{"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\/sk\/blog\/news\/rezultaty-audita-tor-browser-i-komponentov-infrastruktury-tor","title":{"rendered":"V\u00fdsledky auditu Tor Browser a komponentov infra\u0161trukt\u00fary Tor.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdvoj\u00e1ri anonymnej siete Tor zverejnili v\u00fdsledky auditu prehliada\u010da Tor Browser a n\u00e1strojov vyvinut\u00fdch projektom OONI Probe, rdsys, BridgeDB a Conjure, ktor\u00e9 sa pou\u017e\u00edvaj\u00fa na obch\u00e1dzanie cenz\u00fary. Audit uskuto\u010dnila spolo\u010dnos\u0165 Cure53 od novembra 2022 do apr\u00edla 2023. <\/p>\n

Po\u010das kontroly bolo zisten\u00fdch 9 zranite\u013enost\u00ed, z ktor\u00fdch dve s\u00fa zaraden\u00e9 do kateg\u00f3rie nebezpe\u010dn\u00fdch, jedna bola ozna\u010den\u00e1 ako stredne nebezpe\u010dn\u00e1 a 6 bolo zaraden\u00fdch medzi probl\u00e9my s n\u00edzkou \u00farov\u0148ou nebezpe\u010denstva. V zdrojovom k\u00f3de bola n\u00e1jden\u00e1 aj 10 probl\u00e9mov, ktor\u00e9 sa pova\u017euj\u00fa za nedostatky nes\u00favisiace so bezpe\u010dnos\u0165ou. Celkovo bol k\u00f3d projektu Tor ozna\u010den\u00fd ako zodpovedaj\u00faci praktik\u00e1m bezpe\u010dn\u00e9ho programovania. <\/p>\n

Prv\u00e1 nebezpe\u010dn\u00e1 zranite\u013enos\u0165 sa nach\u00e1dzala v backendovej \u0161trukt\u00fare distribuovan\u00e9ho syst\u00e9mu rdsys, ktor\u00fd zabezpe\u010duje dod\u00e1vanie zdrojov cenzurovan\u00fdm pou\u017e\u00edvate\u013eom, ako s\u00fa zoznamy proxy a odkazy na stiahnutie. Zranite\u013enos\u0165 je sp\u00f4soben\u00e1 absenciou autentifik\u00e1cie pri pr\u00edstupe k spr\u00e1vcovi registr\u00e1cie zdrojov a umo\u017enila \u00fato\u010dn\u00edkovi registrova\u0165 vlastn\u00fd \u0161kodliv\u00fd zdroj na dod\u00e1vanie pou\u017e\u00edvate\u013eom. Vyu\u017eitie sa obmedzuje na odoslanie HTTP po\u017eiadavky spr\u00e1vcovi rdsys.

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

Druh\u00e1 nebezpe\u010dn\u00e1 zranite\u013enos\u0165 bola n\u00e1jden\u00e1 v Tor Browser a vznikla z d\u00f4vodu absencie overenia digit\u00e1lneho podpisu pri z\u00edskavan\u00ed zoznamu mostov\u00fdch uzlov cez rdsys a BridgeDB. Ke\u010f\u017ee sa zoznam na\u010d\u00edtava do prehliada\u010da pred pripojen\u00edm k anonymnej sieti Tor, absencia overenia kryptografick\u00e9ho digit\u00e1lneho podpisu umo\u017enila \u00fato\u010dn\u00edkovi zmeni\u0165 obsah zoznamu, napr\u00edklad prostredn\u00edctvom zachytenia spojenia alebo hacku, servera<\/a>, prostredn\u00edctvom ktor\u00e9ho sa distribuuje zoznam. V pr\u00edpade \u00faspe\u0161n\u00e9ho \u00fatoku by mohol \u00fato\u010dn\u00edk usporiada\u0165 pripojenie pou\u017e\u00edvate\u013eov cez vlastn\u00fd kompromitovan\u00fd mostov\u00fd uzol. <\/p>\n

Zranite\u013enos\u0165 so stredn\u00fdm nebezpe\u010denstvom sa nach\u00e1dzala v subsyst\u00e9me rdsys v skripte na nasadzovanie zost\u00e1v a umo\u017enila \u00fato\u010dn\u00edkovi zv\u00fd\u0161i\u0165 svoje privil\u00e9gium z pou\u017e\u00edvate\u013ea nobody na pou\u017e\u00edvate\u013ea rdsys, pokia\u013e mal pr\u00edstup k serveru<\/a> a mo\u017enos\u0165 z\u00e1pisu do adres\u00e1ra s do\u010dasn\u00fdmi s\u00fabormi. Vyu\u017eitie zranite\u013enosti sa obmedzuje na nahradenie vykonate\u013en\u00e9ho s\u00faboru umiestnen\u00e9ho v adres\u00e1ri \/tmp. Z\u00edskanie pr\u00e1v pou\u017e\u00edvate\u013ea rdsys umo\u017e\u0148uje \u00fato\u010dn\u00edkovi vykona\u0165 zmeny vo vykonate\u013en\u00fdch s\u00faboroch spusten\u00fdch cez rdsys. <\/p>\n

Zranite\u013enosti s n\u00edzkym stup\u0148om nebezpe\u010denstva boli v\u00e4\u010d\u0161inou spojen\u00e9 s pou\u017e\u00edvan\u00edm zastaran\u00fdch z\u00e1vislost\u00ed, ktor\u00e9 obsahovali zn\u00e1me zranite\u013enosti, alebo s mo\u017enos\u0165ou vykonania \u00fatoku typu denial of service. Medzi nev\u00fdznamn\u00fdmi zranite\u013enos\u0165ami v Tor Browser sa uv\u00e1dza mo\u017enos\u0165 ob\u00eddenia z\u00e1kazu vykon\u00e1vania JavaScriptu pri nastaven\u00ed najvy\u0161\u0161ej \u00farovne ochrany, absencia obmedzen\u00ed pri s\u0165ahovan\u00ed s\u00faborov a potenci\u00e1lne \u00faniky inform\u00e1ci\u00ed cez pou\u017e\u00edvate\u013esk\u00fa domovsk\u00fa str\u00e1nku, \u010do umo\u017e\u0148uje sledova\u0165 pou\u017e\u00edvate\u013eov medzi re\u0161tartami. <\/p>\n

V s\u00fa\u010dasnosti s\u00fa v\u0161etky zranite\u013enosti opraven\u00e9, medzi in\u00fdmi bola implementovan\u00e1 autentifik\u00e1cia pre v\u0161etky spracov\u00e1van\u00e9 rdsys a bola pridan\u00e1 kontrola nahr\u00e1van\u00fdch zoznamov v Tor Browser pod\u013ea digit\u00e1lneho podpisu. <\/p>\n

Dodato\u010dne je potrebn\u00e9 spomen\u00fa\u0165 vydanie Tor Browser 13.0.1. Vydanie je synchronizovan\u00e9 s k\u00f3dovou z\u00e1klad\u0148ou Firefox 115.4.0 ESR, v ktorej bolo odstr\u00e1nen\u00fdch 19 zranite\u013enost\u00ed (13 pova\u017eovan\u00fdch za nebezpe\u010dn\u00e9). Do verzie Tor Browser 13.0.1 pre Android boli prenesen\u00e9 opravy zranite\u013enost\u00ed z vetvy 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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