{"id":102321,"date":"2021-11-18T21:36:40","date_gmt":"2021-11-18T19:36:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere"},"modified":"2021-11-18T21:36:40","modified_gmt":"2021-11-18T19:36:41","slug":"predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","title":{"rendered":"M\u00e9todo de ataque proposto para a determina\u00e7\u00e3o remota de fragmentos de mem\u00f3ria no servidor","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Um grupo de pesquisadores da Universidade T\u00e9cnica de Graz (\u00c1ustria), anteriormente conhecido pelo desenvolvimento de ataques como MDS, NetSpectre, Throwhammer e ZombieLoad, publicou um novo m\u00e9todo de ataque (CVE-2021-3714) por meio de canais laterais no mecanismo de deduplica\u00e7\u00e3o de p\u00e1ginas de mem\u00f3ria (Memory-Deduplication), permitindo determinar a presen\u00e7a de certos dados na mem\u00f3ria, organizar um vazamento de conte\u00fado da mem\u00f3ria byte a byte ou determinar o layout da mem\u00f3ria para contornar a prote\u00e7\u00e3o baseada em randomiza\u00e7\u00e3o de endere\u00e7os (ASLR). O novo m\u00e9todo se diferencia dos ataques anteriormente demonstrados sobre o mecanismo de deduplica\u00e7\u00e3o por realizar o ataque a partir de um host externo, utilizando como crit\u00e9rio a varia\u00e7\u00e3o nos tempos de resposta das solicita\u00e7\u00f5es enviadas pelo atacante atrav\u00e9s dos protocolos HTTP\/1 e HTTP\/2. A possibilidade de realizar o ataque foi demonstrada em servidores baseados em Linux e Windows.      <\/p>\n<p>Os ataques ao mecanismo de deduplica\u00e7\u00e3o de mem\u00f3ria usam como canal para o vazamento de informa\u00e7\u00f5es a diferen\u00e7a no tempo de processamento da opera\u00e7\u00e3o de grava\u00e7\u00e3o em situa\u00e7\u00f5es em que a modifica\u00e7\u00e3o de dados leva \u00e0 clonagem de uma p\u00e1gina de mem\u00f3ria deduplicada atrav\u00e9s do mecanismo Copy-On-Write (COW). Durante a opera\u00e7\u00e3o, o kernel identifica p\u00e1ginas de mem\u00f3ria iguais de processos diferentes e as combina, exibindo p\u00e1ginas de mem\u00f3ria id\u00eanticas em uma \u00fanica \u00e1rea de mem\u00f3ria f\u00edsica para armazenar apenas uma c\u00f3pia. Quando um dos processos tenta modificar dados relacionados \u00e0s p\u00e1ginas deduplicadas, ocorre uma exce\u00e7\u00e3o (page fault) e, por meio do mecanismo Copy-On-Write, automaticamente \u00e9 criada uma c\u00f3pia separada da p\u00e1gina de mem\u00f3ria, que \u00e9 alocada ao processo. O tempo adicional gasto na execu\u00e7\u00e3o da c\u00f3pia pode ser um sinal de modifica\u00e7\u00e3o dos dados que se sobrep\u00f5em a outro processo.      <\/p>\n<p>Os pesquisadores mostraram que os atrasos resultantes do funcionamento do mecanismo COW podem ser detectados n\u00e3o apenas localmente, mas tamb\u00e9m analisando a varia\u00e7\u00e3o no tempo de entrega das respostas pela rede. Foram propostos v\u00e1rios m\u00e9todos para determinar o conte\u00fado da mem\u00f3ria a partir de um host remoto atrav\u00e9s da an\u00e1lise do tempo de execu\u00e7\u00e3o das solicita\u00e7\u00f5es pelos protocolos HTTP\/1 e HTTP\/2. Para preservar os padr\u00f5es a serem analisados, s\u00e3o utilizados aplicativos web t\u00edpicos, que mant\u00eam em mem\u00f3ria as informa\u00e7\u00f5es recebidas nas solicita\u00e7\u00f5es.       <\/p>\n<p>O princ\u00edpio geral do ataque se resume a preencher na <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/dts-newyork\/\"   title=\"servidor\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2687\">servidor<\/a> p\u00e1ginas de mem\u00f3ria com dados que podem repetir o conte\u00fado j\u00e1 existente na p\u00e1gina de mem\u00f3ria do servidor. Em seguida, o atacante espera o tempo necess\u00e1rio para que o n\u00facleo execute a deduplica\u00e7\u00e3o e a fus\u00e3o da p\u00e1gina de mem\u00f3ria, ap\u00f3s o que ele altera um duplicado de dados sob controle e avalia o tempo de resposta para determinar o sucesso do ataque.        <center><img decoding=\"async\" alt=\"M\u00e9todo de ataque proposto para a determina\u00e7\u00e3o remota de fragmentos de mem\u00f3ria no servidor\" src=\"\/wp-content\/uploads\/2021\/11\/bc8908cb0105a0b745b05424ec66756e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Nos experimentos realizados, a velocidade m\u00e1xima de vazamento de informa\u00e7\u00f5es foi de 34.41 bytes por hora em um ataque pela rede global e 302.16 bytes por hora em um ataque pela rede local, mais r\u00e1pido que outros m\u00e9todos de extra\u00e7\u00e3o de dados por canais externos (por exemplo, em um ataque NetSpectre, a velocidade de transmiss\u00e3o de dados \u00e9 de 7.5 bytes por hora).          <\/p>\n<p>Tr\u00eas op\u00e7\u00f5es de ataque foram propostas. A primeira op\u00e7\u00e3o permite identificar dados na mem\u00f3ria <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/pt\/server\/\"   title=\"servidor web\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"762\">servidor web<\/a>, na qual o Memcached \u00e9 utilizado. O ataque consiste em carregar conjuntos espec\u00edficos de dados no armazenamento Memcached, limpar um bloco deduplicado, reescrever o mesmo elemento e criar condi\u00e7\u00f5es para a ocorr\u00eancia de c\u00f3pia COW atrav\u00e9s da modifica\u00e7\u00e3o do conte\u00fado do bloco. Durante o experimento com o Memcached, foi poss\u00edvel identificar a vers\u00e3o do libc instalada no sistema em execu\u00e7\u00e3o em uma m\u00e1quina virtual em 166.51 segundos.    <\/p>\n<p>A segunda op\u00e7\u00e3o permitiu descobrir o conte\u00fado de registros no SGBD MariaDB, utilizando o armazenamento InnoDB, recriando o conte\u00fado byte a byte. O ataque \u00e9 realizado enviando solicita\u00e7\u00f5es especialmente modificadas que levam a discrep\u00e2ncias de um byte nas p\u00e1ginas de mem\u00f3ria e analisando o tempo de resposta para determinar se a suposi\u00e7\u00e3o sobre o conte\u00fado do byte estava correta. A taxa de vazamento desse m\u00e9todo \u00e9 baixa, de 1.5 bytes por hora em ataques a partir da rede local. A vantagem do m\u00e9todo \u00e9 que ele pode ser usado para recuperar conte\u00fado desconhecido da mem\u00f3ria.    <\/p>\n<p>A terceira op\u00e7\u00e3o permitiu contornar completamente o mecanismo de prote\u00e7\u00e3o KASLR em 4 minutos e obter informa\u00e7\u00f5es sobre o deslocamento na mem\u00f3ria da imagem do n\u00facleo da m\u00e1quina virtual, em uma situa\u00e7\u00e3o onde o endere\u00e7o de deslocamento est\u00e1 em uma p\u00e1gina de mem\u00f3ria cujos outros dados n\u00e3o s\u00e3o alterados. O ataque foi realizado a partir de um host que estava a 14 saltos (hops) do sistema atacado. Exemplos de c\u00f3digo para realizar os ataques apresentados prometem ser publicados no GitHub.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56179\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0430\u0442\u0430\u043a MDS, NetSpectre, Throwhammer \u0438 ZombieLoad, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u043d\u043e\u0432\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 (CVE-2021-3714) \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c \u043d\u0430 \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0434\u0435\u0434\u0443\u043f\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u043f\u0430\u043c\u044f\u0442\u0438 (Memory-Deduplication), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0438\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0432 \u043f\u0430\u043c\u044f\u0442\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445, \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u0431\u0430\u0439\u0442\u043e\u0432\u0443\u044e \u0443\u0442\u0435\u0447\u043a\u0443 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043f\u0430\u043c\u044f\u0442\u0438 \u0438\u043b\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0440\u0430\u0441\u043a\u043b\u0430\u0434\u043a\u0443 \u043f\u0430\u043c\u044f\u0442\u0438 \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u0437\u0430\u0449\u0438\u0442\u044b \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0440\u0430\u043d\u0434\u043e\u043c\u0438\u0437\u0430\u0446\u0438\u0438 \u0430\u0434\u0440\u0435\u0441\u043e\u0432 (ASLR). \u041e\u0442 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":102322,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-102321","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=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f 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anteriormente conhecido por desenvolver os ataques MDS, NetSpectre, Throwhammer e ZombieLoad, publicou um novo m\u00e9todo de ataque (CVE-2021-3714) por canais secund\u00e1rios.","canonical_url":"https:\/\/prohoster.info\/pt\/blog\/news\/predlozhen-metod-ataki-dlya-udalyonnogo-opredeleniya-fragmentov-pamyati-na-servere","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pt_PT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043c\u0435\u0442\u043e\u0434 \u0430\u0442\u0430\u043a\u0438 \u0434\u043b\u044f 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