Ubuntu 1165-1: QEMU vulnerabilities

    Date06 Jul 2011
    CategoryUbuntu
    54
    Posted ByLinuxSecurity Advisories
    A privileged attacker within a QEMU guest could cause QEMU to crash.
    ==========================================================================
    Ubuntu Security Notice USN-1165-1
    July 06, 2011
    
    qemu-kvm vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    
    Summary:
    
    A privileged attacker within a QEMU guest could cause QEMU to crash.
    
    Software Description:
    - qemu-kvm: Machine emulator and virtualizer
    
    Details:
    
    Nelson Elhage discoverd that QEMU did not properly validate certain
    virtqueue requests from the guest. An attacker could exploit this to cause
    a denial of service of the guest or possibly execute code with the
    privileges of the user invoking the program. (CVE-2011-2212)
    
    Stefan Hajnoczi discovered that QEMU did not properly perform integer
    comparisons when performing virtqueue input validation. An attacker could
    exploit this to cause a denial of service of the guest or possibly execute
    code with the privileges of the user invoking the program. (CVE-2011-2512)
    
    When using QEMU with libvirt or virtualization management software based on
    libvirt such as Eucalyptus and OpenStack, QEMU guests are individually
    isolated by an AppArmor profile by default in Ubuntu.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.04:
      qemu-kvm                        0.14.0+noroms-0ubuntu4.3
    
    Ubuntu 10.10:
      qemu-kvm                        0.12.5+noroms-0ubuntu7.8
      qemu-kvm-extras                 0.12.5+noroms-0ubuntu7.8
      qemu-kvm-extras-static          0.12.5+noroms-0ubuntu7.8
    
    Ubuntu 10.04 LTS:
      qemu-kvm                        0.12.3+noroms-0ubuntu9.12
      qemu-kvm-extras                 0.12.3+noroms-0ubuntu9.12
      qemu-kvm-extras-static          0.12.3+noroms-0ubuntu9.12
    
    After a standard system update you need to restart running virtual machines
    to make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1165-1
      CVE-2011-2212, CVE-2011-2512
    
    Package Information:
      https://launchpad.net/ubuntu/+source/qemu-kvm/0.14.0+noroms-0ubuntu4.3
      https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.5+noroms-0ubuntu7.8
      https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.3+noroms-0ubuntu9.12
    
    
    
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