{"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\/hu\/blog\/news\/0-day-uyazvimost-v-chrome-vyyavlennaya-cherez-analiz-izmenenij-v-dvizhke-v8","title":{"rendered":"0-napos sebezhet\u0151s\u00e9g a Chrome-ban, amely a V8 motor v\u00e1ltoz\u00e1sainak elemz\u00e9s\u00e9vel ker\u00fclt felfedez\u00e9sre.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Az Exodus Intelligence kutat\u00f3i demonstr\u00e1ltak<\/a><\/noindex> a Chrome\/Chromium k\u00f3dalapj\u00e1ban tapasztalhat\u00f3 sebezhet\u0151s\u00e9gek jav\u00edt\u00e1s\u00e1nak gyenge pontj\u00e1ra. A probl\u00e9ma az, hogy a Google csak a kiad\u00e1s ut\u00e1n hozza nyilv\u00e1noss\u00e1gra, hogy a v\u00e9grehajtott jav\u00edt\u00e1sok kapcsol\u00f3dnak a biztons\u00e1gi probl\u00e9m\u00e1khoz, de
\na V8 motorban a sebezhet\u0151s\u00e9g kik\u00fcsz\u00f6b\u00f6l\u00e9s\u00e9re k\u00f3dot ad hozz\u00e1 a t\u00e1rol\u00f3hoz a kiad\u00e1s el\u0151tti id\u0151szakban. Egy ideig a jav\u00edt\u00e1sok tesztel\u00e9s alatt \u00e1llnak, \u00e9s van egy ablak, amely alatt a sebezhet\u0151s\u00e9g kijav\u00edt\u00e1sra ker\u00fcl a k\u00f3dalapban \u00e9s el\u00e9rhet\u0151 az elemz\u00e9shez, de a felhaszn\u00e1l\u00f3i rendszereken a sebezhet\u0151s\u00e9g tov\u00e1bbra is nyitott marad. <\/p>\n

A t\u00e1rol\u00f3ban v\u00e9grehajtott v\u00e1ltoz\u00e1sokat vizsg\u00e1lva a kutat\u00f3k \u00e9szrevett\u00e9k a 19-\u00e9n hozz\u00e1adott friss\u00edt\u00e9st jav\u00edt\u00e1st<\/a><\/noindex> \u00e9s h\u00e1rom napon bel\u00fcl k\u00e9pesek voltak el\u0151k\u00e9sz\u00edteni exploit<\/a><\/noindex>, amely a Chrome aktu\u00e1lis verzi\u00f3it c\u00e9lozza meg (a nyilv\u00e1nos exploit nem tartalmazott elemeket a sandbox-izol\u00e1ci\u00f3 megker\u00fcl\u00e9s\u00e9re). A Google gyorsan kiadta<\/a><\/noindex> friss\u00edtette a Chrome-ot 80.0.3987.122, kijav\u00edtva a javasolt exploit-hoz kapcsol\u00f3d\u00f3 vulnerability<\/a><\/noindex> (CVE-2020-6418) sebezhet\u0151s\u00e9get. A sebezhet\u0151s\u00e9get eredetileg a Google m\u00e9rn\u00f6kei fedezt\u00e9k fel, \u00e9s a t\u00edpusok kezel\u00e9s\u00e9vel kapcsolatban mer\u00fclt fel egy probl\u00e9ma a JSCreate m\u0171veletben, amelyet az Array.pop vagy az Array.prototype.pop m\u00f3dszer r\u00e9v\u00e9n ki lehetett volna haszn\u00e1lni. \u00c9rdekes m\u00f3don hasonl\u00f3 probl\u00e9ma volt jav\u00edtva<\/a><\/noindex> a Firefoxban tavaly ny\u00e1ron.<\/p>\n

A kutat\u00f3k azt is \u00e9szrevett\u00e9k, hogy a k\u00f3dok l\u00e9trehoz\u00e1sa egyszer\u0171bb\u00e9 v\u00e1lt a Chrome 80<\/a><\/noindex> mechanizmus r\u00e9v\u00e9n c\u00edmt\u00e1rol\u00e1s<\/a><\/noindex> (a teljes 64-bites \u00e9rt\u00e9k helyett csak az egyedi als\u00f3 bitek t\u00e1rol\u00f3dnak, ami jelent\u0151sen cs\u00f6kkenti a mem\u00f3riafogyaszt\u00e1st a halomban). P\u00e9ld\u00e1ul n\u00e9h\u00e1ny, a halom elej\u00e9n tal\u00e1lhat\u00f3 adatstrukt\u00fara, mint p\u00e9ld\u00e1ul a be\u00e1gyazott f\u00fcggv\u00e9nyek t\u00e1bl\u00e1zata, az «native context» objektumok \u00e9s a szem\u00e9tgy\u0171jt\u0151 gy\u00f6k\u00e9robjektumai most el\u0151re meghat\u00e1rozott \u00e9s \u00edr\u00e1sra el\u00e9rhet\u0151 c\u00edmen helyezkednek el.<\/a><\/noindex> \u00c9rdekes, hogy egy \u00e9vvel ezel\u0151tt az Exodus Intelligence<\/p>\n

k\u00e9sz\u00edtett hasonl\u00f3 bemutat\u00f3t az exploit l\u00e9trehoz\u00e1s\u00e1nak lehet\u0151s\u00e9g\u00e9r\u0151l a V8 nyilv\u00e1nos hibajav\u00edt\u00f3 napl\u00f3ja alapj\u00e1n, de \u00fagy t\u0171nik, nem vont\u00e1k le a megfelel\u0151 k\u00f6vetkeztet\u00e9seket. Ha az Exodus Intelligence kutat\u00f3i k\u00f6z\u00f6tt<\/a><\/noindex> fekete kalaposok vagy titkosszolg\u00e1latok lettek volna, akik exploit l\u00e9trehoz\u00e1sakor ak\u00e1r napokat vagy heteket is rejtsenek egy sebezhet\u0151s\u00e9get a Chrome k\u00f6vetkez\u0151 kiad\u00e1s\u00e1nak megjelen\u00e9s\u00e9ig.
\nAz Exodus Intelligence szerint kibert\u00e1mad\u00f3k vagy titkos szolg\u00e1latok l\u00e9phettek be, akik egy exploit l\u00e9trehoz\u00e1sakor napokig vagy ak\u00e1r hetekig is k\u00e9pesek lehettek kihaszn\u00e1lni a sebezhet\u0151s\u00e9get, miel\u0151tt a k\u00f6vetkez\u0151 Chrome kiad\u00e1s megjelent. <\/p>\n

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

Forr\u00e1s: 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-day s\u00e9r\u00fcl\u00e9kenys\u00e9g a Chrome-ban, amelyet a V8 motorj\u00e1ban v\u00e9gzett v\u00e1ltoz\u00e1sok elemz\u00e9s\u00e9vel fedeztek fel | ProHoster","description":"Az Exodus Intelligence kutat\u00f3i bemutatt\u00e1k a 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