{"id":54354,"date":"2019-12-24T00:00:00","date_gmt":"2019-12-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql"},"modified":"2020-02-18T14:02:21","modified_gmt":"2020-02-18T11:02:21","slug":"uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql","title":{"rendered":"Vulnerabilidade no SQLite permite ataque remoto ao Chrome via WebSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pesquisadores de seguran\u00e7a da empresa chinesa Tencent apresentaram<\/a><\/noindex> uma nova variante de vulnerabilidade Magellan<\/a><\/noindex> (CVE-2019-13734<\/a><\/noindex>), que permite a execu\u00e7\u00e3o de c\u00f3digo ao processar determinadas estruturas SQL formatadas de forma espec\u00edfica no banco de dados SQLite. Uma vulnerabilidade semelhante foi foi publicado<\/a><\/noindex> reportada pelos mesmos pesquisadores h\u00e1 um ano. A vulnerabilidade \u00e9 not\u00e1vel porque permite atacar remotamente o navegador Chrome e obter controle sobre o sistema do usu\u00e1rio ao abrir p\u00e1ginas da web controladas por criminosos. <\/p>\n

O ataque ao Chrome\/Chromium \u00e9 realizado atrav\u00e9s da API WebSQL, cujo manipulador se baseia no c\u00f3digo SQLite. O ataque a outros aplicativos s\u00f3 \u00e9 poss\u00edvel se estes permitirem a transmiss\u00e3o de estruturas SQL para o SQLite provenientes de fontes externas, como quando usam o SQLite como formato para troca de dados. O Firefox n\u00e3o \u00e9 vulner\u00e1vel, pois a empresa Mozilla se recusaram<\/a><\/noindex> n\u00e3o implementou o WebSQL em favor<\/a><\/noindex> da API IndexedDB. <\/p>\n

O Google corrigiu o problema na vers\u00e3o Chrome 79<\/a><\/noindex>. Na base de c\u00f3digo do SQLite, o problema foi foi corrigido<\/a><\/noindex> 17 de novembro, e na base de c\u00f3digo Chromium \u2014 21 de novembro<\/a><\/noindex>.
\nO problema est\u00e1 presente no c\u00f3digo<\/a><\/noindex> motor de busca de texto completo FTS3 e, por meio da manipula\u00e7\u00e3o de tabelas sombreadas (shadow tables, um tipo especial de tabela virtual com capacidade de grava\u00e7\u00e3o), pode levar \u00e0 corrup\u00e7\u00e3o do \u00edndice e \u00e0 satura\u00e7\u00e3o do buffer. Informa\u00e7\u00f5es detalhadas sobre a t\u00e9cnica de explora\u00e7\u00e3o ser\u00e3o publicadas em 90 dias.<\/p>\n

Uma nova vers\u00e3o do SQLite com a corre\u00e7\u00e3o ainda n\u00e3o foi formada<\/a><\/noindex> (\u00e9 esperado<\/a><\/noindex> 31 de dezembro). Como uma solu\u00e7\u00e3o alternativa de prote\u00e7\u00e3o, a partir do SQLite 3.26.0, pode ser usado o modo SQLITE_DBCONFIG_DEFENSIVE, que pro\u00edbe grava\u00e7\u00e3o em tabelas sombreadas e \u00e9 recomendado para ativa\u00e7\u00e3o ao processar consultas SQL externas no SQLite. Nas distribui\u00e7\u00f5es, a vulnerabilidade na biblioteca SQLite ainda permanece n\u00e3o corrigida em Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, EPEL para RHEL\/CentOS<\/a><\/noindex>, Fedora<\/a><\/noindex>, FreeBSD<\/a><\/noindex>. O Chromium j\u00e1 foi atualizado em todas as distribui\u00e7\u00f5es e n\u00e3o est\u00e1 vulner\u00e1vel, mas o problema pode afetar diversos navegadores de terceiros e aplicativos que utilizam o motor Chromium, bem como aplicativos Android baseados no Webview.<\/p>\n

Adicionalmente, no SQLite, tamb\u00e9m foram encontradas 4 problemas menos perigosos (CVE-2019-13750<\/a><\/noindex>, CVE-2019-13751<\/a><\/noindex>, CVE-2019-13752<\/a><\/noindex>, CVE-2019-13753<\/a><\/noindex>), que podem levar a vazamentos de informa\u00e7\u00f5es e contornarem restri\u00e7\u00f5es (podem ser utilizados como fatores concomitantes para um ataque ao Chrome). Os problemas indicados foram corrigidos no c\u00f3digo do SQLite em 13 de dezembro. No total, os problemas permitiram que pesquisadores preparassem um exploit funcional que permite executar c\u00f3digo no contexto do processo Chromium respons\u00e1vel pela renderiza\u00e7\u00e3o.<\/p>\n

<\/a><\/noindex><\/p>\n

Fonte: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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