USN-2692-1: QEMU vulnerabilities

28 July 2015

qemu vulnerabilities

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

  • Ubuntu 15.04
  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in QEMU.

Software Description

  • qemu - Machine emulator and virtualizer

Details

Matt Tait discovered that QEMU incorrectly handled PIT emulation. In a non-default configuration, 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-2015-3214)

Kevin Wolf discovered that QEMU incorrectly handled processing ATAPI commands. 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-2015-5154)

Zhu Donghai discovered that QEMU incorrectly handled the SCSI 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. This issue only affected Ubuntu 15.04. (CVE-2015-5158)

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-5expubuntu9.3
qemu-system-aarch64 - 1:2.2+dfsg-5expubuntu9.3
qemu-system-arm - 1:2.2+dfsg-5expubuntu9.3
qemu-system-mips - 1:2.2+dfsg-5expubuntu9.3
qemu-system-misc - 1:2.2+dfsg-5expubuntu9.3
qemu-system-ppc - 1:2.2+dfsg-5expubuntu9.3
qemu-system-sparc - 1:2.2+dfsg-5expubuntu9.3
qemu-system-x86 - 1:2.2+dfsg-5expubuntu9.3
Ubuntu 14.04 LTS
qemu-system - 2.0.0+dfsg-2ubuntu1.15
qemu-system-aarch64 - 2.0.0+dfsg-2ubuntu1.15
qemu-system-arm - 2.0.0+dfsg-2ubuntu1.15
qemu-system-mips - 2.0.0+dfsg-2ubuntu1.15
qemu-system-misc - 2.0.0+dfsg-2ubuntu1.15
qemu-system-ppc - 2.0.0+dfsg-2ubuntu1.15
qemu-system-sparc - 2.0.0+dfsg-2ubuntu1.15
qemu-system-x86 - 2.0.0+dfsg-2ubuntu1.15

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