{"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\/da\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"0-dages s\u00e5rbarhed i Chrome, identificeret gennem analyse af \u00e6ndringer i V8-motoren","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Forskere fra Exodus Intelligence blev demonstreret<\/a><\/noindex> en svaghed i processen til at rette s\u00e5rbarheder i Chrome\/Chromiums kildekode. Problemet er relateret til, at Google kun afsl\u00f8rer, at de implementerede rettelser vedr\u00f8rer sikkerhedsproblemer efter udgivelsen, men
\ntilf\u00f8jer koden til repositoiret for at rette s\u00e5rbarheden i V8-motoren f\u00f8r udgivelsen. I en periode testes rettelserne, og der opst\u00e5r et vindue, hvor s\u00e5rbarheden er rettet i kildekoden og tilg\u00e6ngelig til analyse, men s\u00e5rbarheden forbliver uoprettet p\u00e5 brugernes systemer. <\/p>\n

Ved at studere \u00e6ndringerne i repositoiret lagde forskerne m\u00e6rke til, at der den 19. februar blev tilf\u00f8jet rettelse<\/a><\/noindex> og i l\u00f8bet af tre dage kunne de forberede exploit<\/a><\/noindex>, der p\u00e5virker de aktuelle versioner af Chrome (den offentliggjorte exploit inkluderede ikke komponenter til at omg\u00e5 sandbox-isoleringen). Google reagerede hurtigt udgivet<\/a><\/noindex> med opdateringen Chrome 80.0.3987.122, som l\u00f8ste den, der var relateret til den foresl\u00e5ede exploit ASLR i programmer med setuid-flaget og bestemme adressefordelingen i de indl\u00e6ste biblioteker gennem manipulation af milj\u00f8variablen LD_PREFER_MAP_32BIT_EXEC.<\/a><\/noindex> (CVE-2020-6418). S\u00e5rbarheden blev oprindeligt identificeret af ingeni\u00f8rer fra Google og for\u00e5rsaget af et problem med typebehandling i JSCreate-operationen, som kan udnyttes via metoden Array.pop eller Array.prototype.pop. Bem\u00e6rkelsesv\u00e6rdigt er, at et lignende problem blev rettet<\/a><\/noindex> i Firefox sidste sommer.<\/p>\n

Forskere lagde ogs\u00e5 m\u00e6rke til, at det er blevet lettere at oprette exploits p\u00e5 grund af inkluderingen af Chrome 80<\/a><\/noindex> en mekanisme til pakkning af pointere<\/a><\/noindex> (i stedet for det fulde 64-bit v\u00e6rdi gemmes kun de unikke lave bits af pointeren, hvilket signifikant reducerer hukommelsesforbruget i bunken). For eksempel, nogle data strukturer i begyndelsen af bunken, s\u00e5som tabellen for indbyggede funktioner, objekter «native context» og rodobjekter<\/a><\/noindex> i affaldssamleren, nu p\u00e5 forudsigelige og skrivebare pakkede adresser.<\/p>\n

Interessant er det, at n\u00e6sten for et \u00e5r siden, blev der af Exodus Intelligence foretaget en lignende demonstration af muligheden for at skabe exploits baseret p\u00e5 studiet af den offentlige log over rettelser i V8, men tilsyneladende blev der ikke draget de n\u00f8dvendige konklusioner. P\u00e5 stedet for forskerne<\/a><\/noindex> en lignende demonstration af muligheden for at skabe udnyttelser baseret p\u00e5 studiet af den offentlige log over rettelser i V8, men \u00e5benbart har der ikke v\u00e6ret de n\u00f8dvendige konsekvenser. Forskernes h\u00e5ndtering.
\nExodus Intelligence har vist, at der kunne v\u00e6re hackere eller efterretningstjenester, der ved oprettelsen af et exploit ville have mulighed for at skjule en s\u00e5rbarhed i dage eller endda uger, f\u00f8r den n\u00e6ste version af Chrome blev frigivet. <\/p>\n

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

Kilde: 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 \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 […]<\/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\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-dags s\u00e5rbarhed i Chrome, identificeret gennem analyse af \u00e6ndringer i V8-motoren | ProHoster","description":"Forskere fra Exodus Intelligence har demonstreret et svagt punkt i reparationsprocessen.","canonical_url":"https:\/\/prohoster.info\/da\/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":"da_DK","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 | ProHoster","og:description":"\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.","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2020-02-27T05:51:34+00:00","article:modified_time":"2020-03-03T13:10:40+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"71652","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-02-28 18:58:25","updated":"2022-10-01 14:35:49","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/71652","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=71652"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/71652\/revisions"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=71652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=71652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=71652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}