USN-1152-1: libvirt vulnerabilities

16 June 2011

libvirt vulnerabilities

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

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS

Summary

Libvirt could be made to crash or read arbitrary files on the host.

Software Description

  • 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
libvirt-bin - 0.8.8-1ubuntu6.2
libvirt0 - 0.8.8-1ubuntu6.2
Ubuntu 10.10
libvirt-bin - 0.8.3-1ubuntu18
libvirt0 - 0.8.3-1ubuntu18
Ubuntu 10.04 LTS
libvirt-bin - 0.7.5-5ubuntu27.13
libvirt0 - 0.7.5-5ubuntu27.13

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References