Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2012.0078
Important: qemu-kvm security, bug fix, and enhancement update
24 January 2012
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: qemu-kvm
kvm
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux WS/Desktop 6
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2012-0029 CVE-2011-4622 CVE-2011-4127
Reference: ESB-2012.0065
ESB-2011.1279
ESB-2011.1277.2
Original Bulletin:
https://rhn.redhat.com/errata/RHSA-2012-0050.html
https://rhn.redhat.com/errata/RHSA-2012-0051.html
Comment: This bulletin contains two (2) Red Hat security advisories.
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Red Hat Security Advisory
Synopsis: Important: qemu-kvm security, bug fix, and enhancement update
Advisory ID: RHSA-2012:0050-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0050.html
Issue date: 2012-01-23
CVE Names: CVE-2012-0029
=====================================================================
1. Summary:
Updated qemu-kvm packages that fix one security issue, one bug, and add
one enhancement 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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux Desktop (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - x86_64
Red Hat Enterprise Linux Workstation (v. 6) - x86_64
3. Description:
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. qemu-kvm is the user-space component
for running virtual machines using KVM.
A heap overflow flaw was found in the way QEMU-KVM emulated the e1000
network interface card. A privileged guest user in a virtual machine whose
network interface is configured to use the e1000 emulated driver could use
this flaw to crash the host or, possibly, escalate their privileges on the
host. (CVE-2012-0029)
Red Hat would like to thank Nicolae Mogoreanu for reporting this issue.
This update also fixes the following bug:
* qemu-kvm has a "scsi" option, to be used, for example, with the
"-device" option: "-device virtio-blk-pci,drive=[drive name],scsi=off".
Previously, however, it only masked the feature bit, and did not reject
SCSI commands if a malicious guest ignored the feature bit and issued a
request. This update corrects this issue. The "scsi=off" option can be
used to mitigate the virtualization aspect of CVE-2011-4127 before the
RHSA-2011:1849 kernel update is installed on the host.
This mitigation is only required if you do not have the RHSA-2011:1849
kernel update installed on the host and you are using raw format virtio
disks backed by a partition or LVM volume.
If you run guests by invoking /usr/libexec/qemu-kvm directly, use the
"-global virtio-blk-pci.scsi=off" option to apply the mitigation. If you
are using libvirt, as recommended by Red Hat, and have the RHBA-2012:0013
libvirt update installed, no manual action is required: guests will
automatically use "scsi=off". (BZ#767721)
Note: After installing the RHSA-2011:1849 kernel update, SCSI requests
issued by guests via the SG_IO IOCTL will not be passed to the underlying
block device when using raw format virtio disks backed by a partition or
LVM volume, even if "scsi=on" is used.
As well, this update adds the following enhancement:
* Prior to this update, qemu-kvm was not built with RELRO or PIE support.
qemu-kvm is now built with full RELRO and PIE support as a security
enhancement. (BZ#767906)
All users of qemu-kvm should upgrade to these updated packages, which
correct these issues and add this enhancement. 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.
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
5. Bugs fixed (http://bugzilla.redhat.com/):
772075 - CVE-2012-0029 qemu-kvm: e1000: process_tx_desc legacy mode packets heap overflow
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/qemu-kvm-0.12.1.2-2.209.el6_2.4.src.rpm
x86_64:
qemu-img-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.209.el6_2.4.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/qemu-kvm-0.12.1.2-2.209.el6_2.4.src.rpm
x86_64:
qemu-img-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.209.el6_2.4.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/qemu-kvm-0.12.1.2-2.209.el6_2.4.src.rpm
x86_64:
qemu-img-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.209.el6_2.4.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/qemu-kvm-0.12.1.2-2.209.el6_2.4.src.rpm
x86_64:
qemu-img-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.209.el6_2.4.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.209.el6_2.4.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-2012-0029.html
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/kb/docs/DOC-67874
https://rhn.redhat.com/errata/RHSA-2011-1849.html
https://rhn.redhat.com/errata/RHBA-2012-0013.html
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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Red Hat Security Advisory
Synopsis: Important: kvm security update
Advisory ID: RHSA-2012:0051-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0051.html
Issue date: 2012-01-23
CVE Names: CVE-2011-4622 CVE-2012-0029
=====================================================================
1. Summary:
Updated kvm packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.
The Red Hat Security Response Team has rated this update as having
important 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.
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.
A heap overflow flaw was found in the way QEMU-KVM emulated the e1000
network interface card. A privileged guest user in a virtual machine whose
network interface is configured to use the e1000 emulated driver could use
this flaw to crash the host or, possibly, escalate their privileges on the
host. (CVE-2012-0029)
A flaw was found in the way the KVM subsystem of a Linux kernel handled PIT
(Programmable Interval Timer) IRQs (interrupt requests) when there was no
virtual interrupt controller set up. A malicious user in the kvm group on
the host could force this situation to occur, resulting in the host
crashing. (CVE-2011-4622)
Red Hat would like to thank Nicolae Mogoreanu for reporting CVE-2012-0029.
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/):
769721 - CVE-2011-4622 kernel: kvm: pit timer with no irqchip crashes the system
772075 - CVE-2012-0029 qemu-kvm: e1000: process_tx_desc legacy mode packets heap overflow
6. Package List:
RHEL Desktop Multi OS (v. 5 client):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/kvm-83-239.el5_7.1.src.rpm
x86_64:
kmod-kvm-83-239.el5_7.1.x86_64.rpm
kmod-kvm-debug-83-239.el5_7.1.x86_64.rpm
kvm-83-239.el5_7.1.x86_64.rpm
kvm-debuginfo-83-239.el5_7.1.x86_64.rpm
kvm-qemu-img-83-239.el5_7.1.x86_64.rpm
kvm-tools-83-239.el5_7.1.x86_64.rpm
RHEL Virtualization (v. 5 server):
Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/kvm-83-239.el5_7.1.src.rpm
x86_64:
kmod-kvm-83-239.el5_7.1.x86_64.rpm
kmod-kvm-debug-83-239.el5_7.1.x86_64.rpm
kvm-83-239.el5_7.1.x86_64.rpm
kvm-debuginfo-83-239.el5_7.1.x86_64.rpm
kvm-qemu-img-83-239.el5_7.1.x86_64.rpm
kvm-tools-83-239.el5_7.1.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-2011-4622.html
https://www.redhat.com/security/data/cve/CVE-2012-0029.html
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2012 Red Hat, Inc.
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