CentOS 5 : xen (CESA-2015:1002) (Venom)

High Nessus Plugin ID 83420


The remote CentOS host is missing one or more security updates.


Updated xen packages that fix one security issue are now available for Red Hat Enterprise Linux 5.

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.

The xen packages contain administration tools and the xend service for managing the kernel-xen kernel for virtualization on Red Hat Enterprise Linux.

An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller (FDC) handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest. (CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting this issue.

All xen users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing the updated packages, all running fully-virtualized guests must be restarted for this update to take effect.


Update the affected xen packages.

See Also


Plugin Details

Severity: High

ID: 83420

File Name: centos_RHSA-2015-1002.nasl

Version: $Revision: 2.10 $

Type: local

Agent: unix

Published: 2015/05/13

Modified: 2015/10/23

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 7.7

Temporal Score: 6

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:ND

Vulnerability Information

CPE: p-cpe:/a:centos:centos:xen, p-cpe:/a:centos:centos:xen-devel, p-cpe:/a:centos:centos:xen-libs, cpe:/o:centos:centos:5

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2015/05/13

Exploitable With

Core Impact

Reference Information

CVE: CVE-2015-3456

OSVDB: 122072

RHSA: 2015:1002

IAVA: 2015-A-0115