CVSS: 6.2EPSS: 0%CPEs: 14EXPL: 0CVE-2016-6259
https://notcve.org/view.php?id=CVE-2016-6259
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check. Xen 4.5.x hasta la version 4.7.x no implementa listas blancas Supervisor Mode Access Prevencion (SMAP) en excepción 32 bits y entrega de eventos, lo que permite a kernels 32-bit PV locales del SO invitado provocar una denegación de servicio (hipervisor y caida VM) mediante la activación de un control de seguridad. • http://support.citrix.com/article/CTX214954 http://www.securityfocus.com/bid/92130 http://www.securitytracker.com/id/1036447 http://xenbits.xen.org/xsa/advisory-183.html http://xenbits.xen.org/xsa/xsa183-4.6.patch http://xenbits.xen.org/xsa/xsa183-unstable.patch • CWE-20: Improper Input Validation •
CVSS: 8.8EPSS: 0%CPEs: 33EXPL: 0CVE-2016-6258
https://notcve.org/view.php?id=CVE-2016-6258
The PV pagetable code in arch/x86/mm.c in Xen 4.7.x and earlier allows local 32-bit PV guest OS administrators to gain host OS privileges by leveraging fast-paths for updating pagetable entries. El código de tabla de página PV en arch/x86/mm.c en Xen 4.7.x y versiones anteriores permite a administradores 32-bit PV locales del SO invitado obtener privilegios de administrador del SO mediante el aprovechamiento de fast_paths para la actualización de las entradas de la tabla de página. • http://support.citrix.com/article/CTX214954 http://www.debian.org/security/2016/dsa-3633 http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html http://www.securityfocus.com/bid/92131 http://www.securitytracker.com/id/1036446 http://xenbits.xen.org/xsa/advisory-182.html http://xenbits.xen.org/xsa/xsa182-4.5.patch http://xenbits.xen.org/xsa/xsa182-4.6.patch http://xenbits.xen.org/xsa/xsa182-unstable.patch https://security.gentoo.org/glsa/201611- • CWE-284: Improper Access Control •
CVSS: 5.2EPSS: 0%CPEs: 33EXPL: 0CVE-2015-5307 – virt: guest to host DoS by triggering an infinite loop in microcode via #AC exception
https://notcve.org/view.php?id=CVE-2015-5307
The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows guest OS users to cause a denial of service (host OS panic or hang) by triggering many #AC (aka Alignment Check) exceptions, related to svm.c and vmx.c. El subsistema KVM en el kernel Linux hasta la versión 4.2.6, y Xen 4.3.x hasta la versión 4.6.x permite a usuarios del SO invitados causar una denegación de servicio (panic en el host del SO o cuelgue) desencandenando muchas excepciones #AC (también conocidas como Alignment Check), relacionadas con svm.c y vmx.c. It was found that the x86 ISA (Instruction Set Architecture) is prone to a denial of service attack inside a virtualized environment in the form of an infinite loop in the microcode due to the way (sequential) delivering of benign exceptions such as #AC (alignment check exception) is handled. A privileged user inside a guest could use this flaw to create denial of service conditions on the host kernel. • http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54a20552e1eae07aa240fa370a0293e006b5faed http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172187.html http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172300.html http://lists.fedoraproject.org/pipermail/package-announce/2015-November/172435.html http://lists.opensuse.org/opensuse-security-announce/2015-11/msg00035.html http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00005.html http:/&# • CWE-399: Resource Management Errors CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop') •