USN-1063-1: QEMU vulnerability

Ubuntu Security Notice USN-1063-1

14th February, 2011

qemu-kvm vulnerability

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10


Blank passwords allowed unrestricted QEMU VNC session access.

Software description

  • qemu-kvm - Full virtualization on i386 and amd64 hardware


Neil Wilson discovered that if VNC passwords were blank in QEMU
configurations, access to VNC sessions was allowed without a password
instead of being disabled. A remote attacker could connect to running
VNC sessions of QEMU and directly control the system. By default, QEMU
does not start VNC sessions.

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 10.10:
qemu-kvm 0.12.5+noroms-0ubuntu7.2
qemu-kvm-extras-static 0.12.5+noroms-0ubuntu7.2
kvm 0.12.5+noroms-0ubuntu7.2
qemu-arm-static 0.12.5+noroms-0ubuntu7.2
qemu-kvm-extras 0.12.5+noroms-0ubuntu7.2
qemu 0.12.5+noroms-0ubuntu7.2
Ubuntu 10.04 LTS:
qemu-kvm 0.12.3+noroms-0ubuntu9.4
qemu-kvm-extras 0.12.3+noroms-0ubuntu9.4
kvm 0.12.3+noroms-0ubuntu9.4
qemu-arm-static 0.12.3+noroms-0ubuntu9.4
qemu-kvm-extras-static 0.12.3+noroms-0ubuntu9.4
qemu-common 0.12.3+noroms-0ubuntu9.4
qemu 0.12.3+noroms-0ubuntu9.4
Ubuntu 9.10:
kvm 0.11.0-0ubuntu6.4
qemu 0.11.0-0ubuntu6.4
qemu-arm-static 0.11.0-0ubuntu6.4
qemu-kvm 0.11.0-0ubuntu6.4
qemu-kvm-extras 0.11.0-0ubuntu6.4

To update your system, please follow these instructions:

After a standard system update you need to restart any running QEMU sessions
to make all the necessary changes.