7.2 - USN-2692-1

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

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

References:
http://www.ubuntu.com/usn/usn-2692-1
CVE-2015-3214, CVE-2015-5154, CVE-2015-5158

Package Information:
https://launchpad.net/ubuntu/+source/qemu/1:2.2+dfsg-5expubuntu9.3
https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.15