Ubuntu 14.04 LTS: USN-2630-1 Moderate: QEMU Denial of Service Issues

ubuntu

June 10, 2015

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:

Matt Tait discovered that QEMU incorrectly handled the virtual PCNET

driver. A malicious guest could use this issue to cause a denial of

service, or possibly execute arbitrary code on the host as the user running

the QEMU process. In the default installation, when QEMU is used with

libvirt, attackers would be isolated by the libvirt AppArmor profile.

(CVE-2015-3209)

Kurt Seifried discovered that QEMU incorrectly handled certain temporary

files. A local attacker could use this issue to cause a denial of service.

(CVE-2015-4037)

Jan Beulich discovered that the QEMU Xen code incorrectly restricted write

access to the host MSI message data field. A malicious guest could use this

issue to cause a denial of service. This issue only applied to Ubuntu 14.04

LTS, Ubuntu 14.10 and Ubuntu 15.04. (CVE-2015-4...

Read the Full Advisory

Topics Covered

security advisory denial of service arbitrary code execution Ubuntu system update qemu

Update Instructions

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

Ubuntu 15.04:
  qemu-system                     1:2.2+dfsg-5expubuntu9.2
  qemu-system-aarch64             1:2.2+dfsg-5expubuntu9.2
  qemu-system-arm                 1:2.2+dfsg-5expubuntu9.2
  qemu-system-mips                1:2.2+dfsg-5expubuntu9.2
  qemu-system-misc                1:2.2+dfsg-5expubuntu9.2
  qemu-system-ppc                 1:2.2+dfsg-5expubuntu9.2
  qemu-system-sparc               1:2.2+dfsg-5expubuntu9.2
  qemu-system-x86                 1:2.2+dfsg-5expubuntu9.2

Ubuntu 14.10:
  qemu-system                     2.1+dfsg-4ubuntu6.7
  qemu-system-aarch64             2.1+dfsg-4ubuntu6.7
  qemu-system-arm                 2.1+dfsg-4ubuntu6.7
  qemu-system-mips                2.1+dfsg-4ubuntu6.7
  qemu-system-misc                2.1+dfsg-4ubuntu6.7
  qemu-system-ppc                 2.1+dfsg-4ubuntu6.7
  qemu-system-sparc               2.1+dfsg-4ubuntu6.7
  qemu-system-x86                 2.1+dfsg-4ubuntu6.7

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.13
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.13
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.13
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.13
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.13
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.13
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.13
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.13

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.23

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