Ubuntu 14.x USN-2439-1 Moderate: QEMU Privilege Escalation Threat

ubuntu

December 11, 2014

Several security issues were fixed in QEMU.

Summary

Several security issues were fixed in QEMU.

Software Description:

- qemu: Machine emulator and virtualizer

- qemu-kvm: Machine emulator and virtualizer

Details:

Michael S. Tsirkin discovered that QEMU incorrectly handled certain

parameters during ram load while performing a migration. An attacker able

to manipulate savevm data could use this issue to possibly execute

arbitrary code on the host. This issue only affected Ubuntu 12.04 LTS,

Ubuntu 14.04 LTS, and Ubuntu 14.10. (CVE-2014-7840)

Paolo Bonzini discovered that QEMU incorrectly handled memory in the Cirrus

VGA device. A malicious guest could possibly use this issue to write into

memory of the host, leading to privilege escalation. (CVE-2014-8106)

Topics Covered

security advisory privilege escalation Ubuntu moderate severity update instructions QEMU

Update Instructions

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

Ubuntu 14.10:
  qemu-system                     2.1+dfsg-4ubuntu6.3
  qemu-system-aarch64             2.1+dfsg-4ubuntu6.3
  qemu-system-arm                 2.1+dfsg-4ubuntu6.3
  qemu-system-mips                2.1+dfsg-4ubuntu6.3
  qemu-system-misc                2.1+dfsg-4ubuntu6.3
  qemu-system-ppc                 2.1+dfsg-4ubuntu6.3
  qemu-system-sparc               2.1+dfsg-4ubuntu6.3
  qemu-system-x86                 2.1+dfsg-4ubuntu6.3

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.9
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.9
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.9
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.9
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.9
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.9
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.9
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.9

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.21

Ubuntu 10.04 LTS:
  qemu-kvm                        0.12.3+noroms-0ubuntu9.26

After a standard system update you need to reboot your computer to make
all the necessary changes.