{"id":100600,"date":"2021-06-25T16:22:54","date_gmt":"2021-06-25T14:22:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimosti-v-ustrojstvah-dell-pozvolyayushhie-sovershit-mitm-ataku-dlya-podmeny-proshivki"},"modified":"2021-06-25T16:22:54","modified_gmt":"2021-06-25T14:22:55","slug":"uyazvimosti-v-ustrojstvah-dell-pozvolyayushhie-sovershit-mitm-ataku-dlya-podmeny-proshivki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/uyazvimosti-v-ustrojstvah-dell-pozvolyayushhie-sovershit-mitm-ataku-dlya-podmeny-proshivki","title":{"rendered":"Vulnerabilit\u00e0 nei dispositivi Dell che consentono un attacco MITM per la sostituzione del firmware","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Sono state identificate vulnerabilit\u00e0 nelle tecnologie di ripristino remoto e aggiornamento del firmware (BIOSConnect e HTTPS Boot) promosse da Dell, che consentono la sostituzione degli aggiornamenti del firmware BIOS\/UEFI installati e l'esecuzione remota di codice a livello di firmware. Il codice eseguito pu\u00f2 alterare lo stato iniziale del sistema operativo e pu\u00f2 essere utilizzato per aggirare i meccanismi di protezione applicati. Le vulnerabilit\u00e0 interessano 129 modelli di diversi notebook, tablet e PC Dell, compresi quelli protetti tramite le tecnologie UEFI Secure Boot e Dell Secured-core. <\/p>\n

La vulnerabilit\u00e0 CVE-2021-21571 \u00e8 causata da un controllo del certificato non corretto di dominio<\/a> su dell.com nello stack HTTPS utilizzato nei firmware UEFI\/BIOS che supportano le tecnologie Dell BIOSConnect e Dell HTTPS Boot. Questo problema consente a un attaccante esterno non autenticato di eseguire un attacco MITM, spacciandosi per Dell.com e sostituendo i dati trasmessi. Quando il BIOS si connette al server Dell in BIOSConnect, viene accettato qualsiasi un certificato TLS<\/a>, che coprono un gruppo di sottodomini tramite un wildcard. <\/p>\n

Le vulnerabilit\u00e0 CVE-2021-21572, CVE-2021-21573 e CVE-2021-21574 sono legate a buffer overflow nel codice Dell BIOSConnect e consentono a un amministratore locale o a un attaccante remoto che ha sfruttato la vulnerabilit\u00e0 CVE-2021-2157 di eseguire il proprio codice a livello di firmware e aggirare i vincoli UEFI. Le vulnerabilit\u00e0 CVE-2021-21573 e CVE-2021-21574 sono presenti sul lato dell'infrastruttura server di Dell e sono gi\u00e0 state risolte. Le vulnerabilit\u00e0 CVE-2021-21571 e CVE-2021-21572 sono presenti sul lato utente e richiedono un aggiornamento del firmware. Come misura alternativa di protezione, \u00e8 possibile disattivare nel BIOS il supporto per la tecnologia BIOSConnect.

\"Vulnerabilit\u00e0<\/center>
\n
Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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