A QEMU security update has been released for Ubuntu Linux 19.10, 18.04 LTS, and 16.04 LTS.

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Ubuntu Security Notice USN-4283-1
February 18, 2020

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

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

- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

Felipe Franciosi, Raphael Norwitz, and Peter Turschmid discovered that QEMU
incorrectly handled iSCSI server responses. A remote attacker in control of
the iSCSI server could use this issue to cause QEMU to crash, leading to a
denial of service, or possibly execute arbitrary code. (CVE-2020-1711)

It was discovered that the QEMU libslirp component incorrectly handled
memory. A remote attacker could use this issue to cause QEMU to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2020-7039, CVE-2020-8608)

Update instructions:

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

Ubuntu 19.10:
qemu 1:4.0+dfsg-0ubuntu9.4
qemu-system 1:4.0+dfsg-0ubuntu9.4
qemu-system-arm 1:4.0+dfsg-0ubuntu9.4
qemu-system-mips 1:4.0+dfsg-0ubuntu9.4
qemu-system-ppc 1:4.0+dfsg-0ubuntu9.4
qemu-system-s390x 1:4.0+dfsg-0ubuntu9.4
qemu-system-sparc 1:4.0+dfsg-0ubuntu9.4
qemu-system-x86 1:4.0+dfsg-0ubuntu9.4

Ubuntu 18.04 LTS:
qemu 1:2.11+dfsg-1ubuntu7.23
qemu-system 1:2.11+dfsg-1ubuntu7.23
qemu-system-arm 1:2.11+dfsg-1ubuntu7.23
qemu-system-mips 1:2.11+dfsg-1ubuntu7.23
qemu-system-ppc 1:2.11+dfsg-1ubuntu7.23
qemu-system-s390x 1:2.11+dfsg-1ubuntu7.23
qemu-system-sparc 1:2.11+dfsg-1ubuntu7.23
qemu-system-x86 1:2.11+dfsg-1ubuntu7.23

Ubuntu 16.04 LTS:
qemu 1:2.5+dfsg-5ubuntu10.43
qemu-system 1:2.5+dfsg-5ubuntu10.43
qemu-system-aarch64 1:2.5+dfsg-5ubuntu10.43
qemu-system-arm 1:2.5+dfsg-5ubuntu10.43
qemu-system-mips 1:2.5+dfsg-5ubuntu10.43
qemu-system-ppc 1:2.5+dfsg-5ubuntu10.43
qemu-system-s390x 1:2.5+dfsg-5ubuntu10.43
qemu-system-sparc 1:2.5+dfsg-5ubuntu10.43
qemu-system-x86 1:2.5+dfsg-5ubuntu10.43

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

References:
  https://usn.ubuntu.com/4283-1
CVE-2020-1711, CVE-2020-7039, CVE-2020-8608

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/1:4.0+dfsg-0ubuntu9.4
  https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.23
  https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.43