{"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\/it\/blog\/novosti-interneta\/ispolzovanie-pohozhih-unicode-simvolov-dlya-obhoda-autentifikatsii","title":{"rendered":"Utilizzo di caratteri Unicode simili per eludere l'autenticazione","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

GitHub si \u00e8 rivelato<\/a><\/noindex> \u00e8 vulnerabile a un attacco che consente l'accesso all'account attraverso la manipolazione dei caratteri Unicode nell'email. Il problema \u00e8 causato dal fatto che alcuni caratteri Unicode, quando si applicano funzioni di conversione in maiuscolo o minuscolo, vengono tradotti in caratteri comuni simili (quando diversi caratteri vengono tradotti in un unico carattere \u2014 ad esempio, il carattere turco «ı» e «i» quando vengono convertiti in maiuscolo si traducono in «I»).<\/p>\n

Prima di controllare i parametri di accesso in alcuni servizi e applicazioni, i dati forniti dall'utente vengono inizialmente convertiti in maiuscolo o in minuscolo e poi verificati nel database. Se il servizio consente l'uso di caratteri unicode nel login o nell'email, l'attaccante pu\u00f2 utilizzare caratteri unicode simili per eseguire un attacco che manipola le collisioni nelle tabelle di conversione dei caratteri (Collisioni di Mapping dei Casi Unicode). <\/p>\n

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

Su GitHub l'attaccante poteva<\/a><\/noindex> iniziare l'invio del codice di ripristino a un altro email tramite il modulo di recupero della password dimenticata, specificando un indirizzo nel modulo che include un simbolo unicode che causa una collisione (ad esempio, invece di mike@example.org era presente l'email mı<\/b>ke@example.org). L'indirizzo \u00e8 stato verificato poich\u00e9 \u00e8 stato trasformato in maiuscolo e corrispondeva all'indirizzo originale (mike@example.org), ma durante l'invio della mail \u00e8 stato utilizzato tal quale e il codice di ripristino \u00e8 stato inviato all'indirizzo falso (mı<\/b>ke@example.org).<\/p>\n

Alcuni dei simboli<\/a><\/noindex>, che causano collisioni durante la trasformazione del caso:<\/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

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

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