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Ubuntu Security Notice USN-2093-1
January 30, 2014

libvirt vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 13.10
- Ubuntu 12.10
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in libvirt.

Software Description:
- libvirt: Libvirt virtualization toolkit

Details:

Martin Kletzander discovered that libvirt incorrectly handled reading
memory tunables from LXC guests. A local user could possibly use this flaw
to cause libvirtd to crash, resulting in a denial of service. This issue
only affected Ubuntu 13.10. (CVE-2013-6436)

Dario Faggioli discovered that libvirt incorrectly handled the libxl
driver. A local user could possibly use this flaw to cause libvirtd to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only affected Ubuntu 13.10. (CVE-2013-6457)

It was discovered that libvirt contained multiple race conditions in block
device handling. A remote read-only user could use this flaw to cause
libvirtd to crash, resulting in a denial of service. (CVE-2013-6458)

Eric Blake discovered that libvirt incorrectly handled certain ACLs. An
attacker could use this flaw to possibly obtain certain sensitive
information. This issue only affected Ubuntu 13.10. (CVE-2014-0028)

Jiri Denemark discovered that libvirt incorrectly handled keepalives. A
remote attacker could possibly use this flaw to cause libvirtd to crash,
resulting in a denial of service. (CVE-2014-1447)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.10:
  libvirt-bin                     1.1.1-0ubuntu8.5
  libvirt0                        1.1.1-0ubuntu8.5

Ubuntu 12.10:
  libvirt-bin                     0.9.13-0ubuntu12.6
  libvirt0                        0.9.13-0ubuntu12.6

Ubuntu 12.04 LTS:
  libvirt-bin                     0.9.8-2ubuntu17.17
  libvirt0                        0.9.8-2ubuntu17.17

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2093-1
  CVE-2013-6436, CVE-2013-6457, CVE-2013-6458, CVE-2014-0028,
  CVE-2014-1447

Package Information:
  https://launchpad.net/ubuntu/+source/libvirt/1.1.1-0ubuntu8.5
  https://launchpad.net/ubuntu/+source/libvirt/0.9.13-0ubuntu12.6
  https://launchpad.net/ubuntu/+source/libvirt/0.9.8-2ubuntu17.17