{"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\/sv\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Fj\u00e4rr DoS-s\u00e5rbarhet i IPv6-stacken i 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\">har \u00e5tg\u00e4rdats<\/a><\/noindex> s\u00e5rbarhet (CVE-2019-5611) som g\u00f6r det m\u00f6jligt att orsaka en krasch av k\u00e4rnan (packet-of-death) genom att skicka speciellt fragmenterade ICMPv6 MLD-paket (<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\/\">orsakas<\/a><\/noindex> ligger i avsaknaden av n\u00f6dv\u00e4ndig kontroll vid anropet av m_pulldown(), vilket kan leda till att icke-sammanh\u00e4ngande kedjor av mbufs returneras, i strid med f\u00f6rv\u00e4ntningarna hos anroparen.<\/p>\n<p>S\u00e5rbarhet <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">har \u00e5tg\u00e4rdats<\/a><\/noindex> i uppdateringarna 12.0-RELEASE-p10, 11.3-RELEASE-p3 och 11.2-RELEASE-p14. Som en skyddande workaround kan man st\u00e4nga av st\u00f6d f\u00f6r fragmentering f\u00f6r IPv6 eller filtrera p\u00e5 brandv\u00e4ggen f\u00f6r alternativ i headern <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Intressant nog uppt\u00e4cktes den felaktighet som ledde till s\u00e5rbarheten redan 2006 och \u00e5tg\u00e4rdades i OpenBSD, NetBSD och macOS, men f\u00f6rblev o\u00e5tg\u00e4rdad i FreeBSD, trots att utvecklarna av FreeBSD informerades om problemet.<\/p>\n<p>Det kan ocks\u00e5 noteras att ytterligare tv\u00e5 s\u00e5rbarheter har \u00e5tg\u00e4rdats 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 \u00f6verfl\u00f6de av l\u00e4nkr\u00e4knare i datakonstruktioner i mqueuefs vid anv\u00e4ndning av 32-bitarsbibliotek i en 64-bitarsmilj\u00f6 (32-bitarskompatibilitet). Problemet uppst\u00e5r n\u00e4r mqueuefs aktiveras, vilket inte \u00e4r aktiverat som standard, och kan leda till \u00e5tkomst till filer, kataloger och sockets som \u00f6ppnas av processer som tillh\u00f6r andra anv\u00e4ndare, eller f\u00f6r att organisera \u00e5tkomst till externa filer fr\u00e5n en jail-milj\u00f6. Med root-\u00e5tkomst i jail ger s\u00e5rbarheten m\u00f6jlighet att f\u00e5 root-\u00e5tkomst p\u00e5 v\u00e4rdmilj\u00f6n.\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 vid flertr\u00e5dad \u00e5tkomst till enhet \/dev\/midistat vid f\u00f6rekomst av ett t\u00e4vlingsf\u00f6rh\u00e5llande kan leda till l\u00e4sning av minnesomr\u00e5den i k\u00e4rnan utanf\u00f6r gr\u00e4nserna f\u00f6r den tilldelade midistat-bufferten. P\u00e5 32-bitarsystem leder ett f\u00f6rs\u00f6k att utnyttja s\u00e5rbarheten till att k\u00e4rnan kraschar, medan det p\u00e5 64-bitarsystem till\u00e5ter att inneh\u00e5llet i godtyckliga minnesomr\u00e5den i k\u00e4rnan avsl\u00f6jas.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>K\u00e4lla: <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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