Important: qemu-kvm-rhev security and bug fix update
Security Advisory: Important
Updated qemu-kvm-rhev packages that fix one security issue and two bugs are
now available for Red Hat Enterprise Linux 6.
The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System (CVSS)
base score, which gives a detailed severity rating, is available from the
CVE link in the References section.
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev packages form the
user-space component for running virtual machines using KVM.
A flaw was found in the way QEMU handled VT100 terminal escape sequences
when emulating certain character devices. A guest user with privileges to
write to a character device that is emulated on the host using a virtual
console back-end could use this flaw to crash the qemu-kvm process on the
host or, possibly, escalate their privileges on the host. (CVE-2012-3515)
When using qemu-kvm-rhev on a Red Hat Enterprise Linux 6 host not managed
by Red Hat Enterprise Virtualization:
When using qemu-kvm-rhev on a Red Hat Enterprise Virtualization managed Red
Hat Enterprise Linux 6 host:
To specify a virtual console back-end for a device and therefore be
vulnerable to this issue, the device would have to be created another way,
for example, by using a VDSM hook.
Red Hat would like to thank the Xen project for reporting this issue.
This update also fixes the following bugs:
All users of qemu-kvm-rhev are advised to upgrade to these updated
packages, which fix these issues. After installing this update, shut down
all running virtual machines. Once all virtual machines have shut down,
start them again for this update to take effect.
Before applying this update, make sure all previously-released errata
relevant to your system have been applied.
This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/knowledge/articles/11258