{"id":39427,"date":"2019-10-31T22:32:37","date_gmt":"2019-10-31T19:32:37","guid":{"rendered":"https:\/\/prohoster.info\/blog\/10-uyazvimostej-v-gipervizore-xen\/"},"modified":"2019-10-31T22:32:37","modified_gmt":"2019-10-31T19:32:37","slug":"10-uyazvimostej-v-gipervizore-xen","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/10-uyazvimostej-v-gipervizore-xen","title":{"rendered":"10 zranitelnost\u00ed v hypervizoru Xen","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/\">Byly zve\u0159ejn\u011bny<\/a><\/noindex> informace o 10 zranitelnostech v hypervizoru Xen, z nich\u017e p\u011bt (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/6\">CVE-2019-17341<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/2\">CVE-2019-17342<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/1\">CVE-2019-17340<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/5\">CVE-2019-17346<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/10\">CVE-2019-17343<\/a><\/noindex>) potenci\u00e1ln\u011b umo\u017e\u0148uj\u00ed p\u0159ekro\u010dit aktu\u00e1ln\u00ed prost\u0159ed\u00ed hosta a zv\u00fd\u0161it si pr\u00e1va; jedna zranitelnost (CVE-2019-17347) umo\u017e\u0148uje nezprivilegovan\u00e9mu procesu z\u00edskat kontrolu nad procesy jin\u00fdch u\u017eivatel\u016f ve stejn\u00e9m hostitelsk\u00e9m syst\u00e9mu, zb\u00fdvaj\u00edc\u00ed \u010dty\u0159i (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) zranitelnosti mohou zp\u016fsobit odm\u00edtnut\u00ed slu\u017eby (zhroucen\u00ed hostitelsk\u00e9ho prost\u0159ed\u00ed). Probl\u00e9my byly vy\u0159e\u0161eny v verz\u00edch <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/downloads\/\">Xen 4.12.1, 4.11.2 a 4.10.4<\/a><\/noindex>.<\/p>\n<ul>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/6\">CVE-2019-17341<\/a><\/noindex> \u2014 mo\u017enost z\u00edskat p\u0159\u00edstup na \u00farovni hypervizora z hostitelsk\u00e9ho syst\u00e9mu pod kontrolou \u00fato\u010dn\u00edka. Probl\u00e9m se projevuje pouze na syst\u00e9mech x86 a m\u016f\u017ee b\u00fdt proveden z hostitelsk\u00fdch syst\u00e9m\u016f b\u011b\u017e\u00edc\u00edch v re\u017eimu paravirtualizace (PV) p\u0159i prohozen\u00ed nov\u00e9ho PCI za\u0159\u00edzen\u00ed do b\u011b\u017e\u00edc\u00edho hostitelsk\u00e9ho syst\u00e9mu. U hostitelsk\u00fdch syst\u00e9m\u016f b\u011b\u017e\u00edc\u00edch v re\u017eimech HVM a PVH se zranitelnost neprojevuje;\n<li class=\"l\">  <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/1\">CVE-2019-17340<\/a><\/noindex> \u2014 \u00fanik pam\u011bti, potenci\u00e1ln\u011b umo\u017e\u0148uj\u00edc\u00ed zv\u00fd\u0161it sv\u00e9 privilegium nebo z\u00edskat p\u0159\u00edstup k dat\u016fm jin\u00fdch hostitelsk\u00fdch syst\u00e9m\u016f.<br \/>\nProbl\u00e9m se projevuje pouze na hostitel\u00edch s v\u00edce ne\u017e 16 TB RAM v 64bitov\u00fdch syst\u00e9mech a 168 GB v 32bitov\u00fdch.<br \/>\nZranitelnost m\u016f\u017ee b\u00fdt vyu\u017eita pouze z hostitelsk\u00fdch syst\u00e9m\u016f v re\u017eimu PV (v re\u017eimech HVM a PVH p\u0159i pr\u00e1ci p\u0159es libxl se zranitelnost neprojevuje);<\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/5\">CVE-2019-17346<\/a><\/noindex> \u2014 zranitelnost p\u0159i pou\u017eit\u00ed PCID (Identifik\u00e1tory kontextu procesu) pro zv\u00fd\u0161en\u00ed v\u00fdkonu ochrany proti \u00fatok\u016fm.<br \/>\nMeltdown, umo\u017e\u0148uje z\u00edskat p\u0159\u00edstup k dat\u016fm jin\u00fdch hostitelsk\u00fdch syst\u00e9m\u016f a potenci\u00e1ln\u011b zv\u00fd\u0161it sv\u00e9 pr\u00e1va. Zranitelnost m\u016f\u017ee b\u00fdt vyu\u017eita pouze z hostitelsk\u00fdch syst\u00e9m\u016f v re\u017eimu PV na syst\u00e9mech x86 (probl\u00e9m se neprojevuje v re\u017eimech HVM a PVH, ani v konfigurac\u00edch, kde nejsou hostitelsk\u00e9 syst\u00e9my s povolen\u00fdm PCID (PCID je ve v\u00fdchoz\u00edm nastaven\u00ed aktivov\u00e1n));<\/p>\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/2\">CVE-2019-17342<\/a><\/noindex> \u2014 probl\u00e9m v implementaci hypervol\u00e1n\u00ed XENMEM_exchange umo\u017e\u0148uje zv\u00fd\u0161it sv\u00e9 privilegium v prost\u0159ed\u00edch s pouze jedn\u00edm hostitelsk\u00fdm syst\u00e9mem. Zranitelnost m\u016f\u017ee b\u00fdt zneu\u017eita pouze z hostitelsk\u00fdch syst\u00e9m\u016f v re\u017eimu PV (ve verz\u00edch HVM a PVH se zranitelnost neprojevuje);\n<li class=\"l\"> <noindex><a rel=\"nofollow\" href=\"https:\/\/www.openwall.com\/lists\/oss-security\/2019\/10\/25\/10\">CVE-2019-17343<\/a><\/noindex> \u2014 nespr\u00e1vn\u00e9 mapov\u00e1n\u00ed v IOMMU umo\u017e\u0148uje p\u0159i p\u0159\u00edstupu z hostitelsk\u00e9ho syst\u00e9mu k fyzick\u00e9mu za\u0159\u00edzen\u00ed pou\u017e\u00edt DMA ke zm\u011bn\u011b vlastn\u00ed tabulky str\u00e1nek pam\u011bti a z\u00edskat p\u0159\u00edstup na \u00farovni hostitele. Zranitelnost se projevuje pouze v hostitelsk\u00fdch syst\u00e9mech v re\u017eimu PV p\u0159i existenci pr\u00e1v pro prohozen\u00ed PCI za\u0159\u00edzen\u00ed.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51764\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u044b \u0441\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e 10 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044f\u0445 \u0432 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 Xen, \u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u044f\u0442\u044c (CVE-2019-17341, CVE-2019-17342, CVE-2019-17340, CVE-2019-17346, CVE-2019-17343) \u043f\u043e\u0442\u0435\u043d\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u0439\u0442\u0438 \u0437\u0430 \u043f\u0440\u0435\u0434\u0435\u043b\u044b \u0442\u0435\u043a\u0443\u0449\u0435\u0433\u043e \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0433\u043e \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f \u0438 \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0441\u0432\u043e\u0438 \u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0438, \u043e\u0434\u043d\u0430 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2019-17347) \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u043d\u0435\u043f\u0440\u0438\u0432\u0438\u043b\u0435\u0433\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u043c\u0443 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0443 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u044c \u043d\u0430\u0434 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0430\u043c\u0438 \u0434\u0440\u0443\u0433\u0438\u0445 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u0435\u0439 \u0432 \u0442\u043e\u0439 \u0436\u0435 \u0433\u043e\u0441\u0442\u0435\u0432\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u043e\u0441\u0442\u0430\u0432\u0448\u0438\u0435\u0441\u044f \u0447\u0435\u0442\u044b\u0440\u0435 (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c [&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":[702],"tags":[],"class_list":["post-39427","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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