{"id":54354,"date":"2019-12-24T00:00:00","date_gmt":"2019-12-23T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql"},"modified":"2020-02-18T14:02:21","modified_gmt":"2020-02-18T11:02:21","slug":"uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-sqlite-pozvolyayushhaya-udalyonno-atakovat-chrome-cherez-websql","title":{"rendered":"Zranitelnost v SQLite, kter\u00e1 umo\u017e\u0148uje vzd\u00e1len\u00fd \u00fatok na Chrome p\u0159es WebSQL","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Bezpe\u010dnostn\u00ed v\u00fdzkumn\u00edci z \u010d\u00ednsk\u00e9 spole\u010dnosti Tencent p\u0159edstavili<\/a><\/noindex> novou verzi zranitelnosti Magellan<\/a><\/noindex> (CVE-2019-13734<\/a><\/noindex>), kter\u00e1 umo\u017e\u0148uje vykon\u00e1v\u00e1n\u00ed k\u00f3du p\u0159i zpracov\u00e1n\u00ed ur\u010dit\u00e9ho zp\u016fsobu form\u00e1tovan\u00fdch SQL konstrukc\u00ed v datab\u00e1zov\u00e9m syst\u00e9mu SQLite. Podobn\u00e1 zranitelnost byla byla vyd\u00e1na<\/a><\/noindex> t\u011bmito stejn\u00fdmi v\u00fdzkumn\u00edky p\u0159ed rokem. Zranitelnost je zaj\u00edmav\u00e1 t\u00edm, \u017ee umo\u017e\u0148uje vzd\u00e1len\u011b napadnout prohl\u00ed\u017ee\u010d Chrome a z\u00edskat kontrolu nad syst\u00e9mem u\u017eivatele p\u0159i otev\u0159en\u00ed webov\u00fdch str\u00e1nek \u0159\u00edzen\u00fdch \u00fato\u010dn\u00edkem. <\/p>\n

\u00datok na Chrome\/Chromium se prov\u00e1d\u00ed p\u0159es API WebSQL, jeho\u017e zpracov\u00e1n\u00ed je zalo\u017eeno na k\u00f3du SQLite. \u00datok na dal\u0161\u00ed aplikace je mo\u017en\u00fd pouze tehdy, pokud povoluj\u00ed p\u0159enos SQL konstrukc\u00ed do SQLite z vn\u011bj\u0161\u00edch zdroj\u016f, nap\u0159\u00edklad pou\u017e\u00edvaj\u00ed SQLite jako form\u00e1t pro v\u00fdm\u011bnu dat. Firefox nen\u00ed zraniteln\u00fd, proto\u017ee spole\u010dnost Mozilla odm\u00edtli<\/a><\/noindex> neimplementuje WebSQL v prosp\u011bch<\/a><\/noindex> API IndexedDB. <\/p>\n

Google probl\u00e9m odstranil ve verzi Chrome 79<\/a><\/noindex>. V k\u00f3du SQLite byl probl\u00e9m byla opraven\u00e1<\/a><\/noindex> 17. listopadu, a v k\u00f3dov\u00e9 z\u00e1kladn\u011b Chromia \u2014 21. listopadu<\/a><\/noindex>.
\nProbl\u00e9m se nach\u00e1z\u00ed v k\u00f3d\u011b<\/a><\/noindex> enginu pro fulltextov\u00e9 vyhled\u00e1v\u00e1n\u00ed FTS3 a prost\u0159ednictv\u00edm manipulace s st\u00ednov\u00fdmi tabulkami (shadow tables, zvl\u00e1\u0161tn\u00ed typ virtu\u00e1ln\u00edch tabulek s mo\u017enost\u00ed z\u00e1pisu) m\u016f\u017ee v\u00e9st k po\u0161kozen\u00ed indexu a p\u0159ete\u010den\u00ed vyrovn\u00e1vac\u00ed pam\u011bti. Podrobn\u00e9 informace o technice vyu\u017eit\u00ed budou zve\u0159ejn\u011bny b\u011bhem 90 dn\u016f.<\/p>\n

Nov\u00e1 verze SQLite s opravou zat\u00edm nebyla vytvo\u0159ena<\/a><\/noindex> (4. listopadu.<\/a><\/noindex> 31. prosince). Jako obranou proti ochran\u011b m\u016f\u017ee b\u00fdt od SQLite 3.26.0 pou\u017eit re\u017eim SQLITE_DBCONFIG_DEFENSIVE, kter\u00fd zakazuje z\u00e1pis do st\u00ednov\u00fdch tabulek a doporu\u010duje se povolit p\u0159i zpracov\u00e1n\u00ed extern\u00edch SQL po\u017eadavk\u016f v SQLite. V distribuc\u00edch zranitelnost v knihovn\u011b SQLite zat\u00edm z\u016fst\u00e1v\u00e1 neopravena v Debian<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, RHEL<\/a><\/noindex>, openSUSE\/SUSE<\/a><\/noindex>, Arch Linux<\/a><\/noindex>, Fedora<\/a><\/noindex>, FreeBSD<\/a><\/noindex>. Chromium ve v\u0161ech distribuc\u00edch ji\u017e bylo aktualizov\u00e1no a nen\u00ed zraniteln\u00e9, ale probl\u00e9m m\u016f\u017ee zas\u00e1hnout r\u016fzn\u00e9 alternativn\u00ed prohl\u00ed\u017ee\u010de a aplikace vyu\u017e\u00edvaj\u00edc\u00ed engin Chromium, jako\u017e i aplikace pro Android zalo\u017een\u00e9 na Webview.<\/p>\n

D\u00e1le v SQLite bylo tak\u00e9 odhaleno 4 m\u00e9n\u011b nebezpe\u010dn\u00e9 probl\u00e9my (CVE-2019-13750<\/a><\/noindex>, CVE-2019-13751<\/a><\/noindex>, CVE-2019-13752<\/a><\/noindex>, CVE-2019-13753<\/a><\/noindex>), kter\u00e9 mohou v\u00e9st k \u00faniku informac\u00ed a obch\u00e1zen\u00ed omezen\u00ed (mohou b\u00fdt pou\u017eity jako souvisej\u00edc\u00ed faktory pro \u00fatok na Chrome). Uveden\u00e9 probl\u00e9my byly opraveny v k\u00f3du SQLite 13. prosince. Celkov\u011b probl\u00e9my umo\u017enily v\u00fdzkumn\u00edk\u016fm p\u0159ipravit pracovn\u00ed exploit, kter\u00fd umo\u017e\u0148uje prov\u00e9st k\u00f3d v kontextu procesu Chromium odpov\u011bdn\u00e9ho za vykreslov\u00e1n\u00ed.<\/p>\n

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

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

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