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RHEL 6 : qemu-kvm (RHSA-2015:0867)

medium Nessus Plugin ID 82986

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Synopsis

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

Description

An updated qemu-kvm package that fixes one security issue and one bug is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link 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 package provides the user-space component for running virtual machines using KVM.

It was found that the Cirrus blit region checks were insufficient. A privileged guest user could use this flaw to write outside of VRAM- allocated buffer boundaries in the host's QEMU process address space with attacker-provided data. (CVE-2014-8106)

This issue was found by Paolo Bonzini of Red Hat.

This update also fixes the following bug :

* Previously, the effective downtime during the last phase of a live migration would sometimes be much higher than the maximum downtime specified by 'migration_downtime' in vdsm.conf. This problem has been corrected. The value of 'migration_downtime' is now honored and the migration is aborted if the downtime cannot be achieved. (BZ#1142756)

All qemu-kvm users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2015:0867

https://access.redhat.com/security/cve/cve-2014-8106

Plugin Details

Severity: Medium

ID: 82986

File Name: redhat-RHSA-2015-0867.nasl

Version: 1.10

Type: Local

Agent: unix

Published: 4/22/2015

Updated: 2/5/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 95.09

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:6.6, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:qemu-guest-agent, p-cpe:/a:redhat:enterprise_linux:qemu-img, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-debuginfo, p-cpe:/a:redhat:enterprise_linux:qemu-kvm-tools, p-cpe:/a:redhat:enterprise_linux:qemu-kvm

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 4/21/2015

Vulnerability Publication Date: 12/8/2014

Reference Information

CVE: CVE-2014-8106

BID: 71477

RHSA: 2015:0867