Oracle Linux 7 : qemu-kvm (ELSA-2017-1430)

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


Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

From Red Hat Security Advisory 2017:1430 :

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

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) :

* 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 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.

Bug Fix(es) :

* Previously, guest virtual machines in some cases became unresponsive
when the 'pty' back end of a serial device performed an irregular I/O
communication. This update improves the handling of serial I/O on
guests, which prevents the described problem from occurring.
(BZ#1452332)

See also :

https://oss.oracle.com/pipermail/el-errata/2017-June/006980.html

Solution :

Update the affected qemu-kvm packages.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 3.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 100776 ()

Bugtraq ID:

CVE ID: CVE-2017-7718
CVE-2017-7980

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