{"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\/news\/arm-prohudilas-obnaruzhilas-isklyuchitelnaya-uyazvimost-dlya-ataki-na-spekulyativnye-vychisleniya","title":{"rendered":"ARM ha subito una rottura: \u00e8 stata scoperta una vulnerabilit\u00e0 eccezionale per attacchi su calcoli speculativi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Per i processori su un ampio spettro di architetture Armv8-A (Cortex-A) \u00e8 stata trovata<\/a><\/noindex> una vulnerabilit\u00e0 unica per attacchi tramite canali laterali usando algoritmi di calcolo speculativi. Questo \u00e8 stato comunicato da ARM stessa, che ha fornito patch e guide per mitigare la vulnerabilit\u00e0 trovata. Il pericolo non \u00e8 molto elevato, ma non pu\u00f2 essere trascurato, poich\u00e9 i processori basati su architettura ARM sono ovunque, rendendo il rischio di fughe inimmaginabile nelle 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 delle forme della vulnerabilit\u00e0 Spectre, di cui (insieme alla vulnerabilit\u00e0 Meltdown) si \u00e8 parlato ampiamente a gennaio 2018. In altre parole, si tratta di una vulnerabilit\u00e0 classica nei meccanismi di calcolo speculativo con attacchi attraverso canali laterali.<\/p>\n

I calcoli speculativi richiedono di elaborare dati in anticipo su diversi possibili rami, anche se successivamente potrebbero 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 performanti e un rischio di fuga di dati.<\/p>\n

L'attacco Straight-Line Speculation sui processori con architettura ARM costringe il processore a passare ogni volta, dopo una modifica nel flusso di istruzioni, all'esecuzione di istruzioni trovate direttamente in memoria, anzich\u00e9 seguire le istruzioni nel nuovo flusso di comandi. \u00c8 evidente che questo non \u00e8 il miglior scenario per la scelta delle istruzioni da eseguire, che un malintenzionato pu\u00f2 sfruttare.<\/p>\n

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

A onore di ARM, non solo ha rilasciato una guida per gli sviluppatori che aiuter\u00e0 ad evitare il rischio di fuga attraverso l'attacco di 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

Inoltre, l'azienda ha dichiarato che l'applicazione delle patch non influenzer\u00e0 le prestazioni delle piattaforme ARM, come \u00e8 successo sulle piattaforme compatibili x86 Intel con il blocco delle vulnerabilit\u00e0 Spectre e Meltdown. Tuttavia, questo lo sapremo attraverso fonti di terze parti, il che fornir\u00e0 un quadro oggettivo riguardo la nuova vulnerabilit\u00e0.<\/p>\n

<\/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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