RHEL 6 : libvirt (RHSA-2014:0560)

critical Nessus Plugin ID 74204

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Synopsis

The remote Red Hat host is missing a security update for libvirt.

Description

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2014:0560 advisory.

The libvirt library is a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems. In addition, libvirt provides tools for remote management of virtualized systems.

It was found that libvirt passes the XML_PARSE_NOENT flag when parsing XML documents using the libxml2 library, in which case all XML entities in the parsed documents are expanded. A user able to force libvirtd to parse an XML document with an entity pointing to a special file that blocks on read access could use this flaw to cause libvirtd to hang indefinitely, resulting in a denial of service on the system. (CVE-2014-0179)

Red Hat would like to thank the upstream Libvirt project for reporting this issue. Upstream acknowledges Daniel P. Berrange and Richard Jones as the original reporters.

This update also fixes the following bugs:

* When hot unplugging a virtual CPU (vCPU), libvirt kept a pointer to already freed memory if the vCPU was pinned to a host CPU. Consequently, when reading the CPU pinning information, libvirt terminated unexpectedly due to an attempt to access this memory. This update ensures that libvirt releases the pointer to the previously allocated memory when a vCPU is being hot unplugged, and it no longer crashes in this situation.
(BZ#1091206)

* Previously, libvirt passed an incorrect argument to the tc command when setting quality of service (QoS) on a network interface controller (NIC).
As a consequence, QoS was applied only to IP traffic. With this update, libvirt constructs the tc command correctly so that QoS is applied to all traffic as expected. (BZ#1096806)

* When using the sanlock daemon for managing access to shared storage, libvirt expected all QEMU domains to be registered with sanlock. However, if a QEMU domain was started prior to enabling sanlock, the domain was not registered with sanlock. Consequently, migration of a virtual machine (VM) from such a QEMU domain failed with a libvirt error. With this update, libvirt verifies whether a QEMU domain process is registered with sanlock before it starts working with the domain, ensuring that migration of virtual machines works as expected. (BZ#1097227)

All libvirt users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the updated packages, libvirtd will be restarted automatically.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL libvirt package based on the guidance in RHSA-2014:0560.

Plugin Details

Severity: Critical

ID: 74204

File Name: redhat-RHSA-2014-0560.nasl

Version: 1.16

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 5/28/2014

Updated: 11/4/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Low

Base Score: 1.9

Temporal Score: 1.4

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

CVSS Score Source: CVE-2014-0179

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:libvirt-python, p-cpe:/a:redhat:enterprise_linux:libvirt-devel, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:libvirt-client, p-cpe:/a:redhat:enterprise_linux:libvirt, p-cpe:/a:redhat:enterprise_linux:libvirt-lock-sanlock

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: 5/27/2014

Vulnerability Publication Date: 8/3/2014

Reference Information

CVE: CVE-2014-0179

BID: 67289

CWE: 611

RHSA: 2014:0560

Detections

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