==========================================================================
Ubuntu Security Notice USN-4467-1
August 19, 2020

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

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:
- qemu: Machine emulator and virtualizer

Details:

Ziming Zhang and VictorV discovered that the QEMU SLiRP networking
implementation incorrectly handled replying to certain ICMP echo requests.
An attacker inside a guest could possibly use this issue to leak host
memory to obtain sensitive information. This issue only affected Ubuntu
18.04 LTS. (CVE-2020-10756)

Eric Blake and Xueqiang Wei discovered that the QEMU NDB implementation
incorrectly handled certain requests. A remote attacker could possibly use
this issue to cause QEMU to crash, resulting in a denial of service. This
issue only affected Ubuntu 20.04 LTS. (CVE-2020-10761)

Ziming Zhang discovered that the QEMU SM501 graphics driver incorrectly
handled certain operations. An attacker inside a guest could use this issue
to cause QEMU to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-12829)

It was discovered that the QEMU SD memory card implementation incorrectly
handled certain memory operations. An attacker inside a guest could
possibly use this issue to cause QEMU to crash, resulting in a denial of
service. (CVE-2020-13253)

Ren Ding and Hanqing Zhao discovered that the QEMU ES1370 audio driver
incorrectly handled certain invalid frame counts. An attacker inside a
guest could possibly use this issue to cause QEMU to crash, resulting in a
denial of service. (CVE-2020-13361)

Ren Ding and Hanqing Zhao discovered that the QEMU MegaRAID SAS SCSI driver
incorrectly handled certain memory operations. An attacker inside a guest
could possibly use this issue to cause QEMU to crash, resulting in a denial
of service. (CVE-2020-13362)

Alexander Bulekov discovered that QEMU MegaRAID SAS SCSI driver incorrectly
handled certain memory space operations. An attacker inside a guest could
possibly use this issue to cause QEMU to crash, resulting in a denial of
service. (CVE-2020-13659)

Ren Ding, Hanqing Zhao, Alexander Bulekov, and Anatoly Trosinenko
discovered that the QEMU incorrectly handled certain msi-x mmio operations.
An attacker inside a guest could possibly use this issue to cause QEMU to
crash, resulting in a denial of service. (CVE-2020-13754)

It was discovered that QEMU incorrectly handled certain memory copy
operations when loading ROM contents. If a user were tricked into running
an untrusted kernel image, a remote attacker could possibly use this issue
to run arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu
18.04 LTS. (CVE-2020-13765)

Ren Ding, Hanqing Zhao, and Yi Ren discovered that the QEMU ATI video
driver incorrectly handled certain index values. An attacker inside a guest
could possibly use this issue to cause QEMU to crash, resulting in a denial
of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-13800)

Ziming Zhang discovered that the QEMU OSS audio driver incorrectly handled
certain operations. An attacker inside a guest could possibly use this
issue to cause QEMU to crash, resulting in a denial of service. This issue
only affected Ubuntu 20.04 LTS. (CVE-2020-14415)

Ziming Zhang discovered that the QEMU XGMAC Ethernet controller incorrectly
handled packet transmission. An attacker inside a guest could use this
issue to cause QEMU to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2020-15863)

Ziming Zhang discovered that the QEMU e1000e Ethernet controller
incorrectly handled packet processing. An attacker inside a guest could
possibly use this issue to cause QEMU to crash, resulting in a denial of
service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.
(CVE-2020-16092)

Update instructions:

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

Ubuntu 20.04 LTS:
  qemu                            1:4.2-3ubuntu6.4
  qemu-system                     1:4.2-3ubuntu6.4
  qemu-system-arm                 1:4.2-3ubuntu6.4
  qemu-system-mips                1:4.2-3ubuntu6.4
  qemu-system-ppc                 1:4.2-3ubuntu6.4
  qemu-system-s390x               1:4.2-3ubuntu6.4
  qemu-system-sparc               1:4.2-3ubuntu6.4
  qemu-system-x86                 1:4.2-3ubuntu6.4
  qemu-system-x86-microvm         1:4.2-3ubuntu6.4
  qemu-system-x86-xen             1:4.2-3ubuntu6.4

Ubuntu 18.04 LTS:
  qemu                            1:2.11+dfsg-1ubuntu7.31
  qemu-system                     1:2.11+dfsg-1ubuntu7.31
  qemu-system-mips                1:2.11+dfsg-1ubuntu7.31
  qemu-system-ppc                 1:2.11+dfsg-1ubuntu7.31
  qemu-system-s390x               1:2.11+dfsg-1ubuntu7.31
  qemu-system-sparc               1:2.11+dfsg-1ubuntu7.31
  qemu-system-x86                 1:2.11+dfsg-1ubuntu7.31

Ubuntu 16.04 LTS:
  qemu                            1:2.5+dfsg-5ubuntu10.45
  qemu-system                     1:2.5+dfsg-5ubuntu10.45
  qemu-system-aarch64             1:2.5+dfsg-5ubuntu10.45
  qemu-system-arm                 1:2.5+dfsg-5ubuntu10.45
  qemu-system-mips                1:2.5+dfsg-5ubuntu10.45
  qemu-system-ppc                 1:2.5+dfsg-5ubuntu10.45
  qemu-system-s390x               1:2.5+dfsg-5ubuntu10.45
  qemu-system-sparc               1:2.5+dfsg-5ubuntu10.45
  qemu-system-x86                 1:2.5+dfsg-5ubuntu10.45

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

References:
  https://usn.ubuntu.com/4467-1
  CVE-2020-10756, CVE-2020-10761, CVE-2020-12829, CVE-2020-13253,
  CVE-2020-13361, CVE-2020-13362, CVE-2020-13659, CVE-2020-13754,
  CVE-2020-13765, CVE-2020-13800, CVE-2020-14415, CVE-2020-15863,
  CVE-2020-16092

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/1:4.2-3ubuntu6.4
  https://launchpad.net/ubuntu/+source/qemu/1:2.11+dfsg-1ubuntu7.31
  https://launchpad.net/ubuntu/+source/qemu/1:2.5+dfsg-5ubuntu10.45