{"id":82556,"date":"2020-05-22T19:41:55","date_gmt":"2020-05-22T17:41:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc"},"modified":"2020-05-22T19:41:55","modified_gmt":"2020-05-22T17:41:55","slug":"kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc","title":{"rendered":"Vulnerabilit\u00e0 critica nell'implementazione della funzione memcpy per ARMv7 all'interno di Glibc.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I ricercatori della sicurezza di Cisco hanno rivelato<\/a><\/noindex> dettagli vulnerabilit\u00e0<\/a><\/noindex> (CVE-2020-6096<\/a><\/noindex>) nell'implementazione fornita nella funzione memcpy() di Glibc per la piattaforma ARMv7 a 32 bit. Il problema \u00e8 causato da una gestione errata dei valori negativi del parametro che determina la dimensione dell'area da copiare, a causa dell'uso di ottimizzazioni in assembly che manipolano interi firmati a 32 bit. La chiamata a memcpy() su sistemi ARMv7 con una dimensione negativa provoca confronti errati e scritture al di fuori dei limiti del buffer specificato.<\/p>\n

La vulnerabilit\u00e0 pu\u00f2 essere sfruttata per eseguire codice in situazioni in cui l'attaccante riesce a generare un valore negativo per la variabile attraverso cui viene passato il dimensionamento dei dati copiati (ad esempio, un valore negativo si verifica quando vengono trasferiti pi\u00f9 di 2 GB di dati, ma per superare il limite del buffer \u00e8 necessario trasferire almeno 4 GB). La funzione memcpy() \u00e8 ampiamente utilizzata nelle applicazioni, e i processori ARMv7 sono comuni nei sistemic automobilistici, mobili, industriali, di consumo, di comunicazione e negli apparecchi integrati, che possono diventare obiettivi di attacchi tramite Bluetooth, HD Radio\/DAB, USB, CAN bus, Wi-Fi e altre fonti di dati esterne (ad esempio, possono essere attaccati servizi e applicazioni disponibili in rete che accettano input senza limitazioni sulle dimensioni).<\/p>\n

Come esempio, viene presentata la creazione di un exploit funzionante per attaccare il server http integrato nei sistemi informatici delle automobili, accessibile tramite la rete Wi-Fi dell'auto. Un attaccante esterno pu\u00f2 sfruttare una vulnerabilit\u00e0 in memcpy in questo server inviando una richiesta GET di dimensioni molto grandi e ottenere accesso root al sistema.<\/p>\n

\"Vulnerabilit\u00e0<\/a><\/noindex><\/center><\/p>\n

Sui sistemi x86 a 32 bit, il problema non si manifesta, poich\u00e9 l'implementazione di memcpy per questa architettura interpreta correttamente la variabile di dimensione come un valore intero senza segno di tipo size_t (nella scrittura in assembly. implementazioni<\/a><\/noindex> per ARMv7 al posto di size_t \u00e8 trattata come un intero firmato). La correzione \u00e8 attualmente disponibile come patch<\/a><\/noindex>, che far\u00e0 parte dell'aggiornamento di agosto di Glibc 2.32.
\nLa correzione consiste nella sostituzione dell'uso di istruzioni in assembly che operano su operandi firmati (bge e blt) con analoghi senza segno (blo e bhs). <\/p>\n

Il problema non \u00e8 ancora stato risolto in Debian 9 e 10<\/a><\/noindex> (in Debian 8 non si manifesta), Fedora<\/a><\/noindex>, Ubuntu<\/a><\/noindex>, OpenEmbedded, Tizen (utilizza glibc). RHEL<\/a><\/noindex> e SUSE<\/a><\/noindex> il problema non si applica poich\u00e9 non supportano i sistemi ARMv7 a 32 bit. Android non \u00e8 vulnerabile poich\u00e9 utilizza la propria implementazione di libc (Bionic). In OpenWRT<\/a><\/noindex> di default, nella maggior parte delle build viene utilizzato Musl, ma \u00e8 disponibile anche glibc nel repository.<\/p>\n

<\/a><\/noindex><\/p>\n

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

\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Cisco \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2020-6096) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0432 Glibc \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memcpy() \u0434\u043b\u044f 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b ARMv7. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u043e\u0442\u0440\u0438\u0446\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u0445 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u0430, \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440 \u043a\u043e\u043f\u0438\u0440\u0443\u0435\u043c\u043e\u0439 \u043e\u0431\u043b\u0430\u0441\u0442\u0438, \u0438\u0437-\u0437\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0430\u0441\u0441\u0435\u043c\u0431\u043b\u0435\u0440\u043d\u044b\u0445 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439, \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u0438\u0440\u0443\u044e\u0449\u0438\u0445 \u0437\u043d\u0430\u043a\u043e\u0432\u044b\u043c\u0438 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u044b\u043c\u0438 \u0446\u0435\u043b\u044b\u043c\u0438 \u0447\u0438\u0441\u043b\u0430\u043c\u0438. \u0412\u044b\u0437\u043e\u0432 memcpy() \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 ARMv7 \u0441 \u043e\u0442\u0440\u0438\u0446\u0430\u0442\u0435\u043b\u044c\u043d\u044b\u043c \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u043c \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e\u043c\u0443 \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0439 \u0438 \u0437\u0430\u043f\u0438\u0441\u0438 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":82557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-82556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Vulnerabilit\u00e0 critica nell'implementazione della funzione memcpy per ARMv7 di Glibc | ProHoster","description":"I ricercatori di sicurezza di Cisco hanno rivelato dettagli su una vulnerabilit\u00e0 (CVE-2020-6096) nell'implementazione della funzione memcpy() fornita in Glibc per la piattaforma ARMv7 a 32 bit. Il problema \u00e8 causato da una gestione errata dei valori negativi del parametro che determina la dimensione dell'area copiata, dovuta all'uso di ottimizzazioni in assembly che manipolano numeri interi a 32 bit con segno. La chiamata a memcpy() su sistemi ARMv7 con dimensione negativa porta a un confronto errato dei valori e a scritture","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/kriticheskaya-uyazvimost-v-realizaczii-funkczii-memcpy-dlya-armv7-iz-sostava-glibc","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memcpy \u0434\u043b\u044f ARMv7 \u0438\u0437 \u0441\u043e\u0441\u0442\u0430\u0432\u0430 Glibc | ProHoster","og:description":"\u0418\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u0438 \u0431\u0435\u0437\u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Cisco \u0440\u0430\u0441\u043a\u0440\u044b\u043b\u0438 \u0434\u0435\u0442\u0430\u043b\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 (CVE-2020-6096) \u0432 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0438 \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u0439 \u0432 Glibc \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memcpy() \u0434\u043b\u044f 32-\u0440\u0430\u0437\u0440\u044f\u0434\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b ARMv7. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 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