RHEL 7 : qemu-kvm-rhev (RHSA-2017:0985)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An update for qemu-kvm-rhev is now available for Red Hat
Virtualization Hypervisor 7.

Red Hat Product Security has rated this update as having a security
impact of Important. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

KVM (Kernel-based Virtual Machine) is a full virtualization solution
for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev packages
provide the user-space component for running virtual machines using
KVM in environments managed by Red Hat Virtualization Manager.

Security Fix(es) :

* Quick Emulator (QEMU), built with the Cirrus CLGD 54xx VGA Emulator
and the VNC display driver support, is vulnerable to a heap buffer
overflow issue. The issue could occur when a VNC client attempts to
update its display after a VGA operation is performed by a guest. A
privileged user/process inside guest could use this flaw to crash the
QEMU process resulting in DoS or, potentially, leverage it to execute
arbitrary code on the host with privileges of the QEMU process.
(CVE-2016-9603)

Bug Fix(es) :

* When attempting to use a virtual CPU with the 'invtsc' feature, the
'nonstop_tsc' flag was not set for the guest. This update adjusts the
flag to be migrateable, and 'nonstop_tsc' is now properly set when
requested. (BZ#1413897)

* Previously, the QEMU emulator failed to open disk images with
backing files stored on a Gluster volume. This update ensures that
QEMU is able to handle Gluster disk URIs correctly, and the problem no
longer occurs. (BZ#1425125)

* Prior to this update, creating a new GlusterFS instance in some
cases consumed an excessive amount of memory. This update reuses data
for existing GlusterFS volumes, which reduces the memory consumption
when creating new instances. (BZ#1413044)

* Under certain circumstances, guest machines previously encountered
I/O errors or were paused when a large number of block transfer
actions was being performed. With this update, QEMU ensures that the
number of block transfers does not exceed the host limit, which
prevents the described problem. (BZ#1431149)

Enhancement(s) :

* The QEMU emulator is now able to present virtual L3 cache
information to the guest. This improves the performance and stability
of tasks and processes that use L3 cache, such as SAP HANA.
(BZ#1430802)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-9603.html
http://rhn.redhat.com/errata/RHSA-2017-0985.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.9
(CVSS2#AV:A/AC:M/Au:S/C:P/I:P/A:P)
CVSS Temporal Score : 4.2
(CVSS2#E:U/RL:ND/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 99501 ()

Bugtraq ID:

CVE ID: CVE-2016-9603

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