[RHSA-2009:0003-01] Moderate: xen security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Moderate: xen security and bug fix update

Advisory ID: RHSA-2009:0003-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-0003.html

Issue date: 2009-01-07

CVE Names: CVE-2008-4405 CVE-2008-4993

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1. Summary:

 

Updated xen packages that resolve several security issues and a bug 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:

 

The xen packages contain the Xen tools and management daemons needed to

manage virtual machines running on Red Hat Enterprise Linux.

 

Xen was found to allow unprivileged DomU domains to overwrite xenstore

values which should only be changeable by the privileged Dom0 domain. An

attacker controlling a DomU domain could, potentially, use this flaw to

kill arbitrary processes in Dom0 or trick a Dom0 user into accessing the

text console of a different domain running on the same host. This update

makes certain parts of the xenstore tree read-only to the unprivileged DomU

domains. (CVE-2008-4405)

 

It was discovered that the qemu-dm.debug script created a temporary file in

/tmp in an insecure way. A local attacker in Dom0 could, potentially, use

this flaw to overwrite arbitrary files via a symlink attack. Note: This

script is not needed in production deployments and therefore was removed

and is not shipped with updated xen packages. (CVE-2008-4993)

 

This update also fixes the following bug:

 

* xen calculates its running time by adding the hypervisor's up-time to the

hypervisor's boot-time record. In live migrations of para-virtualized

guests, however, the guest would over-write the new hypervisor's boot-time

record with the boot-time of the previous hypervisor. This caused

time-dependent processes on the guests to fail (for example, crond would

fail to start cron jobs). With this update, the new hypervisor's boot-time

record is no longer over-written during live migrations.

 

All xen users are advised to upgrade to these updated packages, which

contain backported patches to resolve these issues. The Xen host must be

restarted for the 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/):

 

464455 - timer stops running after live migrate or dom0 reboot & save/restore of a Xen guest

464817 - CVE-2008-4405 xen: Multiple unsafe uses of guest-writable data from xenstore

470795 - CVE-2008-4993 xen: insecure temporary file use in qemu-dm.debug

 

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-3.0.3-64.el5_2.9.src.rpm

 

i386:

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-libs-3.0.3-64.el5_2.9.i386.rpm

 

x86_64:

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm

xen-libs-3.0.3-64.el5_2.9.i386.rpm

xen-libs-3.0.3-64.el5_2.9.x86_64.rpm

 

RHEL Desktop Multi OS (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xen-3.0.3-64.el5_2.9.src.rpm

 

i386:

xen-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-devel-3.0.3-64.el5_2.9.i386.rpm

 

x86_64:

xen-3.0.3-64.el5_2.9.x86_64.rpm

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm

xen-devel-3.0.3-64.el5_2.9.i386.rpm

xen-devel-3.0.3-64.el5_2.9.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-64.el5_2.9.src.rpm

 

i386:

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-libs-3.0.3-64.el5_2.9.i386.rpm

 

ia64:

xen-debuginfo-3.0.3-64.el5_2.9.ia64.rpm

xen-libs-3.0.3-64.el5_2.9.ia64.rpm

 

x86_64:

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm

xen-libs-3.0.3-64.el5_2.9.i386.rpm

xen-libs-3.0.3-64.el5_2.9.x86_64.rpm

 

RHEL Virtualization (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-64.el5_2.9.src.rpm

 

i386:

xen-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-devel-3.0.3-64.el5_2.9.i386.rpm

 

ia64:

xen-3.0.3-64.el5_2.9.ia64.rpm

xen-debuginfo-3.0.3-64.el5_2.9.ia64.rpm

xen-devel-3.0.3-64.el5_2.9.ia64.rpm

 

x86_64:

xen-3.0.3-64.el5_2.9.x86_64.rpm

xen-debuginfo-3.0.3-64.el5_2.9.i386.rpm

xen-debuginfo-3.0.3-64.el5_2.9.x86_64.rpm

xen-devel-3.0.3-64.el5_2.9.i386.rpm

xen-devel-3.0.3-64.el5_2.9.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-2008-4405

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4993

http://www.redhat.com/security/updates/classification/#moderate

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://www.redhat.com/security/team/contact/

 

Copyright 2009 Red Hat, Inc.

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