{"id":84985,"date":"2020-06-12T13:42:15","date_gmt":"2020-06-12T11:42:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya"},"modified":"2020-06-12T13:42:15","modified_gmt":"2020-06-12T11:42:15","slug":"arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","title":{"rendered":"ARM ha subito una vulnerabilit\u00e0 critica: \u00e8 stata scoperta una falla eccezionale per attacchi a calcoli speculativi.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Per i processori su un'ampia gamma di architetture Armv8-A (Cortex-A) \u00e8 stata trovata<\/a><\/noindex> una vulnerabilit\u00e0 unica per attacchi tramite canali laterali utilizzando algoritmi di calcolo speculativo. ARM stessa ha comunicato e fornito patch e linee guida per mitigare la vulnerabilit\u00e0 individuata. Il pericolo non \u00e8 cos\u00ec grande, ma non si pu\u00f2 trascurare, poich\u00e9 i processori basati su architettura ARM sono ovunque, rendendo il rischio di perdite inimmaginabile per le sue conseguenze.<\/p>\n

\"ARM<\/p>\n

La vulnerabilit\u00e0 trovata dagli esperti di Google nell'architettura ARM ha ricevuto il nome in codice Straight-Line Speculation (SLS) e la designazione ufficiale CVE-2020-13844. Secondo ARM, la vulnerabilit\u00e0 SLS \u00e8 una forma della vulnerabilit\u00e0 Spectre, di cui (insieme alla vulnerabilit\u00e0 Meltdown) si \u00e8 parlato ampliamente a gennaio 2018. In altre parole, \u00e8 una vulnerabilit\u00e0 classica nei meccanismi di calcolo speculativo con attacco tramite canali laterali.<\/p>\n

I calcoli speculativi richiedono di elaborare dati in anticipo su pi\u00f9 possibili rami, sebbene in seguito possano essere scartati come non necessari. Gli attacchi tramite canali laterali consentono di rubare tali dati intermedi prima della loro completa eliminazione. Di conseguenza, abbiamo processori ad alte prestazioni e il rischio di perdita di dati.<\/p>\n

L'attacco Straight-Line Speculation sui processori con architettura ARM costringe il processore, ogni volta che ci sono cambiamenti nel flusso di istruzioni, a eseguire istruzioni trovate direttamente in memoria, invece di seguire le istruzioni nel nuovo flusso di comandi. Ovviamente, questo non \u00e8 il miglior scenario per la selezione delle istruzioni da eseguire, di cui pu\u00f2 approfittare un aggressore.<\/p>\n

<\/center><\/p>\n

A onore di ARM, ha rilasciato non solo una guida per gli sviluppatori che aiuter\u00e0 a evitare il rischio di perdite tramite attacco alla Straight-Line Speculation, ma ha anche fornito patch per i principali sistemi operativi, come FreeBSD, OpenBSD, Trusted Firmware-A e OP-TEE e ha rilasciato patch per i compilatori GCC e LLVM.<\/p>\n

L'azienda ha anche affermato che l'applicazione delle patch non influenzer\u00e0 le prestazioni delle piattaforme ARM, come invece \u00e8 accaduto sulle piattaforme Intel compatibili x86 con le mitigazioni delle vulnerabilit\u00e0 Spectre e Meltdown. Tuttavia, lo scopriremo tramite fonti esterne, che forniranno un quadro obiettivo della nuova vulnerabilit\u00e0.<\/p>\n

<\/p>\n

<\/center><\/p>\n

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Fonte: 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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