An updated Xen package to fix one security issue and two bugs is now
available for CentOS Linux 5.
This update has been rated as having important security impact by the Red
Hat Security Response Team.
The Xen package contains the tools for managing the virtual machine monitor
in CentOS Linux virtualization.
A flaw was found affecting the VNC server code in QEMU. On a
fullyvirtualized guest VM, where qemu monitor mode is enabled, a user who
had access to the VNC server could gain the ability to read arbitrary files
as root in the host filesystem. (CVE-2007-0998)
In addition to disabling qemu monitor mode, the following bugs were also fixed:
* Fix IA64 fully virtualized (VTi) shadow page table mode initialization.
* Fix network bonding in balanced-rr mode. Without this update, a network
path loss could result in packet loss.
Users of Xen should update to these erratum packages containing backported
patches which correct these issues.