{"id":54102,"date":"2019-12-18T00:00:00","date_gmt":"2019-12-17T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii"},"modified":"2020-02-18T14:02:04","modified_gmt":"2020-02-18T11:02:04","slug":"ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii","title":{"rendered":"Brugen af lignende Unicode-tegn til at omg\u00e5 autentificering","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

GitHub vist sig<\/a><\/noindex> udsat for et angreb, der g\u00f8r det muligt at f\u00e5 adgang til en konto ved hj\u00e6lp af manipulation af Unicode-tegn i e-mail. Problemet er, at nogle Unicode-tegn ved anvendelse af funktioner til omdannelse til sm\u00e5 eller store bogstaver overs\u00e6ttes til almindelige tegn, der ligner hinanden (n\u00e5r flere forskellige tegn overs\u00e6ttes til \u00e9t tegn \u2014 for eksempel overs\u00e6ttes det tyrkiske tegn «ı» og «i» til «I» ved omdannelse til store bogstaver).<\/p>\n

F\u00f8r kontrol af loginparametre i visse tjenester og applikationer bliver de brugerdata, der er indsendt, f\u00f8rst konverteret til store eller sm\u00e5 bogstaver, og derefter kontrolleret i databasen. Hvis tjenesten tillader anvendelse af unicode-tegn i brugernavnet eller e-mailen, kan angriberen anvende lignende unicode-tegn til at udf\u00f8re et angreb, der manipulerer med kollisionsproblemer i tegnregistreringskonverteringstabellerne (Unicode Case Mapping Collisions). <\/p>\n

‘ß’.toUpperCase() == ‘ss’.toUpperCase() \\\/\\\/ 0x0131
\n ‘K’.toLowerCase() == ‘K’.toLowerCase() \\\/\\\/ 0x212A
\n ‘John@Gıthub.com’.toUpperCase() == ‘John@Github.com’.toUpperCase()<\/p>\n

P\u00e5 GitHub kunne angriberen f\u00e5<\/a><\/noindex> gennem formularen til nulstilling af password igangs\u00e6tte tilsendelse af en genoprettelseskode til en anden e-mail ved at angive en adresse i formularen, som indeholder et unicode-tegn, der fremkalder en kollision (for eksempel, i stedet for mike@example.org blev e-mailen angivet som mı<\/b>ke@example.org). Adressen bestod kontrol, da den blev konverteret til store bogstaver og matchede den oprindelige adresse (mike@example.org), men ved afsendelse af brevet blev den indsat som den var, og genoprettelseskoden blev sendt til den falske adresse (mı<\/b>ke@example.org).<\/p>\n

Nogle af tegn<\/a><\/noindex>, der fremkalder kollisioner ved registreringskonvertering:<\/p>\n

ß \t0x00DF \tSS
\n ı \t0x0131 \tI
\n ſ \t0x017F \tS
\n ff \t0xFB00 \tFF
\n fi \t0xFB01 \tFI
\n fl \t0xFB02 \tFL
\n ffi \t0xFB03 \tFFI
\n ffl \t0xFB04 \tFFL
\n ſt \t0xFB05 \tST
\n st \t0xFB06 \tST
\n K \t0x212A \tk<\/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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