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Red Hat Security Advisory

Synopsis: Important: xen security update
Advisory ID: RHSA-2015:1002-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1002.html
Issue date: 2015-05-13
CVE Names: CVE-2015-3456
=====================================================================

1. Summary:

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.

2. Relevant releases/architectures:

RHEL Desktop Multi OS (v. 5 client) – i386, x86_64
RHEL Virtualization (v. 5 server) – i386, ia64, x86_64
Red Hat Enterprise Linux (v. 5 server) – i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) – i386, x86_64

3. Description:

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.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1218611 – CVE-2015-3456 qemu: fdc: out-of-bounds fifo buffer memory access

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm

x86_64:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm

x86_64:
xen-3.0.3-146.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm

ia64:
xen-debuginfo-3.0.3-146.el5_11.ia64.rpm
xen-libs-3.0.3-146.el5_11.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-libs-3.0.3-146.el5_11.i386.rpm
xen-libs-3.0.3-146.el5_11.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
xen-3.0.3-146.el5_11.src.rpm

i386:
xen-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm

ia64:
xen-3.0.3-146.el5_11.ia64.rpm
xen-debuginfo-3.0.3-146.el5_11.ia64.rpm
xen-devel-3.0.3-146.el5_11.ia64.rpm

x86_64:
xen-3.0.3-146.el5_11.x86_64.rpm
xen-debuginfo-3.0.3-146.el5_11.i386.rpm
xen-debuginfo-3.0.3-146.el5_11.x86_64.rpm
xen-devel-3.0.3-146.el5_11.i386.rpm
xen-devel-3.0.3-146.el5_11.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-3456
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2015 Red Hat, Inc.
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