{"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\/et\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Kaugjuurdep\u00e4\u00e4su DoS-haavatavus FreeBSD IPv6-kihis","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>FreeBSD-is <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">on k\u00f5rvaldatud<\/a><\/noindex> haavatavus (CVE-2019-5611), mis v\u00f5imaldab k\u00e4ivitada tuuma languse (packet-of-death) l\u00e4bi spetsiaalselt fragmenteeritud ICMPv6 MLD paketide saatmise (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Multicast Listener Discovery<\/a><\/noindex>). Probleem <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">on p\u00f5hjustatud<\/a><\/noindex> on vajalikku kontrolli m_pulldown() kutses, mis v\u00f5ib viia mittet\u00e4ielike mbuf-seoste tagastamiseni, vastupidiselt kutsuja ootustele.<\/p>\n<p>Haavatavus <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">on k\u00f5rvaldatud<\/a><\/noindex> 12.0-RELEASE-p10, 11.3-RELEASE-p3 ja 11.2-RELEASE-p14 uuendustes. Kaitseks v\u00f5ib IPv6-fragmentimise toe v\u00e4ljal\u00fclitamine v\u00f5i rikka vahepealse filtriviibimise valikute filtreerimine firewallis olla lahendus. <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Huvi pakub, et haavatavuseni viiv viga tuvastati juba 2006. aastal ja k\u00f5rvaldatakse OpenBSD-s, NetBSD-s ja macOS-is, kuid j\u00e4i FreeBSD-s parandamata, kuigi FreeBSD arendajaid on probleemist teavitatud.<\/p>\n<p>Samuti on FreeBSD-s k\u00f5rvaldatud kaks muud haavatavust:<\/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 mqueuefs-i andmeestruktuuri linkide arvesti \u00fclet\u00e4itumine 32-bitiste raamatukogude kasutamisel 64-bitistes keskkondades (32-bitine \u00fchilduvus). Probleem ilmneb mqueuefsi aktiveerimisel, mis ei ole vaikimisi sisse l\u00fclitatud, ja see v\u00f5ib viia juurdep\u00e4\u00e4suni failidele, kataloogidele ja socket'itele, mille on avanud teised kasutajad, v\u00f5i v\u00f5imaldada juurdep\u00e4\u00e4su v\u00e4listele failidele jail-keskkonnast. Kui kasutajal on jailis root-juurdep\u00e4\u00e4s, v\u00f5imaldab haavatavus saada root-juurdep\u00e4\u00e4su host-keskkonna k\u00fcljes.\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 probleem mitme l\u00f5ime juurdep\u00e4\u00e4suga seadmele \/dev\/midistat, mille tulemuseks on v\u00f5idujooksu seisund, mis v\u00f5ib viia kuni tuumam\u00e4lu alade lugemine v\u00e4ljaspool midistati puhvrile eraldatud piire. 32-bitistes s\u00fcsteemides viib haavatavuse ekspluateerimise katse tuuma kokkuvarisemiseni, samas kui 64-bitistes s\u00fcsteemides on v\u00f5imalik teada saada suvaliste tuumam\u00e4lu alade sisu.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Allikas: <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 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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\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\u0434\u0430\u043b\u0451\u043d\u043d\u0430\u044f DoS-\u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 IPv6-\u0441\u0442\u0435\u043a\u0435 FreeBSD | ProHoster","og:description":"\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 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