{"id":103200,"date":"2022-02-06T03:36:58","date_gmt":"2022-02-06T01:37:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupen-kasper-skaner-problem-so-spekulyativnym-vypolneniem-koda-v-yadre-linux"},"modified":"2022-02-06T03:36:58","modified_gmt":"2022-02-06T01:37:00","slug":"dostupen-kasper-skaner-problem-so-spekulyativnym-vypolneniem-koda-v-yadre-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/dostupen-kasper-skaner-problem-so-spekulyativnym-vypolneniem-koda-v-yadre-linux","title":{"rendered":"O Kasper, um scanner de problemas de execu\u00e7\u00e3o especulativa de c\u00f3digo no n\u00facleo do Linux, est\u00e1 dispon\u00edvel.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Um grupo de pesquisadores da Universidade Livre de Amsterd\u00e3 publicou o kit de ferramentas Kasper, destinado a identificar no n\u00facleo do Linux fragmentos de c\u00f3digo que podem ser usados para explorar vulnerabilidades do tipo Spectre, causadas pela execu\u00e7\u00e3o especulativa de c\u00f3digo pelo processador. Os c\u00f3digos-fonte do kit de ferramentas s\u00e3o distribu\u00eddos sob a licen\u00e7a Apache 2.0.    <\/p>\n<p>Lembramos que para realizar ataques como o Spectre v1, que permitem determinar o conte\u00fado da mem\u00f3ria, \u00e9 necess\u00e1ria a presen\u00e7a em c\u00f3digo privilegiado de uma sequ\u00eancia espec\u00edfica de instru\u00e7\u00f5es (gadgets), que leva \u00e0 execu\u00e7\u00e3o especulativa de instru\u00e7\u00f5es. Para otimiza\u00e7\u00e3o, o processador come\u00e7a a executar esses gadgets em modo especulativo, depois determina que a previs\u00e3o de bifurca\u00e7\u00e3o n\u00e3o se concretizou e reverte as opera\u00e7\u00f5es ao estado original, mas os dados processados durante a execu\u00e7\u00e3o especulativa permanecem no cache e nos buffers microarquiteturais e est\u00e3o dispon\u00edveis para extra\u00e7\u00e3o por meio de v\u00e1rios m\u00e9todos de determina\u00e7\u00e3o de dados remanescentes por canais laterais.       <\/p>\n<p>Ferramentas anteriormente dispon\u00edveis para escanear gadgets para a vulnerabilidade Spectre, baseadas na busca de padr\u00f5es t\u00edpicos, mostravam um alto n\u00edvel de falsos positivos, enquanto deixavam passar muitos gadgets reais (experimentos mostraram que 99% dos gadgets identificados por essas ferramentas n\u00e3o podiam ser usados para ataques, e 33% dos gadgets funcionais, capazes de levar a um ataque, n\u00e3o foram detectados).     <\/p>\n<p>Para melhorar a precis\u00e3o na identifica\u00e7\u00e3o de dispositivos problem\u00e1ticos, a Kasper modela vulnerabilidades que um atacante pode explorar em cada etapa de ataques do tipo Spectre \u2014 s\u00e3o modelados problemas que permitem o controle de dados (por exemplo, a inser\u00e7\u00e3o de dados do atacante em estruturas microarquiteturais para influenciar a execu\u00e7\u00e3o especulativa subsequente por meio de ataques do tipo LVI), acessar informa\u00e7\u00f5es confidenciais (por exemplo, quando o acesso ultrapassa os limites do buffer ou usa a mem\u00f3ria ap\u00f3s sua libera\u00e7\u00e3o) e organizar o vazamento de informa\u00e7\u00f5es confidenciais (por exemplo, analisando o estado do cache do processador ou utilizando o m\u00e9todo MDS).        <center><img decoding=\"async\" alt=\"O Kasper, um scanner de problemas de execu\u00e7\u00e3o especulativa de c\u00f3digo no n\u00facleo do Linux, est\u00e1 dispon\u00edvel.\" src=\"\/wp-content\/uploads\/2022\/02\/3a6cbda67cad6223d91f3ba63d4c1477.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Durante os testes, o n\u00facleo se conecta \u00e0s bibliotecas de tempo de execu\u00e7\u00e3o do Kasper e \u00e0s verifica\u00e7\u00f5es que operam no n\u00edvel do LLVM. No processo de verifica\u00e7\u00e3o, realiza-se a emula\u00e7\u00e3o da execu\u00e7\u00e3o especulativa de c\u00f3digo, implementada por meio do mecanismo de checkpoint-restore, que executa especificamente o ramo de c\u00f3digo incorretamente previsto, e ap\u00f3s isso, reverte ao estado inicial antes da ramifica\u00e7\u00e3o. O Kasper tamb\u00e9m tenta modelar v\u00e1rias vulnerabilidades de software e hardware, analisa os impactos de efeitos arquiteturais e microarquiteturais, e realiza testes de fuzzing para avaliar poss\u00edveis a\u00e7\u00f5es de um atacante. Para analisar fluxos de execu\u00e7\u00e3o, \u00e9 utilizado o port DataFlowSanitizer para o n\u00facleo Linux, e para os testes de fuzzing, uma vers\u00e3o modificada do pacote syzkaller.      <center><img decoding=\"async\" alt=\"O Kasper, um scanner de problemas de execu\u00e7\u00e3o especulativa de c\u00f3digo no n\u00facleo do Linux, est\u00e1 dispon\u00edvel.\" src=\"\/wp-content\/uploads\/2022\/02\/7717c28239ef47fa49b36c3088759185.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/center>  <\/p>\n<p>Durante a digitaliza\u00e7\u00e3o do n\u00facleo Linux com o aux\u00edlio do Kasper, foram identificados 1379 gadgets desconhecidos anteriormente, que potencialmente podem levar a vazamentos de dados durante a execu\u00e7\u00e3o especulativa de instru\u00e7\u00f5es. Observa-se que apenas uma parte deles pode representar problemas reais, mas para demonstrar que h\u00e1 um perigo real e n\u00e3o apenas te\u00f3rico, foi desenvolvido um prot\u00f3tipo funcional do exploit para um dos trechos problem\u00e1ticos do c\u00f3digo, resultando em vazamentos de informa\u00e7\u00f5es da mem\u00f3ria do n\u00facleo.<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=56642\">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 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0430 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439 Kasper, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f \u0432 \u044f\u0434\u0440\u0435 Linux \u043e\u0442\u0440\u044b\u0432\u043a\u043e\u0432 \u043a\u043e\u0434\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0434\u043b\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u043a\u043b\u0430\u0441\u0441\u0430 Spectre, \u0432\u044b\u0437\u0432\u0430\u043d\u043d\u044b\u0445 \u0441\u043f\u0435\u043a\u0443\u043b\u044f\u0442\u0438\u0432\u043d\u044b\u043c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435\u043c \u043a\u043e\u0434\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u043c. \u0418\u0441\u0445\u043e\u0434\u043d\u044b\u0435 \u0442\u0435\u043a\u0441\u0442\u044b \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u044f \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 Apache 2.0. \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, \u0447\u0442\u043e \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u0442\u0430\u043a\u0438\u0445 \u0430\u0442\u0430\u043a, \u043a\u0430\u043a Spectre v1, \u0434\u0430\u044e\u0449\u0438\u0445 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u043f\u0430\u043c\u044f\u0442\u0438, \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u043d\u0430\u043b\u0438\u0447\u0438\u0435 \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":103201,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-103200","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 \u0410\u043c\u0441\u0442\u0435\u0440\u0434\u0430\u043c\u0441\u043a\u043e\u0433\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 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