{"id":31710,"date":"2019-10-31T21:42:39","date_gmt":"2019-10-31T18:42:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov\/"},"modified":"2019-10-31T21:42:39","modified_gmt":"2019-10-31T18:42:39","slug":"uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/uyazvimost-v-adblock-plus-pozvolyayushhaya-vypolnit-kod-pri-ispolzovanii-somnitelnyh-filtrov","title":{"rendered":"S\u00e5rbarhed i Adblock Plus, der muligg\u00f8r k\u00f8rsel af kode ved brug af tvivlsomme filtre","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I adblockeren Adblock Plus opdaget<\/a><\/noindex> en s\u00e5rbarhed, der muligg\u00f8r<\/a><\/noindex> udf\u00f8relse af JavaScript-kode i konteksten af hjemmesider, n\u00e5r der anvendes ikke-verificerede filtre, der er forberedt af ondsindede akt\u00f8rer (for eksempel ved tilslutning af tredjeparts regels\u00e6t eller ved at \u00e6ndre regler under en MITM-angreb).<\/p>\n

Forfatterne af lister med filtergrupper kan organisere udf\u00f8relsen af deres kode i konteksten af de websteder, som brugeren \u00e5bner, ved at tilf\u00f8je regler med operatoren «rewrite<\/a><\/noindex>«, der muligg\u00f8r udskiftning af dele af URL'en. Rewrite-operatoren tillader ikke at \u00e6ndre v\u00e6rten i URL'en, men giver mulighed for frit at manipulere med foresp\u00f8rgselsargumenterne. Som en maske til erstatning m\u00e5 der kun bruges tekst, mens inds\u00e6ttelse af tags som script, object og subdocument blokeres<\/a><\/noindex>. <\/p>\n

Ikke desto mindre kan udf\u00f8relse af kode opn\u00e5s p\u00e5 en alternativ m\u00e5de.
\nNogle websteder, herunder Google Maps, Gmail og Google Images, anvender teknikken med dynamisk indl\u00e6sning af eksekverbare JavaScript-blokke, der sendes som ren tekst. Hvis serveren tillader omdirigering af foresp\u00f8rgsler, kan der opn\u00e5s en omdirigering til en anden v\u00e6rt ved at \u00e6ndre URL-parametrene (for eksempel i konteksten af Google kan omdirigeringen udf\u00f8res gennem API «google.com\/search<\/a><\/noindex>«). Udover v\u00e6rter, der tillader omdirigering, kan angrebet ogs\u00e5 udf\u00f8res mod tjenester, der tillader brugergenereret indhold (kodehosting, artikelplatforme osv.).<\/p>\n

Den foresl\u00e5ede angrebsmetode ber\u00f8rer kun sider, der dynamisk indl\u00e6ser linjer med JavaScript-kode (f.eks. gennem XMLHttpRequest eller Fetch) og derefter udf\u00f8rer dem. En anden vigtig begr\u00e6nsning er n\u00f8dvendigheden af at bruge omdirigering eller at placere vilk\u00e5rlige data p\u00e5 den oprindelige server, der leverer ressourcen. Ikke desto mindre vises aktualiteten af angrebet ved at vise, hvordan man organiserer udf\u00f8relsen af sin kode, n\u00e5r man \u00e5bner maps.google.com, ved hj\u00e6lp af omdirigering gennem «google.com\/search».<\/p>\n

Retningen er stadig under forberedelse. Problemet ber\u00f8rer ogs\u00e5 blokkeringsprogrammerne AdBlock<\/a><\/noindex> og uBlock<\/a><\/noindex>. Adblockeren uBlock Origin er ikke s\u00e5rbar over for problemet, da den ikke underst\u00f8tter operatoren «rewrite». I sin tid var forfatteren af uBlock Origin
\nsit st\u00f8tte<\/a><\/noindex> tilf\u00f8je st\u00f8tte til rewrite ved at henvise til potentielle sikkerhedsproblemer og utilstr\u00e6kkelig begr\u00e6nsning p\u00e5 v\u00e6rtens niveau (i stedet for rewrite blev muligheden querystrip foresl\u00e5et til rensning af foresp\u00f8rgselsparametre i stedet for at erstatte dem).<\/p>\n

Udviklerne af Adblock Plus mener, at det er usandsynligt, at reelle angreb vil finde sted, da alle \u00e6ndringer i de officielle regel lister gennemg\u00e5r en anmeldelse, og tilslutningen af tredjeparts lister praktiseres sj\u00e6ldent af brugerne. Erstatning af regler via MITM udelukkes af standardanvendelsen af HTTPS til download af de officielle blokering lister (for de andre lister planl\u00e6gges det at forbyde download via HTTP i en fremtidig udgave). Til blokering af angreb p\u00e5 websteder kan direktiver anvendes CSP<\/a><\/noindex> (Content Security Policy), hvor man tydeligt kan definere de v\u00e6rter, som m\u00e5 downloades eksterne ressourcer fra. <\/p>\n

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

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

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