{"id":52319,"date":"2020-02-18T08:41:57","date_gmt":"2020-02-18T05:41:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd"},"modified":"2020-02-18T08:41:57","modified_gmt":"2020-02-18T05:41:57","slug":"uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd","title":{"rendered":"Vulnerabilit\u00e0 nel hypervisor VMM, sviluppato dal progetto OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Nel hypervisor fornito in OpenBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45316\">VMM<\/a><\/noindex> identificata <noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=openbsd-tech&#038;m=158176939604512&#038;w=2\">vulnerabilit\u00e0<\/a><\/noindex>, che consente attraverso manipolazioni sul lato del sistema ospite di sovrascrivere il contenuto delle aree di memoria del kernel dell'ambiente host. Il problema \u00e8 causato dal fatto che parte degli indirizzi fisici del sistema ospite (GPA, Guest Physical Address) \u00e8 riflessa nello spazio degli indirizzi virtuali del kernel (KVA), ma non viene applicata alcuna protezione in scrittura nelle aree di KVA contrassegnate solo per la lettura. A causa della mancanza di controlli necessari nella funzione evmm_update_pvclock() \u00e8 possibile ottenere la trasmissione degli indirizzi KVA del sistema host nella chiamata a pmap e sovrascrivere il contenuto della memoria del kernel.<\/p>\n<p>Aggiornamento: Gli sviluppatori di OpenBSD hanno rilasciato <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.6\/common\/020_vmm_pvclock.patch.sig\">patch<\/a><\/noindex> per correggere la vulnerabilit\u00e0.<\/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=52378\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 OpenBSD \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 VMM \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u0447\u0435\u0440\u0435\u0437 \u043c\u0430\u043d\u0438\u043f\u0443\u043b\u044f\u0446\u0438\u0438 \u043d\u0430 \u0441\u0442\u043e\u0440\u043e\u043d\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043f\u0435\u0440\u0435\u0437\u0430\u043f\u0438\u0441\u0438 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u043e\u0431\u043b\u0430\u0441\u0442\u0435\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u044f\u0434\u0440\u0430 host-\u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e \u0447\u0430\u0441\u0442\u044c \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0430\u0434\u0440\u0435\u0441\u043e\u0432 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b (GPA, Guest Physical Address) \u043e\u0442\u0440\u0430\u0436\u0435\u043d\u0430 \u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0435 \u0430\u0434\u0440\u0435\u0441\u043d\u043e\u0435 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u043e \u044f\u0434\u0440\u0430 (KVA), \u043d\u043e \u0434\u043b\u044f GPA \u043d\u0435 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u0437\u0430\u0449\u0438\u0442\u0430 \u043e\u0442 \u0437\u0430\u043f\u0438\u0441\u0438 \u0432 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 KVA, \u043f\u043e\u043c\u0435\u0447\u0435\u043d\u043d\u044b\u0435 \u0442\u043e\u043b\u044c\u043a\u043e [&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":[],"tags":[],"class_list":["post-52319","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u043e\u043c \u0432 OpenBSD \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 VMM \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd\" \/>\n\t<meta name=\"generator\" content=\"All 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