Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

               New kvm packages fix several vulnerabilities
                             24 December 2009


        AusCERT Security Bulletin Summary

Product:           kvm
Publisher:         Debian
Operating System:  Debian GNU/Linux 5
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-4031 CVE-2009-3722 CVE-2009-3638

Reference:         ESB-2009.1621

Original Bulletin: 

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

- - ------------------------------------------------------------------------
Debian Security Advisory DSA-1962                  security@debian.org
http://www.debian.org/security/                      Giuseppe Iuculano
December 23, 2009                   http://www.debian.org/security/faq
- - ------------------------------------------------------------------------

Package        : kvm
Vulnerability  : several vulnerabilities
Problem type   : local
Debian-specific: no
Debian bugs    : 557739 562075 562076
CVE Ids        : CVE-2009-3638 CVE-2009-3722 CVE-2009-4031

Several vulnerabilities have been discovered in kvm, a full virtualization system.
The Common Vulnerabilities and Exposures project identifies the
following problems:


It was discovered an Integer overflow in the kvm_dev_ioctl_get_supported_cpuid
function. This allows local users to have an unspecified impact via a
KVM_GET_SUPPORTED_CPUID request to the kvm_arch_dev_ioctl function.


It was discovered that the handle_dr function in the KVM subsystem does not
properly verify the Current Privilege Level (CPL) before accessing a debug
register, which allows guest OS users to cause a denial of service (trap) on the
host OS via a crafted application.


It was discovered that the do_insn_fetch function in the x86 emulator in the KVM
subsystem tries to interpret instructions that contain too many bytes to be
valid, which allows guest OS users to cause a denial of service (increased
scheduling latency) on the host OS via unspecified manipulations related to SMP

For the stable distribution (lenny), these problems have been fixed in version

For the testing distribution (squeeze), and the unstable distribution (sid),
these problems will be fixed soon.

We recommend that you upgrade your kvm package.

Upgrade instructions
- - --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 5.0 alias lenny
- - --------------------------------

Debian (stable)
- - ---------------

Stable updates are available for alpha, amd64, arm, armel, hppa, i386, ia64,
mips, mipsel, powerpc, s390 and sparc.

Source archives:

    Size/MD5 checksum:  3250251 899a66ae2ea94e994e06f637e1afef4a
    Size/MD5 checksum:    42354 12a3490ebcba2c1e9aa2a86140eaa2e3
    Size/MD5 checksum:     1349 95ea1b5511954549694e198b838e308c

Architecture independent packages:

    Size/MD5 checksum:   158524 70f46f694afd3169ce16a4c84ee32eb6

amd64 architecture (AMD x86_64 (AMD64))

    Size/MD5 checksum:  1105892 22f218058f3cc3f8d40ca9069ff151f9

i386 architecture (Intel ia32)

    Size/MD5 checksum:  1030580 ffdfcfce508514828bf455183e45f581

  These files will probably be moved into the stable distribution on
  its next update.

- - ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
Version: GnuPG v1.4.10 (GNU/Linux)


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Australian Computer Emergency Response Team
The University of Queensland
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967