==========================================================================
Ubuntu Security Notice USN-3826-1
November 26, 2018

qemu vulnerabilities
==========================================================================

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

– Ubuntu 18.10
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS
– Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:
– qemu: Machine emulator and virtualizer

Details:

Daniel Shapira and Arash Tohidi discovered that QEMU incorrectly handled
NE2000 device emulation. An attacker inside the guest could use this issue
to cause QEMU to crash, resulting in a denial of service. (CVE-2018-10839)

It was discovered that QEMU incorrectly handled the Slirp networking
back-end. 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 affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu
18.04 LTS. (CVE-2018-11806)

Fakhri Zulkifli discovered that the QEMU guest agent incorrectly handled
certain QMP commands. An attacker could possibly use this issue to crash
the QEMU guest agent, resulting in a denial of service. (CVE-2018-12617)

Li Qiang discovered that QEMU incorrectly handled NVM Express Controller
emulation. 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 affected Ubuntu 18.04 LTS and Ubuntu 18.10. (CVE-2018-16847)

Daniel Shapira and Arash Tohidi discovered that QEMU incorrectly handled
RTL8139 device emulation. An attacker inside the guest could use this issue
to cause QEMU to crash, resulting in a denial of service. (CVE-2018-17958)

Daniel Shapira and Arash Tohidi discovered that QEMU incorrectly handled
PCNET device emulation. An attacker inside the guest could use this issue
to cause QEMU to crash, resulting in a denial of service. (CVE-2018-17962)

Daniel Shapira discovered that QEMU incorrectly handled large packet sizes.
An attacker inside the guest could use this issue to cause QEMU to crash,
resulting in a denial of service. (CVE-2018-17963)

It was discovered that QEMU incorrectly handled LSI53C895A device
emulation. An attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service. (CVE-2018-18849)

Moguofang discovered that QEMU incorrectly handled the IPowerNV LPC
controller. An attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service. This issue only affected Ubuntu
18.04 LTS and Ubuntu 18.10. (CVE-2018-18954)

Zhibin Hu discovered that QEMU incorrectly handled the Plan 9 File System
support. An attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service. (CVE-2018-19364)

Update instructions:

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

Ubuntu 18.10:
qemu-system 1:2.12+dfsg-3ubuntu8.1
qemu-system-arm 1:2.12+dfsg-3ubuntu8.1
qemu-system-mips 1:2.12+dfsg-3ubuntu8.1
qemu-system-misc 1:2.12+dfsg-3ubuntu8.1
qemu-system-ppc 1:2.12+dfsg-3ubuntu8.1
qemu-system-s390x 1:2.12+dfsg-3ubuntu8.1
qemu-system-sparc 1:2.12+dfsg-3ubuntu8.1
qemu-system-x86 1:2.12+dfsg-3ubuntu8.1

Ubuntu 18.04 LTS:
qemu-system 1:2.11+dfsg-1ubuntu7.8
qemu-system-arm 1:2.11+dfsg-1ubuntu7.8
qemu-system-mips 1:2.11+dfsg-1ubuntu7.8
qemu-system-misc 1:2.11+dfsg-1ubuntu7.8
qemu-system-ppc 1:2.11+dfsg-1ubuntu7.8
qemu-system-s390x 1:2.11+dfsg-1ubuntu7.8
qemu-system-sparc 1:2.11+dfsg-1ubuntu7.8
qemu-system-x86 1:2.11+dfsg-1ubuntu7.8

Ubuntu 16.04 LTS:
qemu-system 1:2.5+dfsg-5ubuntu10.33
qemu-system-aarch64 1:2.5+dfsg-5ubuntu10.33
qemu-system-arm 1:2.5+dfsg-5ubuntu10.33
qemu-system-mips 1:2.5+dfsg-5ubuntu10.33
qemu-system-misc 1:2.5+dfsg-5ubuntu10.33
qemu-system-ppc 1:2.5+dfsg-5ubuntu10.33
qemu-system-s390x 1:2.5+dfsg-5ubuntu10.33
qemu-system-sparc 1:2.5+dfsg-5ubuntu10.33
qemu-system-x86 1:2.5+dfsg-5ubuntu10.33

Ubuntu 14.04 LTS:
qemu-system 2.0.0+dfsg-2ubuntu1.44
qemu-system-aarch64 2.0.0+dfsg-2ubuntu1.44
qemu-system-arm 2.0.0+dfsg-2ubuntu1.44
qemu-system-mips 2.0.0+dfsg-2ubuntu1.44
qemu-system-misc 2.0.0+dfsg-2ubuntu1.44
qemu-system-ppc 2.0.0+dfsg-2ubuntu1.44
qemu-system-sparc 2.0.0+dfsg-2ubuntu1.44
qemu-system-x86 2.0.0+dfsg-2ubuntu1.44

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

References:
https://usn.ubuntu.com/usn/usn-3826-1
CVE-2018-10839, CVE-2018-11806, CVE-2018-12617, CVE-2018-16847,
CVE-2018-17958, CVE-2018-17962, CVE-2018-17963, CVE-2018-18849,
CVE-2018-18954, CVE-2018-19364

Package Information:
https://launchpad.net/ubuntu/+source/qemu/1:2.12+dfsg-3ubuntu8.1
https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.8
https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.33
https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.44

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