{"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\/it\/blog\/novosti-interneta\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"Vulnerabilit\u00e0 0-day in Chrome, scoperta tramite analisi delle modifiche nel motore V8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I ricercatori di Exodus Intelligence <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/2020\/02\/24\/a-eulogy-for-patch-gapping\/\">\u00e8 stato dimostrato<\/a><\/noindex> un punto debole nel processo di correzione delle vulnerabilit\u00e0 nel codice di base di Chrome\/Chromium. Il problema risiede nel fatto che Google rivela informazioni che le correzioni apportate sono relative a problemi di sicurezza solo dopo il rilascio, ma<br \/>\naggiunge nel repository il codice per risolvere la vulnerabilit\u00e0 nel motore V8 prima della pubblicazione del rilascio. Per un certo periodo, le correzioni vengono testate e si crea una finestra temporale in cui la vulnerabilit\u00e0 viene corretta nel codice, ma rimane non risolta sui sistemi degli utenti. <\/p>\n<p>Analizzando le modifiche nel repository, i ricercatori hanno notato l'aggiunta del 19 febbraio <noindex><a rel=\"nofollow\" href=\"https:\/\/chromium-review.googlesource.com\/c\/v8\/v8\/+\/2062396\">la correzione<\/a><\/noindex> e in tre giorni sono riusciti a preparare <noindex><a rel=\"nofollow\" href=\"https:\/\/blog.exodusintel.com\/wp-content\/uploads\/2020\/02\/exp.zip\">sfrutta<\/a><\/noindex>, che colpisce le versioni attuali di Chrome (l'exploit pubblicato non includeva componenti per eludere l'isolamento sandbox). Google ha rapidamente <noindex><a rel=\"nofollow\" href=\"https:\/\/chromereleases.googleblog.com\/2020\/02\/stable-channel-update-for-desktop_24.html\">ha rilasciato<\/a><\/noindex> rilasciato l'aggiornamento Chrome 80.0.3987.122, risolvendo il problema relativo all'exploit proposto <noindex><a rel=\"nofollow\" href=\"https:\/\/bugs.chromium.org\/p\/chromium\/issues\/detail?id=1053604\">una vulnerabilit\u00e0<\/a><\/noindex> (CVE-2020-6418). La vulnerabilit\u00e0 era stata inizialmente individuata dagli ingegneri di Google ed era causata da un problema nella gestione dei tipi nell'operazione JSCreate, che pu\u00f2 essere sfruttata tramite il metodo Array.pop o Array.prototype.pop. \u00c8 interessante notare che un problema simile era <noindex><a rel=\"nofollow\" href=\"https:\/\/www.mozilla.org\/en-US\/security\/advisories\/mfsa2019-18\/\">\u00e8 stata corretta<\/a><\/noindex> stato in Firefox la scorsa estate.<\/p>\n<p>I ricercatori hanno anche notato che la creazione di exploit \u00e8 stata semplificata grazie all'inclusione nel <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52312\">Chrome 80<\/a><\/noindex> meccanismo <noindex><a rel=\"nofollow\" href=\"https:\/\/v8.dev\/blog\/v8-release-80\">di imballaggio dei puntatori<\/a><\/noindex> (invece di memorizzare il valore completo a 64 bit, vengono memorizzati solo i bit inferiori unici dei puntatori, permettendo cos\u00ec di ridurre significativamente il consumo di memoria nell'heap). Ad esempio, alcune strutture dati all'inizio dell'heap, come la tabella delle funzioni integrate, gli oggetti &#171;native context&#187; e <noindex><a rel=\"nofollow\" href=\"https:\/\/developers.google.com\/web\/tools\/chrome-devtools\/memory-problems\/memory-101\">gli oggetti radice<\/a><\/noindex> del garbage collector, ora vengono posizionati a indirizzi imballati prevedibili e scrivibili.<\/p>\n<p>\u00c8 interessante notare che quasi un anno fa Exodus Intelligence ha <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50457\">fatto<\/a><\/noindex> una dimostrazione analoga della possibilit\u00e0 di creare un exploit basato sull'analisi del registro pubblico delle correzioni in V8, ma, a quanto pare, non sono state tratte le giuste conclusioni. Al posto dei ricercatori<br \/>\ndi Exodus Intelligence, avrebbero potuto trovarsi malintenzionati o servizi segreti, che, durante la creazione dell'exploit, avrebbero potuto sfruttare la vulnerabilit\u00e0 in modo nascosto per giorni o addirittura settimane prima del rilascio di una nuova versione di Chrome. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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 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