Articles / Red Hat: Security update fo…

Red Hat: Security update for xen

The xen packages contain administration tools and the xend service for managing the kernel-xen kernel for virtualization on Red Hat Enterprise Linux. A flaw was found in the way QEMU handled VT100 terminal escape sequences when emulating certain character devices. A guest user with privileges to write to a character device that is emulated on the host using a virtual console back-end could use this flaw to crash the qemu process on the host or, possibly, escalate their privileges on the host.

Updated packages are available from ftp.redhat.com.

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

Synopsis:          Important: xen security update
Advisory ID:       RHSA-2012:1236-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1236.html
Issue date:        2012-09-05
CVE Names:         CVE-2012-3515 
=====================================================================

1. Summary:

Updated xen packages that fix one security issue 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.

A flaw was found in the way QEMU handled VT100 terminal escape sequences
when emulating certain character devices. A guest user with privileges to
write to a character device that is emulated on the host using a virtual
console back-end could use this flaw to crash the qemu process on the
host or, possibly, escalate their privileges on the host. (CVE-2012-3515)

This flaw did not affect the default use of the Xen hypervisor
implementation in Red Hat Enterprise Linux 5. This problem only affected
fully-virtualized guests that have a serial or parallel device that uses a
virtual console (vc) back-end. By default, the virtual console back-end is
not used for such devices; only guests explicitly configured to use them
in this way were affected.

Red Hat would like to thank the Xen project for reporting this issue.

All users of xen are advised to upgrade to these updated packages, which
correct this issue. After installing the updated packages, all
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.

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/knowledge/articles/11258

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

851252 - CVE-2012-3515 qemu: VT100 emulation vulnerability

6. Package List:

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xen-3.0.3-135.el5_8.5.src.rpm

i386:
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-libs-3.0.3-135.el5_8.5.i386.rpm

x86_64:
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.x86_64.rpm
xen-libs-3.0.3-135.el5_8.5.i386.rpm
xen-libs-3.0.3-135.el5_8.5.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xen-3.0.3-135.el5_8.5.src.rpm

i386:
xen-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-devel-3.0.3-135.el5_8.5.i386.rpm

x86_64:
xen-3.0.3-135.el5_8.5.x86_64.rpm
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.x86_64.rpm
xen-devel-3.0.3-135.el5_8.5.i386.rpm
xen-devel-3.0.3-135.el5_8.5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-135.el5_8.5.src.rpm

i386:
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-libs-3.0.3-135.el5_8.5.i386.rpm

ia64:
xen-debuginfo-3.0.3-135.el5_8.5.ia64.rpm
xen-libs-3.0.3-135.el5_8.5.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.x86_64.rpm
xen-libs-3.0.3-135.el5_8.5.i386.rpm
xen-libs-3.0.3-135.el5_8.5.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-135.el5_8.5.src.rpm

i386:
xen-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-devel-3.0.3-135.el5_8.5.i386.rpm

ia64:
xen-3.0.3-135.el5_8.5.ia64.rpm
xen-debuginfo-3.0.3-135.el5_8.5.ia64.rpm
xen-devel-3.0.3-135.el5_8.5.ia64.rpm

x86_64:
xen-3.0.3-135.el5_8.5.x86_64.rpm
xen-debuginfo-3.0.3-135.el5_8.5.i386.rpm
xen-debuginfo-3.0.3-135.el5_8.5.x86_64.rpm
xen-devel-3.0.3-135.el5_8.5.i386.rpm
xen-devel-3.0.3-135.el5_8.5.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-2012-3515.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 2012 Red Hat, Inc.
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