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CVE-2012-3495

Status Candidate

Overview

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.

Related Files

Gentoo Linux Security Advisory 201604-03
Posted Apr 6, 2016
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201604-3 - Multiple vulnerabilities have been found in Xen, the worst of which cause a Denial of Service. Versions less than 4.6.0-r9 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2012-3494, CVE-2012-3495, CVE-2012-3496, CVE-2012-3497, CVE-2012-3498, CVE-2012-3515, CVE-2012-4411, CVE-2012-4535, CVE-2012-4536, CVE-2012-4537, CVE-2012-4538, CVE-2012-4539, CVE-2012-6030, CVE-2012-6031, CVE-2012-6032, CVE-2012-6033, CVE-2012-6034, CVE-2012-6035, CVE-2012-6036, CVE-2015-2151, CVE-2015-3209, CVE-2015-3259, CVE-2015-3340, CVE-2015-3456, CVE-2015-4103, CVE-2015-4104, CVE-2015-4105, CVE-2015-4106
SHA-256 | a7e9bd9d6342dd146c7a64ee40be706e83549d090ba7149e7ac964a6280a8109
Technical Information On Vulnerabilities Of Hypercall Handlers
Posted Sep 23, 2014
Authored by Samuel Kounev, Bryan D. Payne, Aleksandar Milenkoski, Nuno Antunes, Marco Vieira | Site research.spec.org

Modern virtualized service infrastructures expose attack vectors that enable attacks of high severity, such as attacks targeting hypervisors. A malicious user of a guest VM (virtual machine) may execute an attack against the underlying hypervisor via hypercalls, which are software traps from a kernel of a fully or partially paravirtualized guest VM to the hypervisor. The exploitation of a vulnerability of a hypercall handler may have severe consequences such as altering hypervisor's memory, which may result in the execution of malicious code with hypervisor privilege. Despite the importance of vulnerabilities of hypercall handlers, there is not much publicly available information on them. This significantly hinders advances towards securing hypercall interfaces. In this work, the researchers provide in-depth technical information on publicly disclosed vulnerabilities of hypercall handlers. Our vulnerability analysis is based on reverse engineering the released patches fixing the considered vulnerabilities. For each analyzed vulnerability, they provide background information essential for understanding the vulnerability, and information on the vulnerable hypercall handler and the error causing the vulnerability. The researchers also show how the vulnerability can be triggered and discuss the state of the targeted hypervisor after the vulnerability has been triggered.

tags | paper, kernel, vulnerability
advisories | CVE-2012-3494, CVE-2012-3495, CVE-2012-3496, CVE-2012-4539, CVE-2012-5510, CVE-2012-5513, CVE-2012-5525, CVE-2013-1964
SHA-256 | 7d90e4303005df5faec215e49bc919db7d1f13c6388d0b7871bb45c646e2e92a
Gentoo Linux Security Advisory 201309-24
Posted Sep 27, 2013
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201309-24 - Multiple vulnerabilities have been found in Xen, allowing attackers on a Xen Virtual Machine to execute arbitrary code, cause Denial of Service, or gain access to data on the host. Versions less than 4.2.2-r1 are affected.

tags | advisory, denial of service, arbitrary, vulnerability
systems | linux, gentoo
advisories | CVE-2011-2901, CVE-2011-3262, CVE-2011-3262, CVE-2012-0217, CVE-2012-0218, CVE-2012-2934, CVE-2012-3432, CVE-2012-3433, CVE-2012-3494, CVE-2012-3495, CVE-2012-3496, CVE-2012-3497, CVE-2012-3498, CVE-2012-3515, CVE-2012-4411, CVE-2012-4535, CVE-2012-4536, CVE-2012-4537, CVE-2012-4538, CVE-2012-4539, CVE-2012-5510, CVE-2012-5511, CVE-2012-5512, CVE-2012-5513, CVE-2012-5514, CVE-2012-5515, CVE-2012-5525, CVE-2012-5634
SHA-256 | 42fbd346dc4e79100c814835fd5068ef0a6bd2ccc23977307e7f191f8be1cc22
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