{"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\/pl\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"0-day podatno\u015b\u0107 w Chrome wykryta przez analiz\u0119 zmian w silniku V8","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Badacze z firmy Exodus Intelligence zademonstrowa\u0142y<\/a><\/noindex> zidentyfikowali s\u0142aby punkt w procesie naprawy luk w kodzie bazowym Chrome\/Chromium. Problem polega na tym, \u017ce Google ujawnia informacje o tym, \u017ce wprowadzone poprawki dotycz\u0105 problem\u00f3w z bezpiecze\u0144stwem dopiero po wydaniu aktualizacji, ale
\ndodaje do repozytorium kod w celu usuni\u0119cia luki w silniku V8 przed publikacj\u0105 wydania. Poprawki przez pewien czas przechodz\u0105 testy, co powoduje powstanie okna, w kt\u00f3rym luka jest naprawiona w kodzie bazowym i dost\u0119pna do analizy, ale pozostaje jeszcze nieza\u0142atana na systemach u\u017cytkownik\u00f3w. <\/p>\n

Analizuj\u0105c wprowadzone zmiany w repozytorium, badacze zwr\u00f3cili uwag\u0119 na dodanie 19 lutego poprawk\u0119<\/a><\/noindex> i w ci\u0105gu trzech dni zdo\u0142ali przygotowa\u0107 eksploit<\/a><\/noindex>, exploituj\u0105cy bie\u017c\u0105ce wersje Chrome (opublikowany exploit nie zawiera\u0142 komponent\u00f3w do obej\u015bcia izolacji sandbox). Firma Google szybko wyda\u0142a<\/a><\/noindex> wydaje aktualizacj\u0119 Chrome 80.0.3987.122, usuwaj\u0105c zwi\u0105zan\u0105 z proponowanym exploitem luka<\/a><\/noindex> (CVE-2020-6418). Luka zosta\u0142a pierwotnie wykryta przez in\u017cynier\u00f3w Google i by\u0142a spowodowana problemem z obs\u0142ug\u0105 typ\u00f3w w operacji JSCreate, kt\u00f3ra mo\u017ce by\u0107 wykorzystywana za pomoc\u0105 metody Array.pop lub Array.prototype.pop. Co ciekawe, podobny problem wyst\u0105pi\u0142 naprawiono<\/a><\/noindex> w Firefoxie latem ubieg\u0142ego roku.<\/p>\n

Badacze zauwa\u017cyli r\u00f3wnie\u017c, \u017ce upro\u015bci\u0142o to tworzenie exploit\u00f3w dzi\u0119ki w\u0142\u0105czeniu do Chrome 80<\/a><\/noindex> mechanizmu pakowania wska\u017anik\u00f3w<\/a><\/noindex> (zamiast pe\u0142nej 64-bitowej warto\u015bci s\u0105 przechowywane tylko unikalne dolne bity wska\u017anika, co pozwala znacznie zmniejszy\u0107 zu\u017cycie pami\u0119ci w stercie). Na przyk\u0142ad niekt\u00f3re struktury danych znajduj\u0105ce si\u0119 na pocz\u0105tku sterty, takie jak tabela wbudowanych funkcji, obiekty «native context» i obiekty g\u0142\u00f3wne<\/a><\/noindex> gromadzenia \u015bmieci, s\u0105 teraz umieszczane pod przewidywalnymi i dost\u0119pnymi do zapisu pakowanymi adresami.<\/p>\n

Ciekawe, \u017ce prawie rok temu firma Exodus Intelligence przeprowadzi\u0142a<\/a><\/noindex> podobn\u0105 demonstracj\u0119 mo\u017cliwo\u015bci stworzenia exploita na podstawie analizy publicznego dziennika poprawek w V8, ale najwyra\u017aniej nie podj\u0119to odpowiednich dzia\u0142a\u0144. W miejscu badaczy
\nExodus Intelligence mogli znale\u017a\u0107 si\u0119 przest\u0119pcy lub s\u0142u\u017cby specjalne, kt\u00f3re przy tworzeniu exploita mia\u0142yby mo\u017cliwo\u015b\u0107 przez dni, a nawet tygodnie, ukrycie eksploatacji luki przed kolejnym wydaniem Chrome. <\/p>\n

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

\u0179r\u00f3d\u0142o: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 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\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 […]<\/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\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd470-dniowa luka w Chrome, odkryta poprzez analiz\u0119 zmian w silniku V8 | ProHoster","description":"Badacze z firmy Exodus Intelligence zademonstrowali s\u0142aby punkt w procesie poprawek.","canonical_url":"https:\/\/prohoster.info\/pl\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"pl_PL","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd470-day \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 Chrome, \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u0447\u0435\u0440\u0435\u0437 \u0430\u043d\u0430\u043b\u0438\u0437 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432 \u0434\u0432\u0438\u0436\u043a\u0435 V8 | 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