USN-1152-1: libvirt vulnerabilities

Releases

• Ubuntu 11.04
• Ubuntu 10.10
• Ubuntu 10.04

Packages

• libvirt - Libvirt virtualization toolkit

Details

It was discovered that libvirt did not use thread-safe error reporting. A
remote attacker could exploit this to cause a denial of service via
application crash. (CVE-2011-1486)

Eric Blake discovered that libvirt had an off-by-one error which could
be used to reopen disk probing and bypass the fix for CVE-2010-2238. A
privileged attacker in the guest could exploit this to read arbitrary files
on the host. This issue only affected Ubuntu 11.04. By default, guests are
confined by an AppArmor profile which provided partial protection against
this flaw. (CVE-2011-2178)

Update instructions

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

Ubuntu 11.04

• libvirt0 - 0.8.8-1ubuntu6.2
• libvirt-bin - 0.8.8-1ubuntu6.2

Ubuntu 10.10

• libvirt0 - 0.8.3-1ubuntu18
• libvirt-bin - 0.8.3-1ubuntu18

Ubuntu 10.04

• libvirt0 - 0.7.5-5ubuntu27.13
• libvirt-bin - 0.7.5-5ubuntu27.13

In general, a standard system update will make all the necessary changes.

References

• CVE-2011-1486
• CVE-2011-2178