RHEL 5 : libvirt (RHSA-2011:1019)

critical Nessus Plugin ID 63993

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Synopsis

The remote Red Hat host is missing a security update.

Description

The remote Redhat Enterprise Linux 5 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2011:1019 advisory.

The libvirt library is a C API for managing and interacting with the virtualization capabilities of Linux and other operating systems.

An integer overflow flaw was found in libvirtd's RPC call handling. An attacker able to establish read-only connections to libvirtd could trigger this flaw by calling virDomainGetVcpus() with specially-crafted parameters, causing libvirtd to crash. (CVE-2011-2511)

This update fixes the following bugs:

* libvirt was rebased from version 0.6.3 to version 0.8.2 in Red Hat Enterprise Linux 5.6. A code audit found a minor API change that effected error messages seen by libvirt 0.8.2 clients talking to libvirt 0.7.1 0.7.7 (0.7.x) servers. A libvirt 0.7.x server could send VIR_ERR_BUILD_FIREWALL errors where a libvirt 0.8.2 client expected VIR_ERR_CONFIG_UNSUPPORTED errors. In other circumstances, a libvirt 0.8.2 client saw a Timed out during operation message where it should see an Invalid network filter error. This update adds a backported patch that allows libvirt 0.8.2 clients to interoperate with the API as used by libvirt 0.7.x servers, ensuring correct error messages are sent.
(BZ#665075)

* libvirt could crash if the maximum number of open file descriptors (_SC_OPEN_MAX) grew larger than the FD_SETSIZE value because it accessed file descriptors outside the bounds of the set. With this update the maximum number of open file descriptors can no longer grow larger than the FD_SETSIZE value. (BZ#665549)

* A libvirt race condition was found. An array in the libvirt event handlers was accessed with a lock temporarily released. In rare cases, if one thread attempted to access this array but a second thread reallocated the array before the first thread reacquired a lock, it could lead to the first thread attempting to access freed memory, potentially causing libvirt to crash. With this update libvirt no longer refers to the old array and, consequently, behaves as expected. (BZ#671569)

* Guests connected to a passthrough NIC would kernel panic if a system_reset signal was sent through the QEMU monitor. With this update you can reset such guests as expected. (BZ#689880)

* When using the Xen kernel, the rpmbuild command failed on the xencapstest test. With this update you can run rpmbuild successfully when using the Xen kernel. (BZ#690459)

* When a disk was hot unplugged, ret >= 0 was passed to the qemuAuditDisk calls in disk hotunplug operations before ret was, in fact, set to 0. As well, the error path jumped to the cleanup label prematurely. As a consequence, hotunplug failures were not audited and hotunplug successes were audited as failures. This was corrected and hot unplugging checks now behave as expected. (BZ#710151)

* A conflict existed between filter update locking sequences and virtual machine startup locking sequences. When a filter update occurred on one or more virtual machines, a deadlock could consequently occur if a virtual machine referencing a filter was started. This update changes and makes more flexible several qemu locking sequences ensuring this deadlock no longer occurs. (BZ#697749)

* qemudDomainSaveImageStartVM closed some incoming file descriptor (fd) arguments without informing the caller. The consequent double-closes could cause Domain restoration failure. This update alters the qemudDomainSaveImageStartVM signature to prevent the double-closes.
(BZ#681623)

This update also adds the following enhancements:

* The libvirt Xen driver now supports more than one serial port.
(BZ#670789)

* Enabling and disabling the High Precision Event Timer (HPET) in Xen domains is now possible. (BZ#703193)

All libvirt users should install this update which addresses this vulnerability, fixes these bugs and adds these enhancements. After installing the updated packages, libvirtd must be restarted (service libvirtd restart) for this update to take effect.

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 affected libvirt, libvirt-devel and / or libvirt-python packages.

Plugin Details

Severity: Critical

ID: 63993

File Name: redhat-RHSA-2011-1019.nasl

Version: 1.20

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 1/24/2013

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: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2011-2511

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, p-cpe:/a:redhat:enterprise_linux:libvirt-python, cpe:/o:redhat:enterprise_linux:5, p-cpe:/a:redhat:enterprise_linux:libvirt-devel

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: 7/21/2011

Vulnerability Publication Date: 8/10/2011

Reference Information

CVE: CVE-2011-2511

BID: 48478

CWE: 190

RHSA: 2011:1019

Detections

Analytics