Virtuozzo 6 : qemu-guest-agent / qemu-img / qemu-kvm / etc (VZLSA-2017-1206)

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


Synopsis :

The remote Virtuozzo host is missing a security update.

Description :

An update for qemu-kvm is now available for Red Hat Enterprise Linux
6.

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.

Kernel-based Virtual Machine (KVM) is a full virtualization solution
for Linux on a variety of architectures. The qemu-kvm package provides
the user-space component for running virtual machines that use KVM.

Security Fix(es) :

* A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA
emulator's VNC display driver support; the issue could occur when a
VNC client attempted to update its display after a VGA operation is
performed by a guest. A privileged user/process inside a guest could
use this flaw to crash the QEMU process or, potentially, execute
arbitrary code on the host with privileges of the QEMU process.
(CVE-2016-9603)

* An out-of-bounds r/w access issue was found in QEMU's Cirrus CLGD
54xx VGA Emulator support. The vulnerability could occur while copying
VGA data via various bitblt functions. A privileged user inside a
guest could use this flaw to crash the QEMU process or, potentially,
execute arbitrary code on the host with privileges of the QEMU
process. (CVE-2017-7980)

* An out-of-bounds memory access issue was found in QEMU's VNC display
driver support. The vulnerability could occur while refreshing the VNC
display surface area in the 'vnc_refresh_server_surface'. A
user/process inside a guest could use this flaw to crash the QEMU
process, resulting in a denial of service. (CVE-2017-2633)

* An out-of-bounds access issue was found in QEMU's Cirrus CLGD 54xx
VGA Emulator support. The vulnerability could occur while copying VGA
data using bitblt functions (for example,
cirrus_bitblt_rop_fwd_transp_). A privileged user inside a guest could
use this flaw to crash the QEMU process, resulting in denial of
service. (CVE-2017-7718)

Red Hat would like to thank Jiangxin (PSIRT Huawei Inc.) and Li Qiang
(Qihoo 360 Gear Team) for reporting CVE-2017-7980 and Jiangxin (PSIRT
Huawei Inc.) for reporting CVE-2017-7718.

Note that Tenable Network Security has attempted to extract the
preceding description block directly from the corresponding Red Hat
security advisory. Virtuozzo provides no description for VZLSA
advisories. Tenable has attempted to automatically clean and format
it as much as possible without introducing additional issues.

See also :

http://www.nessus.org/u?e16ea1b5
https://rhn.redhat.com/errata/RHSA-2017-1206.html

Solution :

Update the affected qemu-guest-agent / qemu-img / qemu-kvm / etc package.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 1.6
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Virtuozzo Local Security Checks

Nessus Plugin ID: 101463 ()

Bugtraq ID:

CVE ID: CVE-2016-9603
CVE-2017-2633
CVE-2017-7718
CVE-2017-7980

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