{"id":71652,"date":"2020-02-27T08:51:34","date_gmt":"2020-02-27T05:51:34","guid":{"rendered":"https:\/\/prohoster.info\/blog\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8"},"modified":"2020-03-03T16:10:40","modified_gmt":"2020-03-03T13:10:40","slug":"0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"vulnerabilidade de 0-day no Chrome, descoberta atrav\u00e9s da an\u00e1lise de altera\u00e7\u00f5es no motor V8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pesquisadores da empresa Exodus Intelligence foi demonstrado<\/a><\/noindex> identificaram uma vulnerabilidade no processo de corre\u00e7\u00e3o de falhas na base de c\u00f3digo do Chrome\/Chromium. O problema est\u00e1 relacionado ao fato de que o Google divulga informa\u00e7\u00f5es de que as corre\u00e7\u00f5es implementadas est\u00e3o relacionadas a problemas de seguran\u00e7a somente ap\u00f3s o lan\u00e7amento, mas
\nadiciona ao reposit\u00f3rio o c\u00f3digo para corrigir a vulnerabilidade no motor V8 antes da publica\u00e7\u00e3o do lan\u00e7amento. Por um tempo, as corre\u00e7\u00f5es passam por testes e h\u00e1 uma janela durante a qual a vulnerabilidade \u00e9 corrigida na base de c\u00f3digo e dispon\u00edvel para an\u00e1lise, mas a vulnerabilidade permanece sem corre\u00e7\u00e3o nos sistemas dos usu\u00e1rios. <\/p>\n

Ao analisar as altera\u00e7\u00f5es feitas no reposit\u00f3rio, os pesquisadores notaram a adi\u00e7\u00e3o feita em 19 de fevereiro a corre\u00e7\u00e3o<\/a><\/noindex> e, em tr\u00eas dias, conseguiram preparar exploit<\/a><\/noindex>, um exploit que ataca as vers\u00f5es atuais do Chrome (o exploit publicado n\u00e3o inclu\u00eda componentes para contornar a prote\u00e7\u00e3o de sandbox). A empresa Google rapidamente lan\u00e7ou<\/a><\/noindex> lan\u00e7ou a atualiza\u00e7\u00e3o do Chrome 80.0.3987.122, corrigindo a vulnerabilidade relacionada ao exploit proposto uma vulnerabilidade<\/a><\/noindex> (CVE-2020-6418). A vulnerabilidade foi inicialmente detectada pelos engenheiros do Google e foi causada por um problema no manuseio de tipos na opera\u00e7\u00e3o JSCreate, que pode ser explorado atrav\u00e9s do m\u00e9todo Array.pop ou Array.prototype.pop. \u00c9 not\u00e1vel que um problema semelhante foi foi corrigido<\/a><\/noindex> encontrado no Firefox no ver\u00e3o passado.<\/p>\n

Os pesquisadores tamb\u00e9m notaram a simplifica\u00e7\u00e3o na cria\u00e7\u00e3o de exploits devido \u00e0 inclus\u00e3o no Chrome 80<\/a><\/noindex> mecanismo de empacotamento de ponteiros<\/a><\/noindex> (em vez de armazenar o valor completo de 64 bits, apenas os bits inferiores \u00fanicos do ponteiro s\u00e3o mantidos, o que permite reduzir significativamente o consumo de mem\u00f3ria na heap). Por exemplo, algumas estruturas de dados localizadas no in\u00edcio da heap, como a tabela de fun\u00e7\u00f5es embutidas, objetos «contexto nativo» e objetos raiz<\/a><\/noindex> do coletor de lixo agora est\u00e3o alocadas em endere\u00e7os empacotados previs\u00edveis e acess\u00edveis para grava\u00e7\u00e3o.<\/p>\n

Curiosamente, quase um ano atr\u00e1s, a Exodus Intelligence fez<\/a><\/noindex> uma demonstra\u00e7\u00e3o semelhante da possibilidade de criar um exploit com base no estudo do log p\u00fablico de corre\u00e7\u00f5es no V8, mas, aparentemente, n\u00e3o houve as devidas consequ\u00eancias. No lugar dos pesquisadores,
\npoderiam estar criminosos ou ag\u00eancias de seguran\u00e7a, que ao criar um exploit teriam a oportunidade de explorar a vulnerabilidade ocultamente por dias ou at\u00e9 semanas antes da forma\u00e7\u00e3o de um novo lan\u00e7amento do Chrome. <\/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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