{"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\/hu\/blog\/news\/10-uyazvimostej-v-gipervizore-xen","title":{"rendered":"10 sebezhet\u0151s\u00e9g a Xen hipervizorban","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\/\">Megjelentek<\/a><\/noindex> inform\u00e1ci\u00f3 10 sebezhet\u0151s\u00e9gr\u0151l a Xen hypervisorban, amelyek k\u00f6z\u00fcl \u00f6t (<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\u00e1lisan lehet\u0151v\u00e9 teszi a jelenlegi vend\u00e9gk\u00f6rnyezet hat\u00e1rainak \u00e1tl\u00e9p\u00e9s\u00e9t \u00e9s a jogosults\u00e1gok emel\u00e9s\u00e9t, egyik sebezhet\u0151s\u00e9g (CVE-2019-17347) lehet\u0151s\u00e9get ad nem jogosult folyamatoknak m\u00e1s felhaszn\u00e1l\u00f3k folyamatai felett kontrollt szerezni ugyanabban a vend\u00e9g rendszeren, a fennmarad\u00f3 n\u00e9gy (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) sebezhet\u0151s\u00e9g lehet\u0151v\u00e9 teszi a szolg\u00e1ltat\u00e1smegtagad\u00e1st (a host k\u00f6rnyezet \u00f6sszeoml\u00e1s\u00e1t). A probl\u00e9m\u00e1k orvosl\u00e1sra ker\u00fcltek a kiad\u00e1sokban <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/downloads\/\">Xen 4.12.1, 4.11.2 \u00e9s 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 lehet\u0151s\u00e9g a t\u00e1mad\u00f3 \u00e1ltal ir\u00e1ny\u00edtott vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pen val\u00f3 hozz\u00e1f\u00e9r\u00e9s megszerz\u00e9s\u00e9re a hypervisor szintj\u00e9n. A probl\u00e9ma csak az x86 rendszereken jelentkezik, \u00e9s megval\u00f3s\u00edthat\u00f3 olyan vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pekr\u0151l, amelyek paravirtualiz\u00e1ci\u00f3s (PV) \u00fczemm\u00f3dban m\u0171k\u00f6dnek, amikor \u00faj PCI-eszk\u00f6zt tov\u00e1bb\u00edtanak a fut\u00f3 vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pbe. HVM \u00e9s PVH \u00fczemm\u00f3dban m\u0171k\u00f6d\u0151 vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pekn\u00e9l a sebezhet\u0151s\u00e9g nem nyilv\u00e1nul meg;\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 mem\u00f3ria sziv\u00e1rg\u00e1s, amely potenci\u00e1lisan lehet\u0151v\u00e9 teszi a jogosults\u00e1gok emel\u00e9s\u00e9t vagy m\u00e1s vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pek adataihoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st.<br \/>\nA probl\u00e9ma csak 16 TB feletti RAM-mal rendelkez\u0151 64 bites rendszereken \u00e9s 168 GB-ot meghalad\u00f3 32 bites rendszereken jelentkezik.<br \/>\nA sebezhet\u0151s\u00e9g csak PV m\u00f3dban m\u0171k\u00f6d\u0151 vend\u00e9g rendszerekb\u0151l haszn\u00e1lhat\u00f3 ki (HVM \u00e9s PVH m\u00f3dban, libxl-en kereszt\u00fcl m\u0171k\u00f6dve a sebezhet\u0151s\u00e9g nem jelentkezik);<\/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 sebezhet\u0151s\u00e9g a PCID (Process Context Identifiers) haszn\u00e1latakor, amely a t\u00e1mad\u00e1sok elleni v\u00e9delem teljes\u00edtm\u00e9ny\u00e9nek jav\u00edt\u00e1s\u00e1t c\u00e9lozza;<br \/>\nMeltdown, lehet\u0151v\u00e9 teszi m\u00e1s vend\u00e9g rendszerek adataihoz val\u00f3 hozz\u00e1f\u00e9r\u00e9st \u00e9s potenci\u00e1lisan jogosults\u00e1gok emel\u00e9s\u00e9t. A sebezhet\u0151s\u00e9g csak PV m\u00f3dban m\u0171k\u00f6d\u0151 vend\u00e9g rendszerekb\u0151l alkalmazhat\u00f3 x86 rendszereken (a probl\u00e9ma nem jelentkezik HVM \u00e9s PVH m\u00f3dban, valamint olyan konfigur\u00e1ci\u00f3kban, ahol nincs akt\u00edv vend\u00e9g rendszer PCID-del (a PCID alap\u00e9rtelmez\u00e9s szerint aktiv\u00e1lva van));<\/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 a XENMEM_exchange hypercall megval\u00f3s\u00edt\u00e1s\u00e1ban l\u00e9v\u0151 probl\u00e9ma lehet\u0151v\u00e9 teszi a jogosults\u00e1gok emel\u00e9s\u00e9t olyan k\u00f6rnyezetekben, ahol csak egy vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9p tal\u00e1lhat\u00f3. A sebezhet\u0151s\u00e9g csak PV \u00fczemm\u00f3dban fut\u00f3 vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pekb\u0151l haszn\u00e1lhat\u00f3 ki (HVM \u00e9s PVH \u00fczemm\u00f3dban a sebezhet\u0151s\u00e9g nem jelentkezik);\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 a nem megfelel\u0151 mappol\u00e1s az IOMMU-ban lehet\u0151s\u00e9get ad arra, hogy a vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9p fizikai eszk\u00f6zehez val\u00f3 hozz\u00e1f\u00e9r\u00e9s eset\u00e9n a DMA-t haszn\u00e1lva m\u00f3dos\u00edtsa a saj\u00e1t mem\u00f3riaoldalt\u00e1bl\u00e1j\u00e1t, \u00e9s hozz\u00e1f\u00e9rjen a gazda szintj\u00e9n. A sebezhet\u0151s\u00e9g csak PV \u00fczemm\u00f3dban fut\u00f3 vend\u00e9gsz\u00e1m\u00edt\u00f3g\u00e9pekn\u00e9l jelentkezik, ha jogosults\u00e1gokkal rendelkezik PCI-eszk\u00f6z\u00f6k tov\u00e1bb\u00edt\u00e1s\u00e1ra.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <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 in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 (\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link 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