Articles / Red Hat: Updated xen packag…

Red Hat: Updated xen packages fix a security issue

Xen is an open source virtualization framework. Virtualization allows users to run guest operating systems in virtual machines on top of a host operating system. The pyGrub boot loader did not honor the “password” option in the grub.conf file for para-virtualized guests. Users with access to a guest’s console could use this flaw to bypass intended access restrictions and boot the guest with arbitrary kernel boot options, allowing them to get root privileges in the guest’s operating system. With this update, pyGrub correctly honors the “password” option in grub.conf for para-virtualized guests. Updated packages are available from updates.redhat.com.

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

Synopsis:          Moderate: xen security and bug fix update
Advisory ID:       RHSA-2009:1472-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1472.html
Issue date:        2009-10-01
CVE Names:         CVE-2009-3525 
=====================================================================

1. Summary:

Updated xen packages that fix a security issue and multiple bugs are now
available for Red Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

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

3. Description:

Xen is an open source virtualization framework. Virtualization allows users
to run guest operating systems in virtual machines on top of a host
operating system.

The pyGrub boot loader did not honor the "password" option in the grub.conf
file for para-virtualized guests. Users with access to a guest's console
could use this flaw to bypass intended access restrictions and boot the
guest with arbitrary kernel boot options, allowing them to get root
privileges in the guest's operating system. With this update, pyGrub
correctly honors the "password" option in grub.conf for para-virtualized
guests. (CVE-2009-3525)

This update also fixes the following bugs:

* rebooting para-virtualized guests sometimes caused those guests to crash
due to a race condition in the xend node control daemon. This update fixes
this race condition so that rebooting guests no longer potentially causes
them to crash and fail to reboot. (BZ#525141)

* due to a race condition in the xend daemon, a guest could disappear from
the list of running guests following a reboot, even though the guest
rebooted successfully and was running. This update fixes this race
condition so that guests always reappear in the guest list following a
reboot. (BZ#525143)

* attempting to use PCI pass-through to para-virtualized guests on certain
kernels failed with a "Function not implemented" error message. As a
result, users requiring PCI pass-through on para-virtualized guests were
not able to update the xen packages without also updating the kernel and
thus requiring a reboot. These updated packages enable PCI pass-through for
para-virtualized guests so that users do not need to upgrade the kernel in
order to take advantage of PCI pass-through functionality. (BZ#525149)

All Xen users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the xend service must be restarted for this update to take
effect.

4. Solution:

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

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

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

525141 - [REG][Xen][5.4] PV domains may crash after reboot
525142 - Add grub.conf password protection support to pygrub
525143 - Domain goes missing from xm list when rebooted
525149 - PCI-Paththrough with PCI-Card does not work anymore with RHEL5.4
525740 - CVE-2009-3525 Xen: PyGrub missing support for password configuration command

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-3.0.3-94.el5_4.1.src.rpm

i386:
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-libs-3.0.3-94.el5_4.1.i386.rpm

x86_64:
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.x86_64.rpm
xen-libs-3.0.3-94.el5_4.1.i386.rpm
xen-libs-3.0.3-94.el5_4.1.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xen-3.0.3-94.el5_4.1.src.rpm

i386:
xen-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-devel-3.0.3-94.el5_4.1.i386.rpm

x86_64:
xen-3.0.3-94.el5_4.1.x86_64.rpm
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.x86_64.rpm
xen-devel-3.0.3-94.el5_4.1.i386.rpm
xen-devel-3.0.3-94.el5_4.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-94.el5_4.1.src.rpm

i386:
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-libs-3.0.3-94.el5_4.1.i386.rpm

ia64:
xen-debuginfo-3.0.3-94.el5_4.1.ia64.rpm
xen-libs-3.0.3-94.el5_4.1.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.x86_64.rpm
xen-libs-3.0.3-94.el5_4.1.i386.rpm
xen-libs-3.0.3-94.el5_4.1.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-94.el5_4.1.src.rpm

i386:
xen-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-devel-3.0.3-94.el5_4.1.i386.rpm

ia64:
xen-3.0.3-94.el5_4.1.ia64.rpm
xen-debuginfo-3.0.3-94.el5_4.1.ia64.rpm
xen-devel-3.0.3-94.el5_4.1.ia64.rpm

x86_64:
xen-3.0.3-94.el5_4.1.x86_64.rpm
xen-debuginfo-3.0.3-94.el5_4.1.i386.rpm
xen-debuginfo-3.0.3-94.el5_4.1.x86_64.rpm
xen-devel-3.0.3-94.el5_4.1.i386.rpm
xen-devel-3.0.3-94.el5_4.1.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3525
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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