{"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\/ro\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd","title":{"rendered":"O vulnerabilitate \u00een hypervisorul VMM dezvoltat de proiectul OpenBSD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00cen hypervisorul livrat \u00een OpenBSD <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=45316\">VMM<\/a><\/noindex> a fost identificat\u0103 <noindex><a rel=\"nofollow\" href=\"https:\/\/marc.info\/?l=openbsd-tech&#038;m=158176939604512&#038;w=2\">vulnerabilitatea<\/a><\/noindex>, permit\u00e2nd, prin manipul\u0103ri de partea sistemului gazd\u0103, scrierea con\u021binutului zonelor de memorie ale nucleului mediului gazd\u0103. Problema este cauzat\u0103 de faptul c\u0103 o parte din adresele fizice ale sistemului gazd\u0103 (GPA, Guest Physical Address) sunt reflectate \u00een spa\u021biul de adresare virtual\u0103 al nucleului (KVA), dar nu se aplic\u0103 protec\u021bia \u00eempotriva scrierii \u00een zonele KVA marcate doar pentru citire. Din cauza absen\u021bei verific\u0103rilor necesare \u00een func\u021bia evmm_update_pvclock(), este posibil s\u0103 se transmit\u0103 adrese KVA ale sistemului gazd\u0103 \u00eentr-un apel pmap \u0219i s\u0103 se rescrie con\u021binutul memoriei nucleului.<\/p>\n<p>Complement: Dezvoltatorii OpenBSD au lansat <noindex><a rel=\"nofollow\" href=\"https:\/\/ftp.openbsd.org\/pub\/OpenBSD\/patches\/6.6\/common\/020_vmm_pvclock.patch.sig\">patch<\/a><\/noindex> pentru a corecta vulnerabilitatea.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Sursa: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52378\">opennet.ro<\/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 5.0.2.1 - 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\/ro\/blog\/uyazvimost-v-gipervizore-vmm-razvivaemom-proektom-openbsd\" \/>\n\t<meta name=\"generator\" content=\"All 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