USN-3289-1: QEMU vulnerabilities

16 May 2017

qemu vulnerabilities

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in QEMU.

Software Description

  • qemu - Machine emulator and virtualizer

Details

Li Qiang discovered that QEMU incorrectly handled VirtFS directory sharing. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-7377, CVE-2017-8086)

Jiangxin discovered that QEMU incorrectly handled the Cirrus VGA device. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-7718)

Li Qiang and Jiangxin discovered that QEMU incorrectly handled the Cirrus VGA device when being used with a VNC connection. 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. (CVE-2017-7980)

Jiang Xin discovered that QEMU incorrectly handled the audio subsystem. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. (CVE-2017-8309)

Jiang Xin discovered that QEMU incorrectly handled the input subsystem. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-8379)

Update instructions

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

Ubuntu 17.04
qemu-system - 1:2.8+dfsg-3ubuntu2.2
qemu-system-aarch64 - 1:2.8+dfsg-3ubuntu2.2
qemu-system-arm - 1:2.8+dfsg-3ubuntu2.2
qemu-system-mips - 1:2.8+dfsg-3ubuntu2.2
qemu-system-misc - 1:2.8+dfsg-3ubuntu2.2
qemu-system-ppc - 1:2.8+dfsg-3ubuntu2.2
qemu-system-s390x - 1:2.8+dfsg-3ubuntu2.2
qemu-system-sparc - 1:2.8+dfsg-3ubuntu2.2
qemu-system-x86 - 1:2.8+dfsg-3ubuntu2.2
Ubuntu 16.10
qemu-system - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-aarch64 - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-arm - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-mips - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-misc - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-ppc - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-s390x - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-sparc - 1:2.6.1+dfsg-0ubuntu5.5
qemu-system-x86 - 1:2.6.1+dfsg-0ubuntu5.5
Ubuntu 16.04 LTS
qemu-system - 1:2.5+dfsg-5ubuntu10.14
qemu-system-aarch64 - 1:2.5+dfsg-5ubuntu10.14
qemu-system-arm - 1:2.5+dfsg-5ubuntu10.14
qemu-system-mips - 1:2.5+dfsg-5ubuntu10.14
qemu-system-misc - 1:2.5+dfsg-5ubuntu10.14
qemu-system-ppc - 1:2.5+dfsg-5ubuntu10.14
qemu-system-s390x - 1:2.5+dfsg-5ubuntu10.14
qemu-system-sparc - 1:2.5+dfsg-5ubuntu10.14
qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.14
Ubuntu 14.04 LTS
qemu-system - 2.0.0+dfsg-2ubuntu1.34
qemu-system-aarch64 - 2.0.0+dfsg-2ubuntu1.34
qemu-system-arm - 2.0.0+dfsg-2ubuntu1.34
qemu-system-mips - 2.0.0+dfsg-2ubuntu1.34
qemu-system-misc - 2.0.0+dfsg-2ubuntu1.34
qemu-system-ppc - 2.0.0+dfsg-2ubuntu1.34
qemu-system-sparc - 2.0.0+dfsg-2ubuntu1.34
qemu-system-x86 - 2.0.0+dfsg-2ubuntu1.34

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References