovat na firewallech mo\u017enosti v hlavi\u010dce <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Zaj\u00edmav\u00e9 je, \u017ee probl\u00e9m vedouc\u00ed k zranitelnosti byl identifikov\u00e1n ji\u017e v roce 2006 a odstran\u011bn v OpenBSD, NetBSD a macOS, ale z\u016fstal neopraven\u00fd ve FreeBSD, p\u0159esto\u017ee byli v\u00fdvoj\u00e1\u0159i FreeBSD o probl\u00e9mu informov\u00e1ni.<\/p>\n<p>Tak\u00e9 lze poznamenat odstran\u011bn\u00ed dal\u0161\u00edch dvou zranitelnost\u00ed ve FreeBSD:<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001910.html\">CVE-2019-5603<\/a><\/noindex> \u2014 p\u0159ete\u010den\u00ed po\u010d\u00edtadla odkaz\u016f ve struktu\u0159e dat v mqueuefs p\u0159i pou\u017eit\u00ed 32bitov\u00fdch knihoven ve 64bitov\u00e9m prost\u0159ed\u00ed (32-bit compat). Probl\u00e9m se projevuje p\u0159i zapnut\u00ed mqueuefs, kter\u00e9 nen\u00ed ve v\u00fdchoz\u00edm nastaven\u00ed aktivn\u00ed, a m\u016f\u017ee v\u00e9st k p\u0159\u00edstupu k soubor\u016fm, adres\u00e1\u0159\u016fm a soket\u016fm, kter\u00e9 jsou otev\u0159eny procesy pat\u0159\u00edc\u00edmi jin\u00fdm u\u017eivatel\u016fm, nebo k vytvo\u0159en\u00ed p\u0159\u00edstupu k extern\u00edm soubor\u016fm z jail- prost\u0159ed\u00ed. Pokud m\u00e1 u\u017eivatel root p\u0159\u00edstup v jail, zranitelnost umo\u017e\u0148uje z\u00edskat root p\u0159\u00edstup na stran\u011b hostitelstv\u00ed.\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001909.html\">CVE-2019-5612<\/a><\/noindex> \u2014 probl\u00e9m p\u0159i v\u00edcetr\u00e9ninkov\u00e9m p\u0159\u00edstupu k za\u0159\u00edzen\u00ed \/dev\/midistat v d\u016fsledku z\u00e1vodn\u00edho stavu m\u016f\u017ee v\u00e9st k p\u0159e\u010dten\u00ed oblast\u00ed pam\u011bti j\u00e1dra mimo hranice vyhrazen\u00e9ho bufferu pro midistat. Na 32bitov\u00fdch syst\u00e9mech pokus o vyu\u017eit\u00ed zranitelnosti vede ke zhroucen\u00ed j\u00e1dra, zat\u00edmco na 64bitov\u00fdch syst\u00e9mech umo\u017e\u0148uje zjistit obsah libovoln\u00fdch oblast\u00ed pam\u011bti j\u00e1dra.\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=51332\">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\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-5611), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u043a\u0440\u0430\u0445 \u044f\u0434\u0440\u0430 (packet-of-death) \u0447\u0435\u0440\u0435\u0437 \u043e\u0442\u043f\u0440\u0430\u0432\u043a\u0443 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043f\u0430\u043a\u0435\u0442\u043e\u0432 ICMPv6 MLD (Multicast Listener Discovery). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0439 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0432 \u0432\u044b\u0437\u043e\u0432\u0435 m_pulldown(), \u0447\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u0432\u043e\u0437\u0432\u0440\u0430\u0442\u0443 \u043d\u0435 \u043d\u0435\u043f\u0440\u0435\u0440\u044b\u0432\u043d\u044b\u0445 \u0446\u0435\u043f\u043e\u0447\u0435\u043a mbufs, \u0432\u043e\u043f\u0440\u0435\u043a\u0438 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f \u0432\u044b\u0437\u044b\u0432\u0430\u044e\u0449\u0435\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b. \u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f\u0445 12.0-RELEASE-p10, 11.3-RELEASE-p3 \u0438 11.2-RELEASE-p14. \u0412 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043e\u0431\u0445\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0443\u0442\u0438 \u0437\u0430\u0449\u0438\u0442\u044b \u043c\u043e\u0436\u043d\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-37361","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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