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RedHat: Important: xen security and bug fix update Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
RedHat Linux Daniel P. Berrange discovered that the hypervisor's para-virtualized framebuffer (PVFB) backend failed to validate the format of messages serving to update the contents of the framebuffer. This could allow a malicious user to cause a denial of service, or compromise the privileged domain (Dom0). (CVE-2008-1944)
=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: xen security and bug fix update
Advisory ID:       RHSA-2008:0194-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0194.html
Issue date:        2008-05-13
CVE Names:         CVE-2007-3919 CVE-2007-5730 CVE-2008-0928 
                   CVE-2008-1943 CVE-2008-1944 CVE-2008-2004 
=====================================================================

1. Summary:

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

This update has been rated as having important 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 tools for managing the virtual machine monitor in
Red Hat Virtualization.

These updated packages fix the following security issues:

Daniel P. Berrange discovered that the hypervisor's para-virtualized
framebuffer (PVFB) backend failed to validate the format of messages
serving to update the contents of the framebuffer. This could allow a
malicious user to cause a denial of service, or compromise the privileged
domain (Dom0). (CVE-2008-1944)

Markus Armbruster discovered that the hypervisor's para-virtualized
framebuffer (PVFB) backend failed to validate the frontend's framebuffer
description. This could allow a malicious user to cause a denial of
service, or to use a specially crafted frontend to compromise the
privileged domain (Dom0). (CVE-2008-1943)

Chris Wright discovered a security vulnerability in the QEMU block format
auto-detection, when running fully-virtualized guests. Such
fully-virtualized guests, with a raw formatted disk image, were able
to write a header to that disk image describing another format. This could
allow such guests to read arbitrary files in their hypervisor's host.
(CVE-2008-2004)

Ian Jackson discovered a security vulnerability in the QEMU block device
drivers backend. A guest operating system could issue a block device
request and read or write arbitrary memory locations, which could lead to
privilege escalation. (CVE-2008-0928)

Tavis Ormandy found that QEMU did not perform adequate sanity-checking of
data received via the "net socket listen" option. A malicious local
administrator of a guest domain could trigger this flaw to potentially
execute arbitrary code outside of the domain. (CVE-2007-5730)

Steve Kemp discovered that the xenbaked daemon and the XenMon utility
communicated via an insecure temporary file. A malicious local
administrator of a guest domain could perform a symbolic link attack,
causing arbitrary files to be truncated. (CVE-2007-3919)

As well, in the previous xen packages, it was possible for Dom0 to fail to
flush data from a fully-virtualized guest to disk, even if the guest
explicitly requested the flush. This could cause data integrity problems on
the guest. In these updated packages, Dom0 always respects the request to
flush to disk.

Users of xen are advised to upgrade to these updated packages, which
resolve these issues.

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/FAQ_58_10188

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

350421 - CVE-2007-3919 xen xenmon.py / xenbaked insecure temporary file accesss
360381 - CVE-2007-5730 QEMU Buffer overflow via crafted "net socket listen" option
433560 - CVE-2008-0928 Qemu insufficient block device address range checking
435495 - [RHEL5.2]: LTC41676-Xen full virt has data integrity issue
443078 - CVE-2008-1943 PVFB backend fails to validate frontend's framebuffer description
443390 - CVE-2008-1944 PVFB SDL backend chokes on bogus screen updates
444583 - CVE-2008-2004 qemu/kvm/xen: qemu block format auto-detection 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-3.0.3-41.el5_1.5.src.rpm

i386:
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-libs-3.0.3-41.el5_1.5.i386.rpm

x86_64:
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.x86_64.rpm
xen-libs-3.0.3-41.el5_1.5.i386.rpm
xen-libs-3.0.3-41.el5_1.5.x86_64.rpm

RHEL Desktop Multi OS (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/xen-3.0.3-41.el5_1.5.src.rpm

i386:
xen-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-devel-3.0.3-41.el5_1.5.i386.rpm

x86_64:
xen-3.0.3-41.el5_1.5.x86_64.rpm
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.x86_64.rpm
xen-devel-3.0.3-41.el5_1.5.i386.rpm
xen-devel-3.0.3-41.el5_1.5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-41.el5_1.5.src.rpm

i386:
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-libs-3.0.3-41.el5_1.5.i386.rpm

ia64:
xen-debuginfo-3.0.3-41.el5_1.5.ia64.rpm
xen-libs-3.0.3-41.el5_1.5.ia64.rpm

x86_64:
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.x86_64.rpm
xen-libs-3.0.3-41.el5_1.5.i386.rpm
xen-libs-3.0.3-41.el5_1.5.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-41.el5_1.5.src.rpm

i386:
xen-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-devel-3.0.3-41.el5_1.5.i386.rpm

ia64:
xen-3.0.3-41.el5_1.5.ia64.rpm
xen-debuginfo-3.0.3-41.el5_1.5.ia64.rpm
xen-devel-3.0.3-41.el5_1.5.ia64.rpm

x86_64:
xen-3.0.3-41.el5_1.5.x86_64.rpm
xen-debuginfo-3.0.3-41.el5_1.5.i386.rpm
xen-debuginfo-3.0.3-41.el5_1.5.x86_64.rpm
xen-devel-3.0.3-41.el5_1.5.i386.rpm
xen-devel-3.0.3-41.el5_1.5.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3919
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5730
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0928
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1943
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1944
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2004
http://www.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2008 Red Hat, Inc.
 
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