{"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\/hu\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"T\u00e1voli DoS sebezhet\u0151s\u00e9g az IPv6 FreeBSD-stekben","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">eliminates<\/a><\/noindex> A sebezhet\u0151s\u00e9g (CVE-2019-5611), amely lehet\u0151v\u00e9 teszi a kernel \u00f6sszeoml\u00e1s\u00e1t (packet-of-death) kifejezetten fragment\u00e1lt ICMPv6 MLD csomagok k\u00fcld\u00e9s\u00e9vel (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Multicast Listener Discovery<\/a><\/noindex>). A probl\u00e9ma <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">is caused by<\/a><\/noindex> a m_pulldown() h\u00edv\u00e1s\u00e1nak sz\u00fcks\u00e9ges ellen\u0151rz\u00e9s\u00e9nek hi\u00e1ny\u00e1ban \u00e1ll, ami megszak\u00edtott mbuf l\u00e1ncok visszat\u00e9r\u00e9s\u00e9hez vezethet, ellent\u00e9tben a h\u00edv\u00f3 f\u00e9l elv\u00e1r\u00e1saival.<\/p>\n<p>S\u00e9r\u00fcl\u00e9kenys\u00e9g <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">eliminates<\/a><\/noindex> a 12.0-RELEASE-p10, 11.3-RELEASE-p3 \u00e9s 11.2-RELEASE-p14 friss\u00edt\u00e9sekben. V\u00e9delmi megold\u00e1sk\u00e9nt le lehet tiltani a fragment\u00e1l\u00e1s t\u00e1mogat\u00e1s\u00e1t IPv6 eset\u00e9n, vagy t\u0171zfalon sz\u0171rni a fejl\u00e9cek opci\u00f3it. <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). \u00c9rdekes, hogy a sebezhet\u0151s\u00e9get okoz\u00f3 hiba m\u00e1r 2006-ban felfedez\u00e9sre ker\u00fclt \u00e9s jav\u00edt\u00e1sra ker\u00fclt az OpenBSD, NetBSD \u00e9s macOS rendszerekben, de a FreeBSD-ben megmaradt jav\u00edtatlanul, annak ellen\u00e9re, hogy a FreeBSD fejleszt\u0151it \u00e9rtes\u00edtett\u00e9k a probl\u00e9m\u00e1r\u00f3l.<\/p>\n<p>Tov\u00e1bb\u00e1 \u00e9rdemes megeml\u00edteni a FreeBSD-ben t\u00f6rt\u00e9nt k\u00e9t sebezhet\u0151s\u00e9g megsz\u00fcntet\u00e9s\u00e9t is:<\/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 A hivatkoz\u00e1si sz\u00e1ml\u00e1l\u00f3 t\u00falt\u00f6lt\u00e9se adatstrukt\u00far\u00e1k mqueuefs-ben 32 bites k\u00f6nyvt\u00e1rak haszn\u00e1latakor 64 bites k\u00f6rnyezetben (32-bit compat). A probl\u00e9ma akkor jelentkezik, amikor a mqueuefs be van kapcsolva, ami alap\u00e9rtelmez\u00e9s szerint inakt\u00edv, \u00e9s hozz\u00e1f\u00e9r\u00e9st eredm\u00e9nyezhet m\u00e1s felhaszn\u00e1l\u00f3k \u00e1ltal birtokolt folyamatok \u00e1ltal megnyitott f\u00e1jlokhoz, k\u00f6nyvt\u00e1rakhoz \u00e9s socketekhez, vagy lehet\u0151v\u00e9 teheti a k\u00fcls\u0151 f\u00e1jlok el\u00e9rhet\u0151s\u00e9g\u00e9t jail-k\u00f6rnyezetben. Ha a felhaszn\u00e1l\u00f3nak root-hozz\u00e1f\u00e9r\u00e9se van a jail-en bel\u00fcl, a sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi a root-hozz\u00e1f\u00e9r\u00e9st a host-k\u00f6rnyezet oldal\u00e1n.\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\u00e9ma a \/dev\/midistat eszk\u00f6z t\u00f6bb sz\u00e1l\u00fa el\u00e9r\u00e9s\u00e9n\u00e9l, amely verseny\u00e1llapothoz vezethet, \u00e9s mem\u00f3riater\u00fcletek olvas\u00e1s\u00e1hoz vezethet a kernel hat\u00e1rain k\u00edv\u00fcl, a midistat pufferen k\u00edv\u00fcl. 32 bites rendszereken a sebezhet\u0151s\u00e9g kihaszn\u00e1l\u00e1s\u00e1nak k\u00eds\u00e9rlete a kernel \u00f6sszeoml\u00e1s\u00e1hoz vezet, m\u00edg 64 bites rendszereken lehet\u0151v\u00e9 teszi tetsz\u0151leges kernel mem\u00f3riater\u00fcletek tartalm\u00e1nak megismer\u00e9s\u00e9t.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <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 5.0.3 - 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 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