{"id":100142,"date":"2021-05-12T10:22:35","date_gmt":"2021-05-12T08:22:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi"},"modified":"2021-05-12T10:22:35","modified_gmt":"2021-05-12T08:22:39","slug":"fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/fragattacks-seriya-uyazvimostej-standartah-i-realizacziyah-wi-fi","title":{"rendered":"FragAttacks \u2014 uma s\u00e9rie de vulnerabilidades nos padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Mathy Vanhoef, autor do ataque KRACK em redes sem fio, revelou informa\u00e7\u00f5es sobre 12 vulnerabilidades que afetam diversos dispositivos sem fio. Os problemas identificados s\u00e3o conhecidos pelo codinome FragAttacks e abrangem praticamente todas as placas e pontos de acesso sem fio em uso \u2014 dos 75 dispositivos testados, cada um foi suscet\u00edvel a pelo menos um dos m\u00e9todos de ataque propostos.     <\/p>\n<p>As vulnerabilidades s\u00e3o divididas em duas categorias: 3 vulnerabilidades foram identificadas diretamente nos padr\u00f5es Wi-Fi e abrangem todos os dispositivos que suportam os padr\u00f5es atuais IEEE 802.11 (os problemas est\u00e3o presentes desde 1997). 9 vulnerabilidades referem-se a erros e falhas em implementa\u00e7\u00f5es espec\u00edficas de pilhas sem fio. A segunda categoria representa um maior perigo, pois a organiza\u00e7\u00e3o de ataques a falhas nos padr\u00f5es requer configura\u00e7\u00f5es espec\u00edficas ou a realiza\u00e7\u00e3o de determinadas a\u00e7\u00f5es pela v\u00edtima. Todas as vulnerabilidades se manifestam independentemente do uso de protocolos de seguran\u00e7a Wi-Fi, incluindo o uso de WPA3.    <\/p>\n<p>A maioria dos m\u00e9todos de ataque identificados permite que um invasor realize a substitui\u00e7\u00e3o de quadros L2 em uma rede protegida, o que possibilita a intercep\u00e7\u00e3o do tr\u00e1fego da v\u00edtima. Um cen\u00e1rio de ataque mencionado como o mais realista envolve a falsifica\u00e7\u00e3o de respostas DNS para direcionar o usu\u00e1rio ao host do atacante. Tamb\u00e9m \u00e9 fornecido um exemplo de uso das vulnerabilidades para contornar o tradutor de endere\u00e7os em um roteador sem fio e estabelecer acesso direto ao dispositivo na rede local ou ignorar as restri\u00e7\u00f5es do firewall. A segunda parte das vulnerabilidades, relacionada ao processamento de quadros fragmentados, permite a extra\u00e7\u00e3o de dados sobre o tr\u00e1fego em uma rede sem fio e a intercepta\u00e7\u00e3o de dados do usu\u00e1rio transmitidos sem o uso de criptografia.     <\/p>\n<p>Um pesquisador preparou uma demonstra\u00e7\u00e3o mostrando como as vulnerabilidades podem ser usadas para capturar senhas transmitidas ao acessar sites via protocolo HTTP sem criptografia. Tamb\u00e9m foi demonstrado como atacar uma tomada inteligente gerenciada via Wi-Fi e us\u00e1-la como uma plataforma para continuar o ataque a dispositivos desatualizados na rede local, que possuem vulnerabilidades n\u00e3o corrigidas (por exemplo, foi poss\u00edvel contornar o NAT para atacar um computador com Windows 7 desatualizado na rede interna).            <center><div class=\"youtube-placeholder\" data-id=\"88YZ4061tYw\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/88YZ4061tYw\/hqdefault.jpg\" alt=\"Por que no hosting comum a administra\u00e7\u00e3o do PrestaShop \u00e9 lenta, e no seu n\u00e3o \u00e9?\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center>    <\/p>\n<p>Para explorar as vulnerabilidades, o atacante deve estar ao alcance do dispositivo sem fio alvo para enviar um pacote de quadros especialmente formatado \u00e0 v\u00edtima. Os problemas afetam dispositivos do cliente e placas sem fio, bem como pontos de acesso e roteadores Wi-Fi. De forma geral, como contramedida de prote\u00e7\u00e3o, \u00e9 suficiente utilizar HTTPS em combina\u00e7\u00e3o com a criptografia do tr\u00e1fego DNS por meio de DNS sobre TLS ou DNS sobre HTTPS. Tamb\u00e9m \u00e9 adequada a aplica\u00e7\u00e3o <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/vpn\/\"   title=\"VPN\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"162\">VPN<\/a>.     <\/p>\n<p>As quatro vulnerabilidades mais perigosas em implementa\u00e7\u00f5es de dispositivos sem fio permitem m\u00e9todos triviais para alcan\u00e7ar a inser\u00e7\u00e3o de seus quadros n\u00e3o criptografados:  <\/p>\n<ul>\n<li class=\"l\"> As vulnerabilidades CVE-2020-26140 e CVE-2020-26143 permitem a inser\u00e7\u00e3o de quadros em alguns pontos de acesso e placas sem fio em Linux, Windows e FreeBSD.\n<li class=\"l\"> A vulnerabilidade VE-2020-26145 permite o processamento de fragmentos n\u00e3o criptografados enviados como quadros completos em macOS, iOS, FreeBSD e NetBSD.\n<li class=\"l\"> A vulnerabilidade CVE-2020-26144 permite o processamento de quadros A-MSDU n\u00e3o criptografados com EtherType EAPOL em Huawei Y6, Nexus 5X, FreeBSD e LANCOM AP.   <\/ul>\n<p>Outras vulnerabilidades nas implementa\u00e7\u00f5es est\u00e3o principalmente relacionadas a problemas que ocorrem ao processar quadros fragmentados:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-26139: permite o redirecionamento de quadros com a bandeira EAPOL enviados de um remetente n\u00e3o autenticado (afeta 2\/4 pontos de acesso verificados, bem como solu\u00e7\u00f5es baseadas em NetBSD e FreeBSD).\n<li class=\"l\"> CVE-2020-26146: permite a remontagem de fragmentos criptografados sem verificar a ordem dos n\u00fameros de sequ\u00eancia.\n<li class=\"l\"> CVE-2020-26147: permite a remontagem de fragmentos mistos criptografados e n\u00e3o criptografados.\n<li class=\"l\"> CVE-2020-26142: permite o processamento de quadros fragmentados como quadros completos (afeta OpenBSD e o m\u00f3dulo sem fio ESP12-F).\n<li class=\"l\"> CVE-2020-26141: falta de verifica\u00e7\u00e3o TKIP MIC para quadros fragmentados.    <\/ul>\n<p>Problemas nas especifica\u00e7\u00f5es:  <\/p>\n<ul>\n<li class=\"l\"> CVE-2020-24588 \u2014 ataque a pacotes agregados (o sinalizador 'is aggregated' n\u00e3o est\u00e1 protegido e pode ser substitu\u00eddo por um invasor em pacotes A-MSDU no WPA, WPA2, WPA3 e WEP). Um exemplo da aplica\u00e7\u00e3o do ataque menciona o redirecionamento do usu\u00e1rio para um servidor DNS malicioso ou a burla do NAT.  <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/bf3fed5fd117b86ac96dc8f23e8cd879.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-245870 \u2014 ataque \u00e0 mistura de chaves (reconstru\u00e7\u00e3o de fragmentos criptografados usando diferentes chaves \u00e9 permitida no WPA, WPA2, WPA3 e WEP). O ataque permite determinar os dados enviados pelo cliente, por exemplo, identificar o conte\u00fado do Cookie em uma solicita\u00e7\u00e3o HTTP.  <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/e7acd01c5864ae3371f16440c3e47c2c.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>\n<li class=\"l\"> CVE-2020-24586 \u2014 ataque ao cache de fragmentos (os padr\u00f5es que abrangem WPA, WPA2, WPA3 e WEP n\u00e3o exigem a remo\u00e7\u00e3o de fragmentos j\u00e1 armazenados no cache ap\u00f3s uma nova conex\u00e3o \u00e0 rede). Permite determinar os dados enviados pelo cliente e realizar substitui\u00e7\u00f5es por dados pr\u00f3prios.    <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/ef87a0afaee47e83071d8d2a55815a2e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/ul>\n<p>Para testar a vulnerabilidade dos seus dispositivos, foi preparado um conjunto de ferramentas e uma imagem Live pronta para criar um pen drive inicializ\u00e1vel. No Linux, os problemas se manifestam na rede sem fio mac80211, em drivers sem fio espec\u00edficos e em firmwares carregados nas placas sem fio. Para corrigir as vulnerabilidades, um conjunto de patches foi proposto, abrangendo a pilha mac80211 e os drivers ath10k\/ath11k. Para alguns dispositivos, como placas sem fio Intel, \u00e9 necess\u00e1rio tamb\u00e9m instalar uma atualiza\u00e7\u00e3o de firmware.    <\/p>\n<p>Testes de dispositivos padr\u00e3o:  <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/d255c5ffdb38c2a61a8da50a889167cd.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Testes de placas sem fio no Linux e no Windows:  <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/06dd228788a85d2275ea19fd698202e0.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Testes de placas sem fio no FreeBSD e no NetBSD:  <center><img decoding=\"async\" alt=\"FragAttacks - uma s\u00e9rie de vulnerabilidades em padr\u00f5es e implementa\u00e7\u00f5es de Wi-Fi\" src=\"\/wp-content\/uploads\/2021\/05\/d3f3aa83a669cdc60710baff04493a92.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Os fabricantes foram notificados sobre os problemas h\u00e1 9 meses. Esse longo per\u00edodo de embargo \u00e9 explicado pela coordena\u00e7\u00e3o na prepara\u00e7\u00e3o de atualiza\u00e7\u00f5es e atrasos na elabora\u00e7\u00e3o de mudan\u00e7as nas especifica\u00e7\u00f5es pelas organiza\u00e7\u00f5es ICASI e Wi-Fi Alliance. Inicialmente, estava previsto divulgar as informa\u00e7\u00f5es em 9 de mar\u00e7o, mas ap\u00f3s avaliar os riscos, decidiu-se adiar a publica\u00e7\u00e3o por mais dois meses, a fim de proporcionar mais tempo para a prepara\u00e7\u00e3o dos patches, considerando a complexidade das altera\u00e7\u00f5es e as dificuldades decorrentes da pandemia de COVID-19.     <\/p>\n<p>\u00c9 not\u00e1vel que, apesar do embargo, a Microsoft eliminou prematuramente algumas vulnerabilidades na atualiza\u00e7\u00e3o de mar\u00e7o do Windows. A divulga\u00e7\u00e3o de informa\u00e7\u00f5es foi adiada em uma semana em rela\u00e7\u00e3o ao prazo originalmente previsto, e a Microsoft n\u00e3o conseguiu ou n\u00e3o quis fazer altera\u00e7\u00f5es na atualiza\u00e7\u00e3o programada pronta para publica\u00e7\u00e3o, o que criou uma amea\u00e7a para os usu\u00e1rios de outros sistemas, uma vez que os criminosos poderiam obter informa\u00e7\u00f5es sobre as vulnerabilidades por meio da engenharia reversa do conte\u00fado das atualiza\u00e7\u00f5es.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55133\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u044e\u0449\u0438\u0445 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430. \u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u044b \u043f\u043e\u0434 \u043a\u043e\u0434\u043e\u0432\u044b\u043c \u0438\u043c\u0435\u043d\u0435\u043c FragAttacks \u0438 \u043e\u0445\u0432\u0430\u0442\u044b\u0432\u0430\u044e\u0442 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0432\u0441\u0435 \u043d\u0430\u0445\u043e\u0434\u044f\u0449\u0438\u0435\u0441\u044f \u0432 \u043e\u0431\u0438\u0445\u043e\u0434\u0435 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u043f\u043b\u0430\u0442\u044b \u0438 \u0442\u043e\u0447\u043a\u0438 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 &#8212; \u0438\u0437 \u043f\u0440\u043e\u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 75 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u043a\u0430\u0436\u0434\u043e\u0435 \u0431\u044b\u043b\u043e \u043f\u043e\u0434\u0432\u0435\u0440\u0436\u0435\u043d\u043e \u043a\u0430\u043a \u043c\u0438\u043d\u0438\u043c\u0443\u043c \u043e\u0434\u043d\u043e\u043c\u0443 \u0438\u0437 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u0442\u0430\u043a\u0438. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0440\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u044b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100143,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100142","post","type-post","status-publish","format-standard","has-post-thumbnail","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=\"\u041c\u044d\u0442\u0438 \u0412\u0430\u043d\u0445\u043e\u0444\u043e\u043c (Mathy Vanhoef), \u0430\u0432\u0442\u043e\u0440 \u0430\u0442\u0430\u043a\u0438 KRACK \u043d\u0430 \u0431\u0435\u0441\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u044b\u0435 \u0441\u0435\u0442\u0438, \u0440\u0430\u0441\u043a\u0440\u044b\u043b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 12 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445, 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