{"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\/ro\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Vulnerabilitate DoS la distan\u021b\u0103 \u00een stiva IPv6 FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">remediat\u0103<\/a><\/noindex> vulnerabilitate (CVE-2019-5611) care permite provocarea unei c\u0103deri a nucleului (packet-of-death) prin trimiterea de pachete ICMPv6 MLD special fragmentate (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Descoperirea Listener Multicast<\/a><\/noindex>). Problema <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">provocat\u0103<\/a><\/noindex> const\u0103 \u00een lipsa verific\u0103rii necesare \u00een apelul m_pulldown(), ceea ce poate duce la returnarea unor lan\u021buri mbufs necontinuate, contrar a\u0219tept\u0103rilor apelantului.<\/p>\n<p>Vulnerabilitatea <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">remediat\u0103<\/a><\/noindex> \u00een actualiz\u0103rile 12.0-RELEASE-p10, 11.3-RELEASE-p3 \u0219i 11.2-RELEASE-p14. Drept solu\u021bie provizorie de protec\u021bie, se poate dezactiva suportul pentru fragmentare pentru IPv6 sau se pot filtra op\u021biunile din antet prin firewall <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Este interesant c\u0103 eroarea care duce la vulnerabilitate a fost identificat\u0103 \u00eenc\u0103 din 2006 \u0219i a fost corectat\u0103 \u00een OpenBSD, NetBSD \u0219i macOS, dar a r\u0103mas necorectat\u0103 \u00een FreeBSD, \u00een ciuda faptului c\u0103 dezvoltatorii FreeBSD au fost alerta\u021bi cu privire la problem\u0103.<\/p>\n<p>De asemenea, se poate men\u021biona corectarea a dou\u0103 vulnerabilit\u0103\u021bi \u00een 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 Overflow of the link counter for data structures in mqueuefs when using 32-bit libraries in a 64-bit environment (32-bit compat). The issue manifests when mqueuefs is activated, which is off by default, and can lead to unauthorized access to files, directories, and sockets open by processes owned by other users, or to granting access to external files from a jail environment. If a user has root access in the jail, the vulnerability allows escalation to root access on the host side.\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 A problem with multithreaded access to the device \/dev\/midistat can lead to reading areas of kernel memory outside the bounds allocated for the midistat buffer due to a race condition. On 32-bit systems, attempting to exploit the vulnerability results in a kernel crash, whereas on 64-bit systems it allows one to read the contents of arbitrary areas of kernel memory.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Sursa: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51332\">opennet.ro<\/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 5.0.2.1 - aioseo.com -->\n\t<meta name=\"description\" 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