Detections
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CentOS 5 : xen (CESA-2008:0892)
medium Nessus Plugin ID 43711
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Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated xen packages that resolve a couple of security issues and fix a bug are now available for Red Hat Enterprise Linux 5.This update has been rated as having important security impact by the Red Hat Security Response Team.
The xen packages contain tools for managing the virtual machine monitor in Red Hat Virtualization.
It was discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the frontend's framebuffer description properly. This could allow a privileged user in the unprivileged domain (DomU) to cause a denial of service, or, possibly, elevate privileges to the privileged domain (Dom0). (CVE-2008-1952)
A flaw was found in the QEMU block format auto-detection, when running fully-virtualized guests and using Qemu images written on removable media (USB storage, 3.5' disks). Privileged users of such fully-virtualized guests (DomU), with a raw-formatted disk image, were able to write a header to that disk image describing another format.
This could allow such guests to read arbitrary files in their hypervisor's host (Dom0). (CVE-2008-1945)
Additionally, the following bug is addressed in this update :
* The qcow-create command terminated when invoked due to glibc bounds checking on the realpath() function.
Users of xen are advised to upgrade to these updated packages, which resolve these security issues and fix this bug.
Solution
Update the affected xen packages.See Also
Plugin Details
Severity: Medium
ID: 43711
File Name: centos_RHSA-2008-0892.nasl
Version: 1.15
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 1/6/2010
Updated: 1/4/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.7
CVSS v2
Risk Factor: Medium
Base Score: 4.9
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N
Vulnerability Information
CPE: p-cpe:/a:centos:centos:xen-libs, p-cpe:/a:centos:centos:xen-devel, cpe:/o:centos:centos:5, p-cpe:/a:centos:centos:xen
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Patch Publication Date: 10/5/2008
Vulnerability Publication Date: 6/23/2008
Reference Information
CVE: CVE-2008-1945, CVE-2008-1952