U radu programskog paketa qemu-kvm uočene su dvije sigurnosne ranjivosti koje zlonamjerni korisnik može iskoristiti za izvođenje DoS napada ili pokretanje proizvoljnog programskog koda.

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Ubuntu Security Notice USN-1145-1
June 09, 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:

It was discovered that QEMU did not properly perform validation of I/O
operations from the guest which could lead to heap corruption. 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-2011-1750)

Nelson Elhage discoverd that QEMU did not properly handle memory when
removing ISA devices. 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-2011-1751)

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-0ubuntu4.1

Ubuntu 10.10:
  qemu-kvm                        0.12.5+noroms-0ubuntu7.5
  qemu-kvm-extras                 0.12.5+noroms-0ubuntu7.5
  qemu-kvm-extras-static          0.12.5+noroms-0ubuntu7.5

Ubuntu 10.04 LTS:
  qemu-kvm                        0.12.3+noroms-0ubuntu9.9
  qemu-kvm-extras                 0.12.3+noroms-0ubuntu9.9
  qemu-kvm-extras-static          0.12.3+noroms-0ubuntu9.9

After a standard system update you need to restart running virtual machines
to make all the necessary changes.

References:
  CVE-2011-1750, CVE-2011-1751

Package Information:
  https://launchpad.net/ubuntu/+source/qemu-kvm/0.14.0+noroms-0ubuntu4.1
  https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.5+noroms-0ubuntu7.5
  https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.3+noroms-0ubuntu9.9