{"id":80486,"date":"2020-05-06T13:42:20","date_gmt":"2020-05-06T11:42:20","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/problemy-avtonomnyh-skud-tam-otkuda-ne-zhdali"},"modified":"2020-05-06T13:42:20","modified_gmt":"2020-05-06T11:42:20","slug":"problemy-avtonomnyh-skud-tam-otkuda-ne-zhdali","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/problemy-avtonomnyh-skud-tam-otkuda-ne-zhdali","title":{"rendered":"Problemas de controle de acesso aut\u00f4nomo \u2014 De onde n\u00e3o se esperava","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Boa tarde a todos. Come\u00e7arei com a hist\u00f3ria de como me levou a realizar esta pesquisa, mas antes, avisarei: todas as a\u00e7\u00f5es pr\u00e1ticas foram realizadas com o consentimento das estruturas de gest\u00e3o. Qualquer tentativa de usar este material para invadir uma \u00e1rea restrita sem permiss\u00e3o \u00e9 um crime. <\/p>\n<p>Tudo come\u00e7ou quando, ao limpar minha mesa, acidentalmente coloquei a chave RFID da entrada no leitor NFC ACR122 \u2014 para minha surpresa, o Windows reproduziu o som de um novo dispositivo detectado e o LED acendeu em verde. At\u00e9 aquele momento, eu acreditava que essas chaves funcionavam exclusivamente no padr\u00e3o Proximity.<br \/>\n<img decoding=\"async\" alt=\"Problemas de controle de acesso aut\u00f4nomo \u2014 De onde n\u00e3o se esperava\" src=\"\/wp-content\/uploads\/2020\/05\/7f9a2b1189564d55a1eaf41837625e60.jpg\" style=\"display:block;margin: 0 auto;\" \/><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n Mas se o leitor a detectou \u2014 significa que a chave atende a um dos protocolos sobre o padr\u00e3o ISO 14443 (tamb\u00e9m conhecido como Near Field Communication, 13,56 MHz). Esqueci rapidamente da limpeza, uma vez que vi a possibilidade de me livrar do monte de chaves e guardar a chave da entrada no telefone (o apartamento j\u00e1 estava equipado com uma fechadura eletr\u00f4nica). Ao investigar, descobri que sob a pl\u00e1stica estava uma etiqueta NFC Mifare 1k \u2014 o mesmo modelo usado em crach\u00e1s de seguran\u00e7a, cart\u00f5es de transporte, etc. As tentativas de acessar o conte\u00fado dos setores inicialmente n\u00e3o tiveram sucesso, e quando finalmente consegui quebrar a chave \u2014 descobri que apenas o 3\u00ba setor \u00e9 utilizado, e nele est\u00e1 duplicado o UID do chip. Parecia muito simples, e de fato era, e n\u00e3o haveria artigo se tudo tivesse ocorrido exatamente como planejado. Assim, obtive o interior da chave, e n\u00e3o h\u00e1 problemas se for necess\u00e1rio copiar a chave para outra igual. Mas a tarefa era \u2014 transferir a chave para um dispositivo m\u00f3vel, o que comecei a fazer. Aqui come\u00e7ou a divers\u00e3o \u2014 temos um telefone \u2014 <b>iPhone SE<\/b> com <b>iOS 13.4.5 Beta build 17F5044d<\/b> e alguns componentes personalizados para o funcionamento livre do NFC \u2014 n\u00e3o me deterei nisso por raz\u00f5es objetivas. Se desejado, tudo o que se dir\u00e1 a seguir \u00e9 aplic\u00e1vel tamb\u00e9m ao sistema Android, mas com algumas simplifica\u00e7\u00f5es.<\/p>\n<p><b>Lista de tarefas a serem resolvidas:<\/b><\/p>\n<ul>\n<li><b>Obter acesso ao conte\u00fado da chave.<\/b><\/li>\n<li><b>Implementar a possibilidade de emular a chave com o dispositivo.<\/b><\/li>\n<\/ul>\n<p>\n Se a primeira parte foi relativamente simples, a segunda trouxe problemas. A primeira vers\u00e3o do emulador n\u00e3o funcionou. O problema foi rapidamente identificado \u2014 em dispositivos m\u00f3veis (tanto iOS quanto Android) no modo de emula\u00e7\u00e3o \u2014 o UID \u00e9 din\u00e2mico e n\u00e3o importa o que esteja embutido na imagem \u2014 ele muda. A segunda vers\u00e3o (executada com privil\u00e9gios de superusu\u00e1rio) fixava rigidamente o n\u00famero de s\u00e9rie escolhido \u2014 a porta abria. No entanto, eu queria fazer tudo perfeito e acabei montando uma vers\u00e3o final do emulador que podia abrir dumps Mifare e emul\u00e1-los. Impulsivo, mudei as chaves dos setores para aleat\u00f3rias e tentei abrir a porta. E ela... <i>ABRIU! <\/i> Depois de um tempo, percebi que est\u00e3o abertas <i>qualquer<\/i> porta com essa fechadura, at\u00e9 mesmo aquelas para as quais a chave original n\u00e3o servia. Em vista disso, formulei uma nova lista de tarefas a serem realizadas:<\/p>\n<ul>\n<li><b>Descobrir qual controlador \u00e9 respons\u00e1vel pelo trabalho com as chaves<\/b> <\/li>\n<li><b>Entender se h\u00e1 conex\u00e3o com a rede e uma base de dados geral<\/b> <\/li>\n<li><b>Descobrir por que uma chave que \u00e9 basicamente ileg\u00edvel se torna universal<\/b> <\/li>\n<\/ul>\n<p>\nAp\u00f3s conversar com o engenheiro da empresa de gest\u00e3o, descobri que s\u00e3o utilizados controladores simples Iron Logic z5r sem conex\u00e3o com uma rede externa.<\/p>\n<p>                        <b class=\"spoiler_title\">Leitor CP-Z2 MF e controlador IronLogic z5r<\/b><br \/>\n                         Me foi fornecido um conjunto de equipamentos para testes:<\/p>\n<p><img decoding=\"async\" alt=\"Problemas de controle de acesso aut\u00f4nomo \u2014 De onde n\u00e3o se esperava\" src=\"\/wp-content\/uploads\/2020\/05\/24229d027cb7c55ec8aa20eb269ac7e6.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nComo se percebe, o sistema \u00e9 totalmente aut\u00f4nomo e extremamente primitivo. A princ\u00edpio, pensei que o controlador estivesse em modo de aprendizado \u2014 a ideia \u00e9 que ele l\u00ea a chave, a armazena na mem\u00f3ria e abre a porta \u2014 esse modo \u00e9 usado quando \u00e9 necess\u00e1rio gravar todas as chaves, por exemplo, ao trocar a fechadura em um pr\u00e9dio de apartamentos. Mas essa teoria n\u00e3o se confirmou \u2014 por software, esse modo est\u00e1 desativado, o jumper est\u00e1 em posi\u00e7\u00e3o de trabalho \u2014 e mesmo assim, ao aproximar o dispositivo, vemos o seguinte:<\/p>\n<p>                        <b class=\"spoiler_title\">Captura de tela do processo de emula\u00e7\u00e3o no dispositivo<\/b><br \/>\n                        <img decoding=\"async\" alt=\"Problemas de controle de acesso aut\u00f4nomo \u2014 De onde n\u00e3o se esperava\" src=\"\/wp-content\/uploads\/2020\/05\/ba774fc83aafde90d0ce680717cdbd9b.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n... e o controlador sinaliza que o acesso foi concedido.<\/p>\n<p>Ent\u00e3o, o problema reside no software do controlador ou do leitor. Vamos verificar o leitor \u2014 ele funciona em modo iButton, ent\u00e3o conectaremos a placa de seguran\u00e7a Bolid \u2014 teremos a oportunidade de observar os dados de sa\u00edda do leitor.<\/p>\n<p>                        <b class=\"spoiler_title\">A placa ser\u00e1 conectada mais tarde via RS232<\/b><br \/>\n                        <img decoding=\"async\" alt=\"Problemas de controle de acesso aut\u00f4nomo \u2014 De onde n\u00e3o se esperava\" src=\"\/wp-content\/uploads\/2020\/05\/2960cec6f70f0abd98557a28e54eca6f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p>\nAtrav\u00e9s de m\u00faltiplos testes, descobrimos que o leitor transmite o mesmo c\u00f3digo em caso de falha de autentica\u00e7\u00e3o: 1219191919<\/p>\n<p>A situa\u00e7\u00e3o come\u00e7a a esclarecer-se, no entanto, neste momento, n\u00e3o entendo por que o controlador responde positivamente a esse c\u00f3digo. Suspeito que, ao preencher a base, accidentalmente ou intencionalmente, apresentaram um cart\u00e3o com outras chaves de setor, e o leitor enviou esse c\u00f3digo e o controlador o salvou. Infelizmente, n\u00e3o tenho um programador original da IronLogic para verificar a base de chaves do controlador, mas espero ter conseguido destacar que o problema existe. Uma demonstra\u00e7\u00e3o em v\u00eddeo desse vazamento est\u00e1 dispon\u00edvel. <noindex><a rel=\"nofollow\" href=\"https:\/\/vk.com\/video104139075_456239166\">no link<\/a><\/noindex>.<\/p>\n<p>P.S. A teoria da adi\u00e7\u00e3o acidental \u00e9 contrariada pelo fato de que em um centro empresarial em Krasnoyarsk consegui abrir a porta usando o mesmo m\u00e9todo.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/500396\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0441\u0435\u043c \u0434\u043e\u0431\u0440\u043e\u0433\u043e \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0441\u0443\u0442\u043e\u043a. \u041d\u0430\u0447\u043d\u0443 \u0441 \u043f\u0440\u0435\u0434\u044b\u0441\u0442\u043e\u0440\u0438\u0438, \u043e \u0442\u043e\u043c, \u0447\u0442\u043e \u043c\u0435\u043d\u044f \u043f\u043e\u0431\u0443\u0434\u0438\u043b\u043e \u043f\u0440\u043e\u0432\u0435\u0441\u0442\u0438 \u0434\u0430\u043d\u043d\u043e\u0435 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u043d\u0438\u0435, \u043d\u043e \u043f\u0440\u0435\u0436\u0434\u0435 \u043f\u0440\u0435\u0434\u0443\u043f\u0440\u0435\u0436\u0443: \u0432\u0441\u0435 \u043f\u0440\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044f \u0431\u044b\u043b\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u044b \u0441 \u0441\u043e\u0433\u043b\u0430\u0441\u0438\u044f \u0443\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440. \u041b\u044e\u0431\u0430\u044f \u043f\u043e\u043f\u044b\u0442\u043a\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0432 \u0446\u0435\u043b\u044f\u0445 \u043f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f \u043d\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u0443\u044e \u0442\u0435\u0440\u0440\u0438\u0442\u043e\u0440\u0438\u044e \u0431\u0435\u0437 \u043f\u0440\u0430\u0432\u0430 \u0442\u0430\u043c \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u2014 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0443\u0433\u043e\u043b\u043e\u0432\u043d\u044b\u043c \u043f\u0440\u0430\u0432\u043e\u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u0435\u043c. \u041d\u0430\u0447\u0430\u043b\u043e\u0441\u044c \u0432\u0441\u0435 \u0441 \u0442\u043e\u0433\u043e, \u0447\u0442\u043e \u0443\u0431\u0438\u0440\u0430\u044f\u0441\u044c \u043d\u0430 \u0441\u0442\u043e\u043b\u0435, \u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":80487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-80486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - 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