Xen: Multiple vulnerabilities

Background

Xen is a bare-metal hypervisor.

Description

Multiple vulnerabilities have been discovered in Xen. Please review the CVE identifiers referenced below for details.

Impact

Guest domains could possibly gain privileges, execute arbitrary code, or cause a Denial of Service on the host domain (Dom0). Additionally, guest domains could gain information about other virtual machines running on the same host or read arbitrary files on the host.

Workaround

The CVEs listed below do not currently have fixes, but only apply to Xen setups which have “tmem” specified on the hypervisor command line. TMEM is not currently supported for use in production systems, and administrators using tmem should disable it. Relevant CVEs: * CVE-2012-2497 * CVE-2012-6030 * CVE-2012-6031 * CVE-2012-6032 * CVE-2012-6033 * CVE-2012-6034 * CVE-2012-6035 * CVE-2012-6036

Resolution

All Xen users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=app-emulation/xen-4.2.2-r1"

All Xen-tools users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose
 ">=app-emulation/xen-tools-4.2.2-r3"

All Xen-pvgrub users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose
 ">=app-emulation/xen-pvgrub-4.2.2-r1"