{"id":460,"date":"2024-04-05T08:01:12","date_gmt":"2024-04-05T05:01:12","guid":{"rendered":"https:\/\/sms-txt.net\/?p=460"},"modified":"2024-09-05T12:46:28","modified_gmt":"2024-09-05T09:46:28","slug":"interceptacao-invisivel-de-mensagens-curtas-ataque-ss7","status":"publish","type":"post","link":"https:\/\/sms-txt.net\/pt\/interceptacao-de-sms\/interceptacao-invisivel-de-mensagens-curtas-ataque-ss7\/","title":{"rendered":"Intercepta\u00e7\u00e3o invis\u00edvel de mensagens curtas - ataque SS7"},"content":{"rendered":"<p>Intercepta\u00e7\u00e3o invis\u00edvel de mensagens curtas<\/p>\n<p>No entanto, muitos servi\u00e7os utilizam o SMS como uma esta\u00e7\u00e3o. Por exemplo, as institui\u00e7\u00f5es banc\u00e1rias utilizam o SMS para obter remessas e envios de OTP (One Time Password), redes sociais - como recupera\u00e7\u00e3o de senhas e mensageiros - para obter acesso ao aplicativo. O ataque destr\u00f3i o fato de um assinante estar \u00e0 deriva em uma rede social. At\u00e9 mesmo o HLR compreende uma listagem da nova localiza\u00e7\u00e3o desse assinante, na qual foram enviadas chamadas telef\u00f4nicas e mensagens SMS. Caso haja uma previs\u00e3o, o esfor\u00e7o falha, mesmo que a rede registre o assinante diretamente de volta em sua pr\u00f3pria rede dom\u00e9stica. O invasor descobre que pode replicar o ataque para fazer com que o esfor\u00e7o de chamada seja negligenciado. Caso os invasores controlem a se\u00e7\u00e3o da rede, que ser\u00e1 sinalizada para obter um MSC, eles poder\u00e3o interceptar mensagens SMS de encerramento e tamb\u00e9m desviar chamadas telef\u00f4nicas de voz ass\u00edncronas.<\/p>\n<p>&nbsp;<\/p>\n<p>Depois que o registro \u00e9 conclu\u00eddo, todos os SMSs s\u00e3o enviados para a se\u00e7\u00e3o de rede sinalizada como MSC e VLR a partir do conceito de sinaliza\u00e7\u00e3o UpdateLocation.<\/p>\n<h2>O assinante atacado pode retornar \u00e0 rede dom\u00e9stica assim que um dos seguintes eventos for acionado:<\/h2>\n<ul>\n<li>Chamada efetuada;<\/li>\n<li>SMS de sa\u00edda;<\/li>\n<li>Mudan\u00e7a para a \u00e1rea coberta por outro switch m\u00f3vel;<\/li>\n<li>Reinicializa\u00e7\u00e3o do telefone celular.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Do ponto de vista do invasor, manter o assinante inscrito na rede \"falsa\" n\u00e3o \u00e9 confi\u00e1vel, pois n\u00e3o \u00e9 poss\u00edvel prever todas as atividades do assinante.<\/p>\n<p>&nbsp;<\/p>\n<p>O ataque faz com que um assinante inscrito em uma rede separada, portanto, seu MSC\/VLR atual pode ser \u00fatil para chamadas telef\u00f4nicas de voz e tamb\u00e9m para originar mensagens SMS, e tamb\u00e9m um MSC falso pode ser utilizado para receber mensagens SMS de termina\u00e7\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<p>Os invasores podem usar isso para atacar servi\u00e7os de diferentes programas (como, por exemplo, contas de institui\u00e7\u00f5es financeiras) que utilizam SMS para que uma esta\u00e7\u00e3o veja os clientes de alguns turnos. Caso o invasor controle a se\u00e7\u00e3o da rede, que ser\u00e1 sinalizada como um novo MSC, ele poder\u00e1 interceptar mensagens SMS de encerramento entregues com servi\u00e7os como banco m\u00f3vel, recupera\u00e7\u00e3o de senha para servi\u00e7os da Web, acesso a c\u00f3digos de acessibilidade como mensageiros etc. Todas essas manipula\u00e7\u00f5es tendem a n\u00e3o evitar que o assinante atacado crie chamadas telef\u00f4nicas emergentes e entregue SMSs, mas os SMSs v\u00e3o para o endere\u00e7o do MSC.<\/p>\n<p>&nbsp;<\/p>\n<p>Al\u00e9m disso, essa vulnerabilidade tamb\u00e9m \u00e9 bem compreendida, e a maioria dos provedores de firewall SS7 se esfor\u00e7a para impedir o registro em redes \"falsas\". Geralmente, o mecanismo de um firewall SS7 \u00e9 baseado em seu banco de dados que cont\u00e9m as localiza\u00e7\u00f5es dos assinantes existentes. Al\u00e9m disso, um firewall SS7 precisa ter uma tabela de velocidade que represente um per\u00edodo para atingir praticamente qualquer na\u00e7\u00e3o. A velocidade entre duas redes alem\u00e3s \u00e9 zero; a velocidade entre Madagascar e a Alemanha ser\u00e1 ainda 8, que \u00e9 a dura\u00e7\u00e3o de uma viagem, etc.<\/p>\n<p>&nbsp;<\/p>\n<p>Depois que uma comunica\u00e7\u00e3o UpdateLocation \u00e9 obtida da rede, o firewall SS7 extrai as informa\u00e7\u00f5es como resultado do identificador IMSI do assinante, bem como do endere\u00e7o de algum VLR\", prefixo que provavelmente ser\u00e1 empregado em breve para encontrar o valor da tarifa.<\/p>\n<p>&nbsp;<\/p>\n<p>Em seguida, o firewall SS7 procura ativamente a localiza\u00e7\u00e3o do assinante no banco de dados. At\u00e9 mesmo o firewall SS7 carrega o prefixo do VLR e o utiliza como segredo para especificar exatamente o pre\u00e7o da velocidade; tamb\u00e9m calcula o per\u00edodo de registro e a transfer\u00eancia de per\u00edodo entre o momento atual. Se o tempo de transfer\u00eancia for menor do que o valor da velocidade, o material do UpdateLocation ser\u00e1 considerado agressivo e dever\u00e1 ser obstru\u00eddo. A comunica\u00e7\u00e3o do UpdateLocation deve ser realmente permitida.<\/p>\n<p>&nbsp;<\/p>\n<p>Como forma de ignorar esse mecanismo de prote\u00e7\u00e3o, o malfeitor pode registrar o assinante dentro da rede \"falsa\". Portanto, a aten\u00e7\u00e3o desse endere\u00e7o VLR talvez n\u00e3o seja suficiente para decidir se os visitantes-alvo do site devem ser obstru\u00eddos. O registro junto com os endere\u00e7os MSC e VLR \u00e9 muito mais confi\u00e1vel para o intruso e tamb\u00e9m ajuda a contornar alguns firewalls SS7 com regras.<\/p>\n<p>&nbsp;<\/p>\n<p>Como podemos ver facilmente, v\u00e1rios firewalls SS7 n\u00e3o s\u00e3o programas de seguran\u00e7a confi\u00e1veis, embora o fato de a marca registrada do ataque ser f\u00e1cil.<\/p>","protected":false},"excerpt":{"rendered":"<p>Intercepta\u00e7\u00e3o invis\u00edvel de mensagens curtas Muitos servi\u00e7os, entretanto, utilizam o SMS como uma esta\u00e7\u00e3o. Por exemplo, as institui\u00e7\u00f5es banc\u00e1rias utilizam o SMS para obter envio e envio de OTP (One Time Password), redes sociais - como recupera\u00e7\u00e3o de senhas e mensageiros - para obter acesso ao aplicativo. O ataque destr\u00f3i o fato de um assinante estar \u00e0 deriva em uma rede social....<\/p>","protected":false},"author":1,"featured_media":1738,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68,70,69,1],"tags":[],"class_list":["post-460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-call-interception","category-location-tracking","category-sms-intercept","category-ss7-sms"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.7 (Yoast SEO v26.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Invisible Interception of Short Messages - SS7 attack<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sms-txt.net\/pt\/interceptacao-de-sms\/interceptacao-invisivel-de-mensagens-curtas-ataque-ss7\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Invisible Interception of Short Messages - SS7 attack\" \/>\n<meta property=\"og:description\" content=\"Invisible Interception of Short Messages Lots of services however utilize SMS like a station. By way of instance, banking institutions utilize SMS to get OTP (One Time Password) shipping and shipping, societal networks&#8211;such as password retrieval, messengers&#8211;to get access to the applying. 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