Ubuntu Security Notice USN-1145-1
9th June, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
A privileged attacker within a QEMU guest could cause QEMU to crash.
- qemu-kvm - Machine emulator and virtualizer
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.
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.
The problem can be corrected by updating your system to the following package version:
- 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
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart running virtual machines
to make all the necessary changes.