xen security update

ID CESA-2008:0892
Type centos
Reporter CentOS Project
Modified 2008-10-05T17:02:53


CentOS Errata and Security Advisory CESA-2008:0892

The xen packages contain tools for managing the virtual machine monitor in Red Hat Virtualization.

It was discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the frontend's framebuffer description properly. This could allow a privileged user in the unprivileged domain (DomU) to cause a denial of service, or, possibly, elevate privileges to the privileged domain (Dom0). (CVE-2008-1952)

A flaw was found in the QEMU block format auto-detection, when running fully-virtualized guests and using Qemu images written on removable media (USB storage, 3.5" disks). Privileged users of such fully-virtualized guests (DomU), with a raw-formatted disk image, were able to write a header to that disk image describing another format. This could allow such guests to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945)

Additionally, the following bug is addressed in this update:

  • The qcow-create command terminated when invoked due to glibc bounds checking on the realpath() function.

Users of xen are advised to upgrade to these updated packages, which resolve these security issues and fix this bug.

Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-announce/2008-October/015299.html http://lists.centos.org/pipermail/centos-announce/2008-October/015300.html

Affected packages: xen xen-devel xen-libs

Upstream details at: https://rhn.redhat.com/errata/RHSA-2008-0892.html