{"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\/pl\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Zdalna podatno\u015b\u0107 DoS w stosie IPv6 FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>W FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">naprawiono<\/a><\/noindex> luk\u0119 (CVE-2019-5611), kt\u00f3ra pozwala\u0142a na wywo\u0142anie awarii j\u0105dra (packet-of-death) poprzez wys\u0142anie specjalnie podzielonych pakiet\u00f3w ICMPv6 MLD (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Odkrycie Multicast Listener<\/a><\/noindex>). Problem <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">jest spowodowany<\/a><\/noindex> brakiem niezb\u0119dnej weryfikacji w wywo\u0142aniu m_pulldown(), co mo\u017ce prowadzi\u0107 do zwr\u00f3cenia nieci\u0105g\u0142ych \u0142a\u0144cuch\u00f3w mbufs, wbrew oczekiwaniom wywo\u0142uj\u0105cego.<\/p>\n<p>Luka <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">naprawiono<\/a><\/noindex> w aktualizacjach 12.0-RELEASE-p10, 11.3-RELEASE-p3 oraz 11.2-RELEASE-p14. Jako obej\u015bcie zabezpiecze\u0144 mo\u017cna wy\u0142\u0105czy\u0107 obs\u0142ug\u0119 fragmentacji dla IPv6 lub filtrowa\u0107 w zaporze opcje w nag\u0142\u00f3wku <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Interesuj\u0105ce jest to, \u017ce b\u0142\u0105d prowadz\u0105cy do luki zosta\u0142 wykryty ju\u017c w 2006 roku i naprawiony w OpenBSD, NetBSD oraz macOS, ale pozosta\u0142 nierozwi\u0105zany w FreeBSD, mimo \u017ce deweloperzy FreeBSD zostali powiadomieni o problemie.<\/p>\n<p>Mo\u017cna r\u00f3wnie\u017c zauwa\u017cy\u0107 naprawienie w FreeBSD jeszcze dw\u00f3ch luk:<\/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 przepe\u0142nienie licznika odniesie\u0144 do struktur danych w mqueuefs przy u\u017cyciu 32-bitowych bibliotek w 64-bitowym \u015brodowisku (32-bit compat). Problem wyst\u0119puje przy w\u0142\u0105czeniu mqueuefs, kt\u00f3re nie jest domy\u015blnie aktywne, i mo\u017ce prowadzi\u0107 do uzyskania dost\u0119pu do plik\u00f3w, katalog\u00f3w oraz socket\u00f3w otwartych przez procesy nale\u017c\u0105ce do innych u\u017cytkownik\u00f3w lub do zorganizowania dost\u0119pu do zewn\u0119trznych plik\u00f3w z \u015brodowiska jail. Przy posiadaniu dost\u0119pu roota w jail, luka pozwala na uzyskanie dost\u0119pu roota w \u015brodowisku hosta.\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 problem przy wielow\u0105tkowym dost\u0119pie do urz\u0105dzenia \/dev\/midistat, gdy wyst\u0119puje stan wy\u015bcigu, mo\u017ce prowadzi\u0107 do odczytu obszar\u00f3w pami\u0119ci j\u0105dra poza granicami przydzielonego bufora dla midistat. W systemach 32-bitowych pr\u00f3ba wykorzystania luki prowadzi do awarii j\u0105dra, a w 64-bitowych pozwala na poznanie zawarto\u015bci przypadkowych obszar\u00f3w pami\u0119ci j\u0105dra.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <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\" 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