[RHSA-2013:0896-01] Moderate: qemu-kvm security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Moderate: qemu-kvm security and bug fix update

Advisory ID: RHSA-2013:0896-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2013-0896.html

Issue date: 2013-06-03

CVE Names: CVE-2013-2007

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1. Summary:

 

Updated qemu-kvm 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 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:

 

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Red Hat Enterprise Linux Workstation Optional (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.

 

It was found that QEMU Guest Agent (the "qemu-ga" service) created

certain files with world-writable permissions when run in daemon mode

(the default mode). An unprivileged guest user could use this flaw to

consume all free space on the partition containing the qemu-ga log file, or

modify the contents of the log. When a UNIX domain socket transport was

explicitly configured to be used (not the default), an unprivileged guest

user could potentially use this flaw to escalate their privileges in the

guest. This update requires manual action. Refer below for details.

(CVE-2013-2007)

 

This update does not change the permissions of the existing log file or

the UNIX domain socket. For these to be changed, stop the qemu-ga service,

and then manually remove all "group" and "other" permissions on the

affected files, or remove the files.

 

Note that after installing this update, files created by the

guest-file-open QEMU Monitor Protocol (QMP) command will still continue to

be created with world-writable permissions for backwards compatibility.

 

This issue was discovered by Laszlo Ersek of Red Hat.

 

This update also fixes the following bugs:

 

* Previously, due to integer overflow in code calculations, the qemu-kvm

utility was reporting incorrect memory size on QMP events when using the

virtio balloon driver with more than 4 GB of memory. This update fixes the

overflow in the code and qemu-kvm works as expected in the described

scenario. (BZ#958750)

 

* When the set_link flag is set to "off" to change the status of a network

card, the status is changed to "down" on the respective guest. Previously,

with certain network cards, when such a guest was restarted, the status of

the network card was unexpectedly reset to "up", even though the network

was unavailable. A patch has been provided to address this bug and the link

status change is now preserved across restarts for all network cards.

(BZ#927591)

 

All users of qemu-kvm should upgrade to these updated packages, which

contain backported patches to correct 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.

 

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/knowledge/articles/11258

 

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

 

927591 - use set_link to change rtl8139 and e1000 network card's status but fail to make effectively after reboot guest

956082 - CVE-2013-2007 qemu: guest agent creates files with insecure permissions in deamon mode

 

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-0.12.1.2-2.355.el6_4.5.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.i686.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-img-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.355.el6_4.5.x86_64.rpm

 

Red Hat Enterprise Linux Desktop Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/qemu-kvm-0.12.1.2-2.355.el6_4.5.src.rpm

 

x86_64:

qemu-guest-agent-win32-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.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-0.12.1.2-2.355.el6_4.5.src.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-img-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.355.el6_4.5.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/qemu-kvm-0.12.1.2-2.355.el6_4.5.src.rpm

 

x86_64:

qemu-guest-agent-win32-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.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-0.12.1.2-2.355.el6_4.5.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.i686.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-img-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.355.el6_4.5.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/qemu-kvm-0.12.1.2-2.355.el6_4.5.src.rpm

 

x86_64:

qemu-guest-agent-win32-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.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-0.12.1.2-2.355.el6_4.5.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.i686.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-img-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.355.el6_4.5.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 6):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/qemu-kvm-0.12.1.2-2.355.el6_4.5.src.rpm

 

x86_64:

qemu-guest-agent-win32-0.12.1.2-2.355.el6_4.5.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.355.el6_4.5.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-2013-2007.html

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

 

8. Contact:

 

The Red Hat security contact is . More contact

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

 

Copyright 2013 Red Hat, Inc.

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