{"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\/pt\/blog\/news\/udalyonnaya-dos-uyazvimost-v-ipv6-steke-freebsd","title":{"rendered":"Vulnerabilidade remota de DoS na pilha IPv6 do FreeBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>No FreeBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/lists.freebsd.org\/pipermail\/freebsd-announce\/2019-August\/001908.html\">no lan\u00e7amento<\/a><\/noindex> a vulnerabilidade (CVE-2019-5611) permite causar uma falha no kernel (packet-of-death) atrav\u00e9s do envio de pacotes ICMPv6 MLD especialmente fragmentados (<noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/rfc2710\">Descoberta de Multicast Listener<\/a><\/noindex>). O problema <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/BSD\/comments\/c4krwr\/freebsd_ipv6_remote_dingdong_attack_kernel_panic\/\">\u00e9 causado<\/a><\/noindex> pela falta de uma verifica\u00e7\u00e3o necess\u00e1ria na chamada m_pulldown(), o que pode levar ao retorno de cadeias mbufs n\u00e3o cont\u00ednuas, contrariando as expectativas da parte que chama.<\/p>\n<p>Vulnerabilidade <noindex><a rel=\"nofollow\" href=\"https:\/\/svnweb.freebsd.org\/base?view=revision&#038;revision=350815\">no lan\u00e7amento<\/a><\/noindex> nas atualiza\u00e7\u00f5es 12.0-RELEASE-p10, 11.3-RELEASE-p3 e 11.2-RELEASE-p14. Como uma solu\u00e7\u00e3o alternativa de prote\u00e7\u00e3o, pode-se desativar o suporte \u00e0 fragmenta\u00e7\u00e3o para IPv6 ou filtrar no firewall as op\u00e7\u00f5es no cabe\u00e7alho <noindex><a rel=\"nofollow\" href=\"https:\/\/tools.ietf.org\/html\/draft-ietf-6man-hbh-header-handling-03\">HBH<\/a><\/noindex> (Hop-by-Hop). Curiosamente, o erro que leva \u00e0 vulnerabilidade foi identificado em 2006 e corrigido no OpenBSD, NetBSD e macOS, mas permaneceu sem corre\u00e7\u00e3o no FreeBSD, apesar de os desenvolvedores do FreeBSD terem sido informados sobre o problema.<\/p>\n<p>Tamb\u00e9m \u00e9 importante mencionar a corre\u00e7\u00e3o de mais duas vulnerabilidades no 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 estouro do contador de links em estruturas de dados no mqueuefs ao usar bibliotecas de 32 bits em um ambiente de 64 bits (compatibilidade de 32 bits). O problema se manifesta ao habilitar o mqueuefs, que n\u00e3o est\u00e1 ativo por padr\u00e3o, e pode resultar em acesso a arquivos, diret\u00f3rios e sockets abertos por processos pertencentes a outros usu\u00e1rios ou na organiza\u00e7\u00e3o de acesso a arquivos externos a partir de um ambiente jail. Com acesso root no jail, a vulnerabilidade permite obter acesso root no ambiente do host.\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 problema de acesso multithread ao dispositivo \/dev\/midistat em um estado de corrida que pode levar \u00e0 leitura de \u00e1reas de mem\u00f3ria do kernel fora dos limites do buffer alocado para midistat. Em sistemas de 32 bits, a tentativa de explora\u00e7\u00e3o da vulnerabilidade resulta na queda do kernel, enquanto em sistemas de 64 bits permite acessar o conte\u00fado de \u00e1reas arbitr\u00e1rias da mem\u00f3ria do kernel.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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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