{"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\/nl\/blog\/news\/10-uyazvimostej-v-gipervizore-xen","title":{"rendered":"10 kwetsbaarheden in de hypervisor 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\/\">Gepubliceerd<\/a><\/noindex> informatie over 10 kwetsbaarheden in de Xen hypervisor, waarvan vijf (<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>) potentieel in staat zijn om de huidige gastomgeving te doorbreken en hun privileges te verhogen, \u00e9\u00e9n kwetsbaarheid (CVE-2019-17347) stelt een niet-privileged proces in staat om controle te verkrijgen over de processen van andere gebruikers in hetzelfde gast systeem, de overige vier (CVE-2019-17344, CVE-2019-17345, CVE-2019-17348, CVE-2019-17351) kwetsbaarheden kunnen leiden tot een denial of service (crash van de hostomgeving). Problemen zijn opgelost in de releases <noindex><a rel=\"nofollow\" href=\"https:\/\/xenproject.org\/downloads\/\">Xen 4.12.1, 4.11.2 en 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 de mogelijkheid voor een aanvaller om via het gastensysteem toegang te krijgen op hypervisor-niveau. Het probleem doet zich alleen voor op x86-systemen en kan worden uitgevoerd vanuit gastensystemen die in paravirtualisatie (PV) modus draaien, wanneer een nieuw PCI-apparaat aan een actief gastensysteem wordt doorgegeven. In gastensystemen die draaien in HVM- en PVH-modus komt de kwetsbaarheid niet voor;\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 een geheugendiefstal die potentieel de mogelijkheid biedt om privileges te verhogen of toegang te krijgen tot de gegevens van andere gastensystemen.<br \/>\nHet probleem manifesteert zich alleen op hosts met meer dan 16 TB RAM in 64-bits systemen en 168 GB in 32-bits.<br \/>\nDe kwetsbaarheid kan alleen worden uitgebuit vanuit gast systemen in PV-modus (in HVM- en PVH-modi bij het werken via libxl manifesteert de kwetsbaarheid zich niet);<\/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 een kwetsbaarheid bij het gebruik van PCID (Process Context Identifiers) om de prestaties van de bescherming tegen aanvallen te verbeteren<br \/>\nMeltdown, stelt toegang tot gegevens van andere gast systemen mogelijk en potentieel de verhoging van zijn privileges. De kwetsbaarheid kan alleen worden uitgebuit vanuit gast systemen in PV-modus op x86-systemen (het probleem manifesteert zich niet in HVM- en PVH-modi, alsook niet in configuraties zonder gast systemen met ingeschakelde PCID (PCID is standaard ingeschakeld));<\/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 een probleem in de implementatie van de hypercall XENMEM_exchange stelt een aanvaller in staat om zijn privileges te verhogen in omgevingen met slechts \u00e9\u00e9n gastensysteem. De kwetsbaarheid kan alleen worden misbruikt vanuit gastensystemen in PV-modus (in de HVM- en PVH-modus komt de kwetsbaarheid niet voor);\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 een onjuiste mapping in de IOMMU maakt het mogelijk, mits er toegang is vanuit het gastensysteem tot het fysieke apparaat, om DMA te gebruiken om de eigen paginatabel te wijzigen en toegang te krijgen op hostniveau. De kwetsbaarheid doet zich alleen voor in gastensystemen in PV-modus wanneer er rechten zijn om PCI-apparaten door te geven.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <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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