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USN-2093-1: libvirt vulnerabilities

30 January 2014

Several security issues were fixed in libvirt.

Releases

Packages

  • 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
Ubuntu 12.10
Ubuntu 12.04

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