USN-3047-1: QEMU vulnerabilities

Ubuntu Security Notice USN-3047-1

4th August, 2016

qemu, qemu-kvm vulnerabilities

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

• Ubuntu 16.04 LTS



• Ubuntu 14.04 LTS



• Ubuntu 12.04 LTS

Summary

Several security issues were fixed in QEMU.

Software description

• qemu
  - Machine emulator and virtualizer
  
  







• qemu-kvm
  - Machine emulator and virtualizer
  
  

Details

Li Qiang discovered that QEMU incorrectly handled 53C9X Fast SCSI
controller emulation. A privileged attacker inside the guest could use this
issue to cause QEMU to crash, resulting in a denial of service, or possibly
execute arbitrary code on the host. In the default installation, when QEMU
is used with libvirt, attackers would be isolated by the libvirt AppArmor
profile. This issue only applied to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(, , , )

Li Qiang discovered that QEMU incorrectly handled MegaRAID SAS 8708EM2 Host
Bus Adapter emulation support. A privileged attacker inside the guest could
use this issue to cause QEMU to crash, resulting in a denial of service, or
possibly to obtain sensitive host memory. This issue only applied to Ubuntu
14.04 LTS and Ubuntu 16.04 LTS. (,
)

It was discovered that QEMU incorrectly handled certain iSCSI asynchronous
I/O ioctl calls. An attacker inside the guest could use this issue to cause
QEMU to crash, resulting in a denial of service, or possibly execute
arbitrary code on the host. In the default installation, when QEMU is used
with libvirt, attackers would be isolated by the libvirt AppArmor profile.
This issue only applied to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
()

Update instructions

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

Ubuntu 16.04 LTS:

Ubuntu 14.04 LTS:

Ubuntu 12.04 LTS:

To update your system, please follow these instructions:
,

,

,

,

,

,

,

CVE-2016-6351