{"id":35296,"date":"2019-10-31T22:03:29","date_gmt":"2019-10-31T19:03:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/predstavlena-novaya-tehnika-skrytoj-identifikatsii-sistemy-i-brauzera\/"},"modified":"2019-10-31T22:03:29","modified_gmt":"2019-10-31T19:03:29","slug":"predstavlena-novaya-tehnika-skrytoj-identifikatsii-sistemy-i-brauzera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/predstavlena-novaya-tehnika-skrytoj-identifikatsii-sistemy-i-brauzera","title":{"rendered":"\u00c8 stata presentata una nuova tecnica di identificazione nascosta del sistema e del browser.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un gruppo di ricercatori dell'Universit\u00e0 Tecnica di Graz (Austria), precedentemente noto per lo sviluppo di metodi di attacco  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50684\">MDS<\/a><\/noindex>,  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49032\">NetSpectre<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48591\">Throwhammer<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.ndss-symposium.org\/wp-content\/uploads\/2019\/02\/ndss2019_01B-4_Schwarz_paper.pdf\">ha rivelato<\/a><\/noindex> informazioni su una nuova tecnica di analisi tramite canali laterali, in grado di determinare la versione esatta del browser, il sistema operativo in uso, l'architettura della CPU e l'uso di estensioni per combattere l'identificazione furtiva. <\/p>\n<p>Per determinare i parametri indicati \u00e8 sufficiente eseguire nel browser un codice JavaScript preparato dai ricercatori. Nella pratica, il metodo pu\u00f2 essere utilizzato non solo come fonte aggiuntiva per l'identificazione indiretta dell'utente, ma anche per determinare i parametri dell'ambiente di sistema per l'applicazione mirata di exploit, tenendo conto del sistema operativo, dell'architettura e del browser. Il metodo \u00e8 efficace anche nell'utilizzo di browser che implementano meccanismi di blocco dell'identificazione furtiva, come Tor Browser. I codici sorgente del prototipo che implementa il metodo <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/IAIK\/jstemplate\">pubblicati<\/a><\/noindex> sotto licenza MIT.<\/p>\n<p>La definizione avviene sulla base dell'individuazione di modelli di stato delle propriet\u00e0 specifici per diversi browser in JavaScript e delle caratteristiche temporali delle operazioni, a seconda delle peculiarit\u00e0 del funzionamento di JIT, CPU e meccanismi di allocazione della memoria. La definizione delle propriet\u00e0 viene effettuata attraverso la generazione di un elenco di tutti gli oggetti accessibili da JavaScript. Si \u00e8 scoperto che il numero di oggetti \u00e8 direttamente correlato al motore del browser e alla sua versione. <\/p>\n<p>   function getProperties(o) {<br \/>\n      var result = [];<br \/>\n      while (o !== null) {<br \/>\n         result = result.concat(Reflect.ownKeys(o));<br \/>\n         o = Object.getPrototypeOf(o);<br \/>\n      }<br \/>\n      return result;<br \/>\n   }<\/p>\n<p>Ad esempio, per Firefox \u00e8 documentato il supporto per 2247 propriet\u00e0, mentre il numero reale di propriet\u00e0 definite, tenendo conto di quelle non documentate, \u00e8 di 15709 (in Tor Browser \u00e8 15639). Per Chrome sono dichiarate 2698 propriet\u00e0, mentre il numero effettivo \u00e8 di 13570 (in Chrome per Android \u00e8 13119). Il numero e i valori delle propriet\u00e0 cambiano da una versione all'altra del browser e in base ai diversi sistemi operativi. <\/p>\n<p>I valori e la presenza di determinate propriet\u00e0 possono essere utilizzati per identificare il tipo di sistema operativo. Ad esempio, in Kubuntu la propriet\u00e0 window.innerWidth \u00e8 impostata a 1000, mentre in Windows 10 \u00e8 1001. In Windows \u00e8 disponibile la propriet\u00e0 window.navigator.activeVRDisplays, mentre in Linux non \u00e8 presente. Per Android ci sono molte chiamate specifiche, ma non esiste window.SharedWorker. Per identificare il sistema operativo si propone anche di analizzare i parametri WebGL, il cui stato dipende dai driver. Inoltre, la chiamata WEBGL_debug_renderer_infoextension consente di ottenere informazioni sul motore di rendering OpenGL, che \u00e8 diverso per ogni sistema operativo. <\/p>\n<p>Per la determinazione della CPU, si utilizza la valutazione delle differenze nei tempi di esecuzione di vari blocchi di codice standard, la cui lavorazione dipende dall'architettura del set di istruzioni, considerando il comportamento JIT (si determina quanti registri CPU verranno impiegati e in quali casi il JIT generer\u00e0 codice efficiente con ottimizzazioni e coinvolgimento di istruzioni avanzate, e quando no). Per identificare il tipo di sistema di distribuzione della memoria e il sistema operativo, viene anche misurata la differenza nei tempi di allocazione della memoria per diverse strutture, da cui si pu\u00f2 evincere la dimensione dei blocchi di memoria. <\/p>\n<p>I parametri definiti durante l'esecuzione dello script vengono confrontati con valori di riferimento caratteristici di ambienti testati in precedenza. Durante il controllo, la tecnica sviluppata ha permesso di identificare esattamente 40 diversi ambienti di test, determinando le versioni dei browser utilizzati, il produttore della CPU, il sistema operativo in uso e il fatto che l'esecuzione avvenisse su hardware reale o su una macchina virtuale.<\/p>\n<p>Si segnala la possibilit\u00e0 di rilevare le estensioni del browser e persino le impostazioni specifiche delle estensioni, comprese quelle progettate per bloccare metodi di identificazione nascosta o l'attivit\u00e0 della modalit\u00e0 di navigazione privata. Nel contesto del metodo proposto, tali estensioni diventano un ulteriore fonte di dati per l'identificazione. Le estensioni vengono identificate attraverso la valutazione delle distorsioni dei parametri dell'ambiente originale apportate dalle estensioni.<\/p>\n<p>Tra i metodi di identificazione, si possono menzionare anche dati indiretti come <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=46046\">la risoluzione dello schermo<\/a><\/noindex>, l'elenco dei tipi MIME supportati, parametri specifici negli header (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47821\">HTTP\/2<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=42943\">HTTPS<\/a><\/noindex>), l'analisi dei <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=26635\">plugin e dei font<\/a><\/noindex>, la disponibilit\u00e0 di determinate Web API, specifiche per le schede grafiche <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=48736\">caratteristiche<\/a><\/noindex> le rendering tramite WebGL e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50176\">Canvas<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=47902\">manipolazioni<\/a><\/noindex> con CSS, l'analisi delle peculiarit\u00e0 nell'interazione con <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44027\">il mouse<\/a><\/noindex> e <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=42685\">la tastiera<\/a><\/noindex>.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50872\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0430\u0442\u0430\u043a MDS, NetSpectre \u0438 Throwhammer, \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0430 \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e \u043d\u043e\u0432\u043e\u0439 \u0442\u0435\u0445\u043d\u0438\u043a\u0435 \u0430\u043d\u0430\u043b\u0438\u0437\u0430 \u043f\u043e \u0441\u0442\u043e\u0440\u043e\u043d\u043d\u0438\u043c \u043a\u0430\u043d\u0430\u043b\u0430\u043c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0438\u0442\u044c \u0442\u043e\u0447\u043d\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0430, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u0443\u044e \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0443\u044e \u0441\u0438\u0441\u0442\u0435\u043c\u0443, \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u0443 CPU \u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0434\u043e\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0439 \u0434\u043b\u044f \u0431\u043e\u0440\u044c\u0431\u044b \u0441\u043e \u0441\u043a\u0440\u044b\u0442\u043e\u0439 \u0438\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u0435\u0439. \u0414\u043b\u044f \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u044b\u0445 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u0432 \u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0432 \u0431\u0440\u0430\u0443\u0437\u0435\u0440\u0435 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044f\u043c\u0438 JavaScript \u043a\u043e\u0434\u0430. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-35296","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0413\u0440\u0443\u043f\u043f\u0430 \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0438\u0437 \u0413\u0440\u0430\u0446\u0441\u043a\u043e\u0433\u043e \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u043e\u0433\u043e \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442\u0430 (\u0410\u0432\u0441\u0442\u0440\u0438\u044f), \u0440\u0430\u043d\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430\u044f 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