{"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\/es\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"Vulnerabilidad de d\u00eda cero en Chrome, detectada a trav\u00e9s del an\u00e1lisis de cambios en el motor V8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Los investigadores de Exodus Intelligence <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/2020\/02\/24\/a-eulogy-for-patch-gapping\/\">demostraron<\/a><\/noindex> han identificado un punto d\u00e9bil en el proceso de correcci\u00f3n de vulnerabilidades en la base de c\u00f3digo de Chrome\/Chromium. El problema radica en que Google revela informaci\u00f3n sobre las correcciones relacionadas con problemas de seguridad solo despu\u00e9s del lanzamiento, pero<br \/>\nagrega al repositorio c\u00f3digo para solucionar la vulnerabilidad en el motor V8 antes de la publicaci\u00f3n del lanzamiento. Durante alg\u00fan tiempo, las correcciones se someten a pruebas, creando un per\u00edodo en el que la vulnerabilidad es corregida en la base de c\u00f3digo y est\u00e1 disponible para su an\u00e1lisis, pero la vulnerabilidad permanece sin corregir en los sistemas de los usuarios. <\/p>\n<p>Al estudiar los cambios realizados en el repositorio, los investigadores notaron la adici\u00f3n del 19 de febrero <noindex><a rel=\"nofollow\" href=\"https:\/\/chromium-review.googlesource.com\/c\/v8\/v8\/+\/2062396\">la correcci\u00f3n<\/a><\/noindex> y en un plazo de tres d\u00edas pudieron preparar <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/wp-content\/uploads\/2020\/02\/exp.zip\">exploit<\/a><\/noindex>, un exploit que afecta las versiones actuales de Chrome (el exploit publicado no inclu\u00eda componentes para eludir el aislamiento de sandbox). Google de inmediato <noindex><a rel=\"nofollow\" href=\"https:\/\/chromereleases.googleblog.com\/2020\/02\/stable-channel-update-for-desktop_24.html\">lanz\u00f3<\/a><\/noindex> public\u00f3 la actualizaci\u00f3n de Chrome 80.0.3987.122, corrigiendo el problema relacionado con el exploit propuesto <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=1053604\">vulnerabilidad<\/a><\/noindex> (CVE-2020-6418). La vulnerabilidad fue inicialmente identificada por ingenieros de Google y fue causada por un problema en el manejo de tipos en la operaci\u00f3n JSCreate, que puede ser explotado a trav\u00e9s del m\u00e9todo Array.pop o Array.prototype.pop. Es notable que un problema similar fue <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2019-18\/\">corregido<\/a><\/noindex> reportado en Firefox el verano pasado.<\/p>\n<p>Los investigadores tambi\u00e9n notaron que la creaci\u00f3n de exploits se ha simplificado debido a la inclusi\u00f3n en <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52312\">Chrome 80<\/a><\/noindex> un mecanismo <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/blog\/v8-release-80\">de empaquetado de punteros<\/a><\/noindex> (en lugar de almacenar el valor completo de 64 bits, solo se guardan los bits inferiores \u00fanicos del puntero, lo que permite reducir significativamente el consumo de memoria en el mont\u00f3n). Por ejemplo, algunas estructuras de datos al principio del mont\u00f3n, como la tabla de funciones integradas, los objetos &#171;native context&#187; y <noindex><a rel=\"nofollow\" href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/memory-problems\/memory-101\">los objetos ra\u00edz<\/a><\/noindex> del recolector de basura, ahora se alojan en direcciones empaquetadas predecibles y grabables.<\/p>\n<p>Es interesante que hace casi un a\u00f1o, Exodus Intelligence <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50457\">realiz\u00f3<\/a><\/noindex> una demostraci\u00f3n similar de la posibilidad de crear un exploit basado en el estudio del registro p\u00fablico de correcciones en V8, pero, al parecer, no se tomaron las decisiones adecuadas. En el lugar de los investigadores<br \/>\nde Exodus Intelligence pudieron estar delincuentes o agencias de inteligencia, que al crear un exploit podr\u00edan haber tenido d\u00edas o incluso semanas para explotar la vulnerabilidad de forma encubierta antes de que se formara otro lanzamiento de Chrome. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fuente: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52442\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Exodus Intelligence \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u043b\u0430\u0431\u043e\u0435 \u043c\u0435\u0441\u0442\u043e \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439 \u0432 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u0435 Chrome\/Chromium. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 \u0442\u0435\u043c, \u0447\u0442\u043e Google \u0440\u0430\u0441\u043a\u0440\u044b\u0432\u0430\u0435\u0442 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f, \u0447\u0442\u043e \u0432\u043d\u0435\u0441\u0451\u043d\u043d\u044b\u0435 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u0438\u043c\u0435\u044e\u0442 \u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0435 \u043a \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c \u0441 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u044c\u044e \u0442\u043e\u043b\u044c\u043a\u043e \u043f\u043e\u0441\u043b\u0435 \u0440\u0435\u043b\u0438\u0437\u0430, \u043d\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u0435\u0442 \u0432 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 \u043a\u043e\u0434 \u0434\u043b\u044f \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u0432 \u0434\u0432\u0438\u0436\u043a\u0435 V8 \u0434\u043e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u0440\u0435\u043b\u0438\u0437\u0430. \u041a\u0430\u043a\u043e\u0435-\u0442\u043e \u0432\u0440\u0435\u043c\u044f \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0445\u043e\u0434\u044f\u0442 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-71652","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Exodus Intelligence \u043f\u0440\u043e\u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043b\u0438 \u0441\u043b\u0430\u0431\u043e\u0435 \u043c\u0435\u0441\u0442\u043e \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0438\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0439.\" \/>\n\t<meta name=\"robots\" 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