Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : qemu, qemu-kvm regression (USN-3047-2)

Ubuntu Security Notice (C) 2016 Canonical, Inc. / NASL script (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

USN-3047-1 fixed vulnerabilities in QEMU. The patch to fix
CVE-2016-5403 caused a regression which resulted in save/restore
failures when virtio memory balloon statistics are enabled. This
update temporarily reverts the security fix for CVE-2016-5403 pending
further investigation. We apologize for the inconvenience.

Li Qiang discovered that QEMU incorrectly handled 53C9X Fast SCSI
controller emulation. 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 applied to
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-4439, CVE-2016-4441,
CVE-2016-5238, CVE-2016-5338, CVE-2016-6351)

Li Qiang and Qinghao Tang discovered that QEMU incorrectly
handled the VMware VGA module. A privileged attacker inside
the guest could use this issue to cause QEMU to crash,
resulting in a denial of service, or possibly to obtain
sensitive host memory. (CVE-2016-4453, CVE-2016-4454)

Li Qiang discovered that QEMU incorrectly handled VMWARE
PVSCSI paravirtual SCSI bus emulation support. A privileged
attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service. This issue only
applied to Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
(CVE-2016-4952)

Li Qiang discovered that QEMU incorrectly handled MegaRAID
SAS 8708EM2 Host Bus Adapter emulation support. A privileged
attacker inside the guest could use this issue to cause QEMU
to crash, resulting in a denial of service, or possibly to
obtain sensitive host memory. This issue only applied to
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-5105,
CVE-2016-5106, CVE-2016-5107, CVE-2016-5337)

It was discovered that QEMU incorrectly handled certain
iSCSI asynchronous I/O ioctl calls. 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 applied to Ubuntu 14.04
LTS and Ubuntu 16.04 LTS. (CVE-2016-5126)

Zhenhao Hong discovered that QEMU incorrectly handled the
Virtio module. A privileged attacker inside the guest could
use this issue to cause QEMU to crash, resulting in a denial
of service. (CVE-2016-5403).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

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