RHSA-2012:0422 - Security Advisory

Topic

An updated rhev-hypervisor6 package that fixes two security issues and one
bug is now available.

The Red Hat Security Response Team has rated this update as having moderate
security impact. Common Vulnerability Scoring System (CVSS) base scores,
which give detailed severity ratings, are available for each vulnerability
from the CVE links in the References section.

Description

The rhev-hypervisor6 package provides a Red Hat Enterprise Virtualization
Hypervisor ISO disk image. The Red Hat Enterprise Virtualization Hypervisor
is a dedicated Kernel-based Virtual Machine (KVM) hypervisor. It includes
everything necessary to run and manage virtual machines: A subset of the
Red Hat Enterprise Linux operating environment and the Red Hat Enterprise
Virtualization Agent.

Note: Red Hat Enterprise Virtualization Hypervisor is only available for
the Intel 64 and AMD64 architectures with virtualization extensions.

A flaw was found in the way the Linux kernel's KVM hypervisor
implementation emulated the syscall instruction for 32-bit guests. An
unprivileged guest user could trigger this flaw to crash the guest.
(CVE-2012-0045)

A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query()
function. An attacker able to send certain IGMP (Internet Group Management
Protocol) packets to a target system could use this flaw to cause a denial
of service. (CVE-2012-0207)

Red Hat would like to thank Stephan Bärwolf for reporting CVE-2012-0045,
and Simon McVittie for reporting CVE-2012-0207.

This updated package provides updated components that include fixes for
various security issues. These issues have no security impact on Red Hat
Enterprise Virtualization Hypervisor itself, however. The security fixes
included in this update address the following CVE numbers:

CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4347, CVE-2011-4594,
CVE-2011-4611, CVE-2011-4622 and CVE-2012-0038 (kernel issues)

CVE-2012-0444 (libvorbis issue)

CVE-2012-0841 (libxml2 issue)

This update also fixes the following bug:

• The rhev-hypervisor5 and rhev-hypervisor6 packages sometimes updated the

symbolic links in the /usr/share/rhev-hypervisor/ directory with incorrect
targets. The packages have been updated, they now always update the
symbolic links with the correct targets. (BZ#784706)

Users of Red Hat Enterprise Virtualization Hypervisor are advised to
upgrade to this updated package, which fixes these issues.

Solution

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

Affected Products

• Red Hat Virtualization 6 x86_64

Fixes

• BZ - 772867 - CVE-2012-0207 kernel: igmp: Avoid zero delay when receiving odd mixture of IGMP queries
• BZ - 773370 - CVE-2012-0045 kernel: kvm: syscall instruction induced guest panic
• BZ - 796913 - rhev-hypervisor6 6.2 Update 3 Release bugzilla
• BZ - 796915 - RHEV-H 6.2 register to SAM failed via TUI.
• BZ - 798183 - RHEV-H 6.2.z name is incorrect.

CVEs

• CVE-2012-0207
• CVE-2012-0045

References

• https://access.redhat.com/security/updates/classification/#moderate