RHSA-2008:0892: Important: xen security and bug fix update

The xen packages contain tools for managing the virtual machine monitor inRed 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) tocause a denial of service, or, possibly, elevate privileges to theprivileged domain (Dom0). (CVE-2008-1952)A flaw was found in the QEMU block format auto-detection, when runningfully-virtualized guests and using Qemu images written on removable media(USB storage, 3.5" disks). Privileged users of such fully-virtualizedguests (DomU), with a raw-formatted disk image, were able to write a headerto that disk image describing another format. This could allow such gueststo 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, whichresolve these security issues and fix this bug.