{"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\/sv\/blog\/news\/rezultaty-audita-tor-browser-i-komponentov-infrastruktury-tor","title":{"rendered":"Resultat fr\u00e5n granskningen av Tor Browser och Tor-infrastrukturens komponenter","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Utvecklarna av det anonyma n\u00e4tverket Tor har publicerat resultaten av en revision av Tor Browser och de verktyg som utvecklas av projektet, inklusive OONI Probe, rdsys, BridgeDB och Conjure, som anv\u00e4nds f\u00f6r att kringg\u00e5 censur. Revisionen utf\u00f6rdes av f\u00f6retaget Cure53 fr\u00e5n november 2022 till april 2023.     <\/p>\n<p>Under granskningen identifierades 9 s\u00e5rbarheter, varav tv\u00e5 klassificerades som farliga, en fick ett medelh\u00f6gt riskv\u00e4rde och 6 klassades som problem med l\u00e5g risk. Dessutom hittades 10 problem i kodbasen som klassificerades som icke-s\u00e4kerhetsrelaterade brister. Sammanfattningsvis bed\u00f6mdes Tor-projektets kod som f\u00f6renlig med metoder f\u00f6r s\u00e4ker programmering.      <\/p>\n<p>Den f\u00f6rsta farliga s\u00e5rbarheten fanns i backend av det distribuerade systemet rdsys, som ansvarar f\u00f6r att leverera resurser till censurerade anv\u00e4ndare, som proxylistor och nedladdningsl\u00e4nkar. S\u00e5rbarheten orsakas av avsaknaden av autentisering vid anrop av resursregistreringshanteraren, vilket till\u00e4t en angripare att registrera sin egen skadliga resurs f\u00f6r att leverera till anv\u00e4ndarna. Utnyttjande av detta inneb\u00e4r att skicka en HTTP-beg\u00e4ran till rdsys-hanteraren.   <center><img decoding=\"async\" alt=\"Resultat fr\u00e5n granskningen av Tor Browser och Tor-infrastrukturens komponenter\" src=\"\/wp-content\/uploads\/2023\/10\/59560b2962adcce743937eb500061be1.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>      <\/p>\n<p>Den andra farliga s\u00e5rbarheten hittades i Tor Browser och orsakades av bristande verifiering av digital signatur vid h\u00e4mtning av listan \u00f6ver brottoch fr\u00e5n rdsys och BridgeDB. Eftersom listan laddas ner till webbl\u00e4saren innan anslutning till det anonyma Tor-n\u00e4tverket, gjorde bristen p\u00e5 kontroll av den kryptografiska digitala signaturen det m\u00f6jligt f\u00f6r en angripare att manipulera inneh\u00e5llet i listan, till exempel genom att avlyssna anslutningen eller hacka  <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-los-angeles\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3897\">servern<\/a>, \u00f6ver vilken listan distribueras. Vid en lyckad attack kunde angriparen uppr\u00e4tta anslutningar f\u00f6r anv\u00e4ndarna via sin egen komprometterade bro.        <\/p>\n<p>En s\u00e5rbarhet med medelh\u00f6g risk fanns i rdsys underh\u00e5llsskriptet som till\u00e4t en angripare att h\u00f6ja sina privilegier fr\u00e5n anv\u00e4ndaren nobody till anv\u00e4ndaren rdsys, om det fanns tillg\u00e5ng till <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sv\/server\/dts-shicago\/\"   title=\"servern\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"2930\">servern<\/a> och m\u00f6jlighet att skriva till katalogen f\u00f6r tempor\u00e4ra filer. Utnyttjande av s\u00e5rbarheten best\u00e5r av att byta ut den exekverbara filen som placeras i katalogen \/tmp. Att erh\u00e5lla r\u00e4ttigheter som rdsys-anv\u00e4ndare till\u00e5ter angriparen att g\u00f6ra \u00e4ndringar i de exekverbara filer som k\u00f6rs genom rdsys.    <\/p>\n<p>L\u00e5ggradiga s\u00e5rbarheter var fr\u00e4mst kopplade till anv\u00e4ndning av f\u00f6r\u00e5ldrade beroenden med k\u00e4nda s\u00e5rbarheter eller m\u00f6jlighet till en denial of service-attack. Fr\u00e5n de mindre s\u00e5rbarheterna i Tor Browser kan man notera m\u00f6jligheten att kringg\u00e5 JavaScript-utf\u00f6randef\u00f6rbudet vid h\u00f6gsta skyddsniv\u00e5, bristen p\u00e5 begr\u00e4nsningar f\u00f6r filuppladdningar och potentiell informationsl\u00e4ckage genom anv\u00e4ndarens startsida, vilket g\u00f6r det m\u00f6jligt att sp\u00e5ra anv\u00e4ndare mellan omstarter.    <\/p>\n<p>Alla s\u00e5rbarheter har nu \u00e5tg\u00e4rdats, och bland annat har autentisering implementerats f\u00f6r alla rdsys-behandlare och kontroller f\u00f6r de signerade listorna som laddas in i Tor Browser har lagts till.      <\/p>\n<p>Dessutom kan man notera lanseringen av Tor Browser 13.0.1. Utsl\u00e4ppet \u00e4r synkroniserat med kodbasen f\u00f6r Firefox 115.4.0 ESR, vilken \u00e5tg\u00e4rdat 19 s\u00e5rbarheter (13 erk\u00e4nda som farliga). Korrigeringar av s\u00e5rbarheter fr\u00e5n Firefox 119 har \u00f6verf\u00f6rts till Tor Browser 13.0.1 f\u00f6r Android.<br \/>\n<br \/>K\u00e4lla: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=59999\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Cure53 \u0441 \u043d\u043e\u044f\u0431\u0440\u044f 2022 \u0433\u043e\u0434\u0430 \u043f\u043e \u0430\u043f\u0440\u0435\u043b\u044c 2023 \u0433\u043e\u0434\u0430. \u0412 \u0445\u043e\u0434\u0435 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0431\u044b\u043b\u0438 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u044b 9 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0435\u0439, \u0434\u0432\u0435 \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043e\u0442\u043d\u0435\u0441\u0435\u043d\u044b \u043a \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0438\u0438 \u043e\u043f\u0430\u0441\u043d\u044b\u0445, \u043e\u0434\u043d\u043e\u0439 \u043f\u0440\u0438\u0441\u0432\u043e\u0435\u043d \u0441\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438, [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":111113,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-111112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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