{"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\/da\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Fjernbetjent DoS-s\u00e5rbarhed i IPv6-stakken FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">er blevet l\u00f8st<\/a><\/noindex> s\u00e5rbarhed (CVE-2019-5611), der muligg\u00f8r nedbrud af kernen (packet-of-death) ved at sende specielt fragmenterede ICMPv6 MLD-pakker (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Multicast Listener Discovery<\/a><\/noindex>). Problemet <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">er for\u00e5rsaget<\/a><\/noindex> af mangel p\u00e5 n\u00f8dvendige kontroller i kaldet til m_pulldown(), hvilket kan f\u00f8re til, at ikke-continuous k\u00e6der af mbufs returneres, i strid med kaldesidens forventninger.<\/p>\n<p>S\u00e5rbarhed <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">er blevet l\u00f8st<\/a><\/noindex> i opdateringerne 12.0-RELEASE-p10, 11.3-RELEASE-p3 og 11.2-RELEASE-p14. Som en midlertidig beskyttelse kan st\u00f8tte til fragmentering for IPv6 deaktiveres eller muligheder i headeren filtreres p\u00e5 en firewall <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Det er interessant, at den fejl, der f\u00f8rte til s\u00e5rbarheden, blev opdaget allerede i 2006 og rettet i OpenBSD, NetBSD og macOS, men forblev urettet i FreeBSD, p\u00e5 trods af at FreeBSD-udviklerne blev underrettet om problemet.<\/p>\n<p>Derudover kan det n\u00e6vnes, at der er rettet to andre s\u00e5rbarheder i 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 overbelastning af t\u00e6lleren for links til datakonstruktioner i mqueuefs ved brug af 32-bit biblioteker i et 64-bit milj\u00f8 (32-bit compat). Problemet opst\u00e5r, n\u00e5r mqueuefs aktiveres, hvilket ikke er tilf\u00e6ldet som standard, og kan f\u00f8re til adgang til filer, kataloger og sockets \u00e5bnet af processer, der ejes af andre brugere, eller til at organisere adgang til eksterne filer fra jail-milj\u00f8et. Med root-adgang i jail giver s\u00e5rbarheden mulighed for at opn\u00e5 root-adgang i v\u00e6rtsmilj\u00f8et.\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 ved multitr\u00e5dig adgang til enheden \/dev\/midistat, hvor en race condition kan f\u00f8re til l\u00e6sning af kernehukommelsesomr\u00e5der uden for gr\u00e6nserne for midistat-bufferen. P\u00e5 32-bit systemer medf\u00f8rer et fors\u00f8g p\u00e5 at udnytte s\u00e5rbarheden, at kernen crasher, mens det p\u00e5 64-bit systemer giver mulighed for at f\u00e5 adgang til indholdet af vilk\u00e5rlige kernehukommelsesomr\u00e5der.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <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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