{"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\/fr\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"Vuln\u00e9rabilit\u00e9 0-day dans Chrome, identifi\u00e9e gr\u00e2ce \u00e0 l'analyse des modifications apport\u00e9es au moteur V8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Les chercheurs de la soci\u00e9t\u00e9 Exodus Intelligence <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/2020\/02\/24\/a-eulogy-for-patch-gapping\/\">ont d\u00e9montr\u00e9<\/a><\/noindex> une faiblesse dans le processus de correction des vuln\u00e9rabilit\u00e9s dans la base de code de Chrome\/Chromium. Le probl\u00e8me r\u00e9side dans le fait que Google divulgue des informations, indiquant que les corrections apport\u00e9es sont li\u00e9es \u00e0 des probl\u00e8mes de s\u00e9curit\u00e9 uniquement apr\u00e8s la sortie, mais<br \/>\najoute dans le d\u00e9p\u00f4t du code pour corriger la vuln\u00e9rabilit\u00e9 dans le moteur V8 avant la publication de la version. Pendant un certain temps, les corrections subissent des tests et il existe une fen\u00eatre, durant laquelle la vuln\u00e9rabilit\u00e9 est corrig\u00e9e dans la base de code et disponible pour analyse, mais la vuln\u00e9rabilit\u00e9 n'est pas corrig\u00e9e sur les syst\u00e8mes des utilisateurs. <\/p>\n<p>En examinant les modifications apport\u00e9es au d\u00e9p\u00f4t, les chercheurs ont remarqu\u00e9 l'ajout fait le 19 f\u00e9vrier <noindex><a rel=\"nofollow\" href=\"https:\/\/chromium-review.googlesource.com\/c\/v8\/v8\/+\/2062396\">la correction<\/a><\/noindex> et en trois jours, ils ont pu pr\u00e9parer <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/wp-content\/uploads\/2020\/02\/exp.zip\">un exploit<\/a><\/noindex>, affectant les versions actuelles de Chrome (l'exploit publi\u00e9 n'incluait pas de composants pour contourner l'isolement sandbox). La soci\u00e9t\u00e9 Google a rapidement <noindex><a rel=\"nofollow\" href=\"https:\/\/chromereleases.googleblog.com\/2020\/02\/stable-channel-update-for-desktop_24.html\">une mise \u00e0 jour du micrologiciel et un SDK pour l'environnement SGX, dans lequel elle a tent\u00e9 de bloquer l'attaque par contournement. Les m\u00e9thodes propos\u00e9es d'attaque ne sont actuellement applicables qu'aux processeurs Intel, mais il n'est pas exclu que LVI soit adapt\u00e9 \u00e0 d'autres processeurs susceptibles d'\u00eatre sujets aux attaques de type Meltdown.<\/a><\/noindex> publi\u00e9 la mise \u00e0 jour Chrome 80.0.3987.122, corrigeant la vuln\u00e9rabilit\u00e9 li\u00e9e \u00e0 l'exploit propos\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=1053604\">CVE-2020-10174<\/a><\/noindex> (CVE-2020-6418). La vuln\u00e9rabilit\u00e9 a \u00e9t\u00e9 initialement identifi\u00e9e par des ing\u00e9nieurs de Google et \u00e9tait caus\u00e9e par un probl\u00e8me de traitement des types dans l'op\u00e9ration JSCreate, qui peut \u00eatre exploit\u00e9 via la m\u00e9thode Array.pop ou Array.prototype.pop. Il est int\u00e9ressant de noter qu'un probl\u00e8me similaire a \u00e9t\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2019-18\/\">corrig\u00e9<\/a><\/noindex> dans Firefox l'\u00e9t\u00e9 dernier.<\/p>\n<p>Les chercheurs ont \u00e9galement not\u00e9 que la cr\u00e9ation d'exploits \u00e9tait simplifi\u00e9e gr\u00e2ce \u00e0 l'inclusion dans <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52312\">Chrome 80<\/a><\/noindex> le m\u00e9canisme <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/blog\/v8-release-80\">d'emballage des pointeurs<\/a><\/noindex> (au lieu de stocker une valeur enti\u00e8re de 64 bits, seules les uniques bits inf\u00e9rieurs du pointeur sont conserv\u00e9s, ce qui permet de r\u00e9duire consid\u00e9rablement la consommation de m\u00e9moire dans le tas). Par exemple, certaines structures de donn\u00e9es situ\u00e9es au d\u00e9but du tas, telles que la table des fonctions int\u00e9gr\u00e9es, les objets \u00ab native context \u00bb et <noindex><a rel=\"nofollow\" href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/memory-problems\/memory-101\">les objets racines<\/a><\/noindex> du ramasse-miettes, sont maintenant plac\u00e9s \u00e0 des adresses pr\u00e9visibles et accessibles en \u00e9criture.<\/p>\n<p>Il est int\u00e9ressant de noter qu'il y a presque un an, la soci\u00e9t\u00e9 Exodus Intelligence <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50457\">avait r\u00e9alis\u00e9<\/a><\/noindex> une d\u00e9monstration similaire sur la possibilit\u00e9 de cr\u00e9er un exploit bas\u00e9 sur l'examen du journal public des corrections dans V8, mais, il semble, aucune conclusion n'a \u00e9t\u00e9 tir\u00e9e. Au niveau des chercheurs<br \/>\nExodus Intelligence a pu \u00eatre infiltr\u00e9e par des cybercriminels ou des agences gouvernementales, qui, en cr\u00e9ant un exploit, auraient eu la possibilit\u00e9 d'exploiter une vuln\u00e9rabilit\u00e9 pendant des jours, voire des semaines, avant la sortie d'une nouvelle version de Chrome. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Source : <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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