[RHSA-2012:0149-03] Moderate: kvm security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Moderate: kvm security and bug fix update

Advisory ID: RHSA-2012:0149-03

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0149.html

Issue date: 2012-02-21

CVE Names: CVE-2011-4347

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1. Summary:

 

Updated kvm packages that fix one security issue and several bugs are now

available for Red Hat Enterprise Linux 5.

 

The Red Hat Security Response Team has rated this update as having moderate

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.

 

2. Relevant releases/architectures:

 

RHEL Desktop Multi OS (v. 5 client) - x86_64

RHEL Virtualization (v. 5 server) - x86_64

 

3. Description:

 

KVM (Kernel-based Virtual Machine) is a full virtualization solution for

Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for

the standard Red Hat Enterprise Linux kernel.

 

It was found that the kvm_vm_ioctl_assign_device() function in the KVM

subsystem of a Linux kernel did not check if the user requesting device

assignment was privileged or not. A member of the kvm group on the host

could assign unused PCI devices, or even devices that were in use and

whose resources were not properly claimed by the respective drivers, which

could result in the host crashing. (CVE-2011-4347)

 

Red Hat would like to thank Sasha Levin for reporting this issue.

 

These updated kvm packages include several bug fixes. Space precludes

documenting all of these changes in this advisory. Users are directed to

the Red Hat Enterprise Linux 5.8 Technical Notes, linked to in the

References, for information on the most significant of these changes.

 

All KVM users should upgrade to these updated packages, which contain

backported patches to correct these issues. Note: The procedure in the

Solution section must be performed before this update will take effect.

 

4. 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/kb/docs/DOC-11259

 

The following procedure must be performed before this update will take

effect:

 

1) Stop all KVM guest virtual machines.

 

2) Either reboot the hypervisor machine or, as the root user, remove (using

"modprobe -r [module]") and reload (using "modprobe [module]") all of the

following modules which are currently running (determined using "lsmod"):

kvm, ksm, kvm-intel or kvm-amd.

 

3) Restart the KVM guest virtual machines.

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

701616 - limitation on max number of assigned devices does not take effect if hot-plug pci devices

703335 - KVM guest clocks jump forward one hour on reboot

703446 - Failed to ping guest after MTU is changed

704081 - mouse responds very slowly with huge memory

725876 - RTC interrupt problems with RHEL5 qemu/kvm (0.10 based) on 2.6.38+ guest kernels.

753860 - Fix kvm userspace compilation on RHEL-5 to match the kernel changes

756084 - CVE-2011-4347 kernel: kvm: device assignment DoS

 

6. Package List:

 

RHEL Desktop Multi OS (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-249.el5.src.rpm

 

x86_64:

kmod-kvm-83-249.el5.x86_64.rpm

kmod-kvm-debug-83-249.el5.x86_64.rpm

kvm-83-249.el5.x86_64.rpm

kvm-debuginfo-83-249.el5.x86_64.rpm

kvm-qemu-img-83-249.el5.x86_64.rpm

kvm-tools-83-249.el5.x86_64.rpm

 

RHEL Virtualization (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-249.el5.src.rpm

 

x86_64:

kmod-kvm-83-249.el5.x86_64.rpm

kmod-kvm-debug-83-249.el5.x86_64.rpm

kvm-83-249.el5.x86_64.rpm

kvm-debuginfo-83-249.el5.x86_64.rpm

kvm-qemu-img-83-249.el5.x86_64.rpm

kvm-tools-83-249.el5.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2011-4347.html

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

https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/5.8_Technical_Notes/kvm.html#RHSA-2012-0149

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2012 Red Hat, Inc.

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