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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: xen security update
Advisory ID:       RHSA-2011:0496-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-0496.html
Issue date:        2011-05-09
CVE Names:         CVE-2011-1583 
=====================================================================

1. Summary:

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

The Red Hat Security Response Team 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.

It was found that the xc_try_bzip2_decode() and xc_try_lzma_decode() decode
routines did not correctly check for a possible buffer size overflow in the
decoding loop. As well, several integer overflow flaws and missing
error/range checking were found that could lead to an infinite loop. A
privileged guest user could use these flaws to crash the guest or,
possibly, execute arbitrary code in the privileged management domain
(Dom0). (CVE-2011-1583)

All xen users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted 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.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

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

696927 - CVE-2011-1583 xen: insufficiencies in pv kernel image validation

6. Package List:

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

Source:
xen-3.0.3-120.el5_6.2.src.rpm

i386:
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-libs-3.0.3-120.el5_6.2.i386.rpm

x86_64:
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm
xen-libs-3.0.3-120.el5_6.2.i386.rpm
xen-libs-3.0.3-120.el5_6.2.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
xen-3.0.3-120.el5_6.2.src.rpm

i386:
xen-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-devel-3.0.3-120.el5_6.2.i386.rpm

x86_64:
xen-3.0.3-120.el5_6.2.x86_64.rpm
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm
xen-devel-3.0.3-120.el5_6.2.i386.rpm
xen-devel-3.0.3-120.el5_6.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
xen-3.0.3-120.el5_6.2.src.rpm

i386:
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-libs-3.0.3-120.el5_6.2.i386.rpm

ia64:
xen-debuginfo-3.0.3-120.el5_6.2.ia64.rpm
xen-libs-3.0.3-120.el5_6.2.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm
xen-libs-3.0.3-120.el5_6.2.i386.rpm
xen-libs-3.0.3-120.el5_6.2.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
xen-3.0.3-120.el5_6.2.src.rpm

i386:
xen-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-devel-3.0.3-120.el5_6.2.i386.rpm

ia64:
xen-3.0.3-120.el5_6.2.ia64.rpm
xen-debuginfo-3.0.3-120.el5_6.2.ia64.rpm
xen-devel-3.0.3-120.el5_6.2.ia64.rpm

x86_64:
xen-3.0.3-120.el5_6.2.x86_64.rpm
xen-debuginfo-3.0.3-120.el5_6.2.i386.rpm
xen-debuginfo-3.0.3-120.el5_6.2.x86_64.rpm
xen-devel-3.0.3-120.el5_6.2.i386.rpm
xen-devel-3.0.3-120.el5_6.2.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/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2011-1583.html
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 2011 Red Hat, Inc.
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