Ubuntu 1152-1: libvirt vulnerabilities

    Date16 Jun 2011
    CategoryUbuntu
    34
    Posted ByLinuxSecurity Advisories
    Libvirt could be made to crash or read arbitrary files on the host.
    ==========================================================================
    Ubuntu Security Notice USN-1152-1
    June 16, 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
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      CVE-2011-1486, CVE-2011-2178
    
    Package Information:
      https://launchpad.net/ubuntu/+source/libvirt/0.8.8-1ubuntu6.2
      https://launchpad.net/ubuntu/+source/libvirt/0.8.3-1ubuntu18
      https://launchpad.net/ubuntu/+source/libvirt/0.7.5-5ubuntu27.13
    
    
    
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