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Ubuntu 16.04/14.04/12.04 LTS: USN-3047-1 Critical QEMU DoS Fix

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Calendar Grey August 4, 2016
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Imperative security patches for QEMU tackle multiple weaknesses in Ubuntu. Upgrade advised to avert possible threats.
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:

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.

(CVE-2016-4439, CVE-2016-4441, CVE-2016-5238, CVE-2016-5338, CVE-2016-6351)

Li Qiang and Qinghao Tang discovered that QEMU incorrectly handled the

VMWare VGA module. 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. (CVE-2016-4453, CVE-2016-4454)

Li Qia...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue software update ubuntu qemu

Update Instructions

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

Ubuntu 16.04 LTS:
  qemu-system                     1:2.5+dfsg-5ubuntu10.3
  qemu-system-aarch64             1:2.5+dfsg-5ubuntu10.3
  qemu-system-arm                 1:2.5+dfsg-5ubuntu10.3
  qemu-system-mips                1:2.5+dfsg-5ubuntu10.3
  qemu-system-misc                1:2.5+dfsg-5ubuntu10.3
  qemu-system-ppc                 1:2.5+dfsg-5ubuntu10.3
  qemu-system-s390x               1:2.5+dfsg-5ubuntu10.3
  qemu-system-sparc               1:2.5+dfsg-5ubuntu10.3
  qemu-system-x86                 1:2.5+dfsg-5ubuntu10.3

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.26
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.26
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.26
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.26
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.26
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.26
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.26
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.26

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.29

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

References

https://ubuntu.com/security/notices/USN-3047-1

CVE-2016-4439, CVE-2016-4441, CVE-2016-4453, CVE-2016-4454,

CVE-2016-4952, CVE-2016-5105, CVE-2016-5106, CVE-2016-5107,

CVE-2016-5126, CVE-2016-5238, CVE-2016-5337, CVE-2016-5338,

CVE-2016-5403, CVE-2016-6351

Severity
critical
Lowest
Low
Medium
High
Critical

August 04, 2016

Topics%20covered

Topics Covered

security advisory denial of service security issue software update ubuntu qemu

Package Information

https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.3
https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.26
https://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-0ubuntu14.29

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