{"id":111112,"date":"2023-10-26T21:10:14","date_gmt":"2023-10-26T19:10:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/rezultaty-audita-tor-browser-i-komponentov-infrastruktury-tor"},"modified":"2023-10-26T21:10:14","modified_gmt":"2023-10-26T19:10:15","slug":"rezultaty-audita-tor-browser-i-komponentov-infrastruktury-tor","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/rezultaty-audita-tor-browser-i-komponentov-infrastruktury-tor","title":{"rendered":"V\u00fdsledky auditu Tor Browseru a komponent\u016f infrastrukturn\u00edho syst\u00e9mu Tor.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1\u0159i anonymn\u00ed s\u00edt\u011b Tor publikovali v\u00fdsledky auditu prohl\u00ed\u017ee\u010de Tor Browser a n\u00e1stroj\u016f OONI Probe, rdsys, BridgeDB a Conjure, kter\u00e9 se pou\u017e\u00edvaj\u00ed k obch\u00e1zen\u00ed cenzury. Audit provedla firma Cure53 od listopadu 2022 do dubna 2023. <\/p>\n

B\u011bhem kontroly bylo odhaleno 9 zranitelnost\u00ed, z nich\u017e dv\u011b byly klasifikov\u00e1ny jako nebezpe\u010dn\u00e9, jedna jako st\u0159edn\u00ed a 6 jako probl\u00e9my s n\u00edzk\u00fdm stupn\u011bm nebezpe\u010dnosti. V z\u00e1kladn\u00edm k\u00f3du bylo tak\u00e9 nalezeno 10 probl\u00e9m\u016f, kter\u00e9 byly za\u0159azeny do kategorie nezabezpe\u010den\u00fdch nedostatk\u016f. Celkov\u011b byl k\u00f3d projektu Tor hodnocen jako odpov\u00eddaj\u00edc\u00ed praktik\u00e1m bezpe\u010dn\u00e9ho programov\u00e1n\u00ed. <\/p>\n

Prvn\u00ed nebezpe\u010dn\u00e1 zranitelnost byla p\u0159\u00edtomna v backendu distribuovan\u00e9ho syst\u00e9mu rdsys, kter\u00fd zaji\u0161\u0165uje dod\u00e1vku cenzurovan\u00fdm u\u017eivatel\u016fm zdroj\u016f, jako jsou seznamy proxy a odkazy ke sta\u017een\u00ed. Zranitelnost byla zp\u016fsobena absenc\u00ed autentizace p\u0159i p\u0159\u00edstupu k registru zdroj\u016f a umo\u017enila \u00fato\u010dn\u00edkovi registrovat vlastn\u00ed \u0161kodliv\u00fd zdroj pro dod\u00e1n\u00ed u\u017eivatel\u016fm. Vyu\u017eit\u00ed se redukovalo na zasl\u00e1n\u00ed HTTP po\u017eadavku na zpracovatele rdsys.

\"V\u00fdsledky<\/center> <\/p>\n

Druh\u00e1 nebezpe\u010dn\u00e1 zranitelnost byla nalezena v Tor Browseru a vznikla v d\u016fsledku absence ov\u011b\u0159en\u00ed digit\u00e1ln\u00edho podpisu p\u0159i z\u00edsk\u00e1v\u00e1n\u00ed seznamu most\u016f p\u0159es rdsys a BridgeDB. Jeliko\u017e je seznam na\u010d\u00edt\u00e1n do prohl\u00ed\u017ee\u010de p\u0159ed p\u0159ipojen\u00edm k anonymn\u00ed s\u00edti Tor, absence kontroly kryptografick\u00e9ho digit\u00e1ln\u00edho podpisu umo\u017e\u0148ovala \u00fato\u010dn\u00edkovi zm\u011bnit obsah seznamu, nap\u0159\u00edklad \u00fatokem na p\u0159ipojen\u00ed nebo hackem serveru<\/a>, kter\u00fdm je seznam distribuov\u00e1n. V p\u0159\u00edpad\u011b \u00fasp\u011b\u0161n\u00e9ho \u00fatoku mohl \u00fato\u010dn\u00edk organizovat p\u0159ipojen\u00ed u\u017eivatel\u016f p\u0159es vlastn\u00ed kompromitovan\u00fd most. <\/p>\n

Zranitelnost st\u0159edn\u00ed \u00farovn\u011b byla p\u0159\u00edtomna v pod syst\u00e9mu rdsys ve skriptu pro nasazen\u00ed sestaven\u00ed a umo\u017enila \u00fato\u010dn\u00edkovi zv\u00fd\u0161it sv\u00e9 opr\u00e1vn\u011bn\u00ed z u\u017eivatele nobody na u\u017eivatele rdsys, pokud m\u011bl p\u0159\u00edstup k serveru<\/a> a mo\u017enost z\u00e1pisu do adres\u00e1\u0159e s do\u010dasn\u00fdmi soubory. Vyu\u017eit\u00ed zranitelnosti spo\u010d\u00edvalo ve v\u00fdm\u011bn\u011b spustiteln\u00e9ho souboru um\u00edst\u011bn\u00e9ho v adres\u00e1\u0159i \/tmp. Z\u00edsk\u00e1n\u00ed pr\u00e1v u\u017eivatele rdsys umo\u017e\u0148uje \u00fato\u010dn\u00edkovi prov\u00e1d\u011bt zm\u011bny ve spustiteln\u00fdch souborech vykon\u00e1van\u00fdch p\u0159es rdsys. <\/p>\n

Zranitelnosti n\u00edzk\u00e9 \u00farovn\u011b nebezpe\u010d\u00ed byly p\u0159ev\u00e1\u017en\u011b spojeny s pou\u017e\u00edv\u00e1n\u00edm zastaral\u00fdch z\u00e1vislost\u00ed, kter\u00e9 obsahovaly zn\u00e1m\u00e9 zranitelnosti, nebo s mo\u017enost\u00ed proveden\u00ed \u00fatoku na nedostupnost slu\u017eby. Z drobn\u00fdch zranitelnost\u00ed v Tor Browseru je t\u0159eba zm\u00ednit mo\u017enost obch\u00e1zen\u00ed z\u00e1kaz\u016f vykon\u00e1v\u00e1n\u00ed JavaScriptu p\u0159i nastaven\u00ed nejvy\u0161\u0161\u00ed \u00farovn\u011b ochrany, absenci omezen\u00ed pro nahr\u00e1v\u00e1n\u00ed soubor\u016f a potenci\u00e1ln\u00ed \u00fanik informac\u00ed prost\u0159ednictv\u00edm u\u017eivatelsk\u00e9 dom\u00e1c\u00ed str\u00e1nky, co\u017e umo\u017e\u0148uje sledov\u00e1n\u00ed u\u017eivatel\u016f mezi restartov\u00e1n\u00edmi. <\/p>\n

V sou\u010dasnosti byly v\u0161echny zranitelnosti odstran\u011bny, mimo jin\u00e9 byla implementov\u00e1na autentizace pro v\u0161echny zpracovatele rdsys a byla p\u0159id\u00e1na kontrola nahr\u00e1van\u00fdch seznam\u016f v Tor Browseru podle digit\u00e1ln\u00edho podpisu. <\/p>\n

D\u00e1le je t\u0159eba poznamenat vyd\u00e1n\u00ed prohl\u00ed\u017ee\u010de Tor Browser 13.0.1. Vyd\u00e1n\u00ed je synchronizov\u00e1no s k\u00f3dovou z\u00e1kladnou Firefox 115.4.0 ESR, ve kter\u00e9 bylo odstran\u011bno 19 zranitelnost\u00ed (13 je pova\u017eov\u00e1no za nebezpe\u010dn\u00e9). Opravy zranitelnost\u00ed byly p\u0159eneseny do verze Tor Browser 13.0.1 pro Android z v\u011btve Firefox 119.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u0430\u043d\u043e\u043d\u0438\u043c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 Tor \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u0430\u0443\u0434\u0438\u0442\u0430 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430 Tor Browser \u0438 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u043e\u043c \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0435\u0432 OONI Probe, rdsys, BridgeDB \u0438 Conjure, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u043e\u0431\u0445\u043e\u0434\u0430 \u0446\u0435\u043d\u0437\u0443\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u0410\u0443\u0434\u0438\u0442 \u043f\u0440\u043e\u0432\u043e\u0434\u0438\u043b\u0441\u044f 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