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ESB-2009.1393 - [Debian] kvm: Multiple vulnerabilities

Date: 14 October 2009
References: ESB-2009.0056  ESB-2009.1354  ESB-2009.1438  

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1393
               New kvm packages fix several vulnerabilities
                              14 October 2009

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kvm
Publisher:         Debian
Operating System:  Debian GNU/Linux 5
Impact/Access:     Reduced Security  -- Remote/Unauthenticated
                   Denial of Service -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3290 CVE-2008-5714 

Reference:         ESB-2009.1354
                   ESB-2009.0056

Original Bulletin: 
   http://www.debian.org/security/2009/dsa-1907

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- - ------------------------------------------------------------------------
Debian Security Advisory DSA-1907-1                  security@debian.org
http://www.debian.org/security/                      Giuseppe Iuculano
October 13, 2009                      http://www.debian.org/security/faq
- - ------------------------------------------------------------------------

Package        : kvm
Vulnerability  : several vulnerabilities
Problem type   : local (remote)
Debian-specific: no
Debian bugs    : 509997 548975
CVE Ids        : CVE-2008-5714 CVE-2009-3290


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

CVE-2008-5714

Chris Webb discovered an off-by-one bug limiting KVM's VNC passwords to 7
characters. This flaw might make it easier for remote attackers to guess the VNC
password, which is limited to seven characters where eight was intended.

CVE-2009-3290

It was discovered that the kvm_emulate_hypercall function in KVM does not
prevent access to MMU hypercalls from ring 0, which allows local guest OS users
to cause a denial of service (guest kernel crash) and read or write guest kernel
memory.


For the stable distribution (lenny), these problems have been fixed in version
72+dfsg-5~lenny3.

The oldstable distribution (etch) does not contain kvm.

For the testing distribution (squeeze) these problems will be fixed soon.

For the unstable distribution (sid) these problems have been fixed in version
85+dfsg-4.1


We recommend that you upgrade your kvm packages.

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:

  http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny3.dsc
    Size/MD5 checksum:     1349 da207d5f42ab45ed3956be5fcb6ad685
  http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny3.diff.gz
    Size/MD5 checksum:    41138 f28b640e60392636399873e99b6cc5e3
  http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg.orig.tar.gz
    Size/MD5 checksum:  3250251 899a66ae2ea94e994e06f637e1afef4a

Architecture independent packages:

  http://security.debian.org/pool/updates/main/k/kvm/kvm-source_72+dfsg-5~lenny3_all.deb
    Size/MD5 checksum:   158242 8cee5a68dadbbceecdac6330b69fa59f

amd64 architecture (AMD x86_64 (AMD64))

  http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny3_amd64.deb
    Size/MD5 checksum:  1099546 5009415dc4927800b33249ca31d8a651

i386 architecture (Intel ia32)

  http://security.debian.org/pool/updates/main/k/kvm/kvm_72+dfsg-5~lenny3_i386.deb
    Size/MD5 checksum:  1030530 313f1a0d91889bf167c4e1aaf57a027d


  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>
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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